This standard specifies the terminology, technical requirements, inspection, marking, packaging, transportation and storage of thyristor electric control equipment for DC drive mine hoists. This standard applies to control equipment for DC motors powered by thyristors in friction and winding mine hoists (hereinafter referred to as equipment). This standard does not apply to equipment with explosion-proof requirements or hoisting signal equipment. JB/T 6754.2-1993 DC drive mine hoist electric control equipment Part 2 Thyristor electric control equipment JB/T6754.2-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Electrical Control Equipment for DC Drive Mine Hoists
Part 2
Thyristor Electronic Control Equipment
1 Subject Content and Scope of Application
JB/T 6754.2—1993
This standard specifies the terminology, technical requirements, inspection, marking, packaging, transportation and storage of thyristor electronic control equipment for DC drive mine hoists.
This standard applies to control equipment for DC motors powered by thyristors in friction and winding mine hoists (hereinafter referred to as equipment).
This standard does not apply to equipment with explosion-proof requirements or hoisting signal equipment. 2 Reference standards
GB2681
Colors of wires in electrical complete sets
Colors of indicator lights and buttons in electrical complete setsGB2682
GB3047.1 Basic dimension series for panels, racks and cabinetsGB3797
Electrical control equipment Part 2 Electrical control equipment with electronic devicesSemiconductor power converters
GB3859
Thyristor power converters for DC motor speed regulationGB3886
GB3906
AC metal-enclosed switchgear||t t||GB4205
GB4208
Standard operating parts for controlling electrical equipmentMotion directionClassification of enclosure protection levels
GB4588.1~4588.2Technical conditions for printed boardsGB4720
JB3752
3Terms
Electrical control equipmentPart 1Electrical control equipment equipped with low-voltage electrical appliancesProduct model compilation method for electrical control equipment
3.1 Thyristor electronic control equipment (referred to as equipment)The equipment referred to in this standard consists of thyristor converter equipment, lifting control equipment and high and low voltage switch equipment. 3.2 Thyristor converter equipment
Thyristor converter equipment consists of thyristor converter devices and their regulating and controlling devices together with converter transformers, reactors and DC fast switches. 3.3Speed ​​diagram
The relationship curve between lifting speed and time determined by the lifting process. 3.4 Force diagram
When the speed diagram of a certain lifting process is met, the relationship curve between the circumferential force borne by the roller or the load torque converted to the motor shaft by this force and time.
3.5 Safety brake
When an abnormal phenomenon occurs in the lifting system and an emergency stop is required, a device that can apply emergency braking according to a predetermined procedure. 3.6 Working brake
Approved by the Ministry of Machinery Industry on August 21, 1993
Implemented on October 1, 1993
Braking device used for normal operation control of the hoist. 3.7 Lifting control
Used to achieve control of the lifting process.
3.8 Torque change rate
JB/T6754.2—1993
The rate of change of the torque of the lifting motor relative to time. 3.9 Control accuracy
The ratio of the absolute value of the difference between the actual speed of the hoisting motor and the given speed to the rated speed under the specified working conditions. 3.10 Manual operation
A mode of operation in which the operation of the hoist is completely controlled manually by the driver. 3.11 Semi-automatic operation
The start of the hoist is manually controlled by the driver, and acceleration, constant speed, deceleration, creeping and parking are automatically controlled. 3.12 Fully automatic operation
A mode in which the hoisting operation is automatically operated according to a predetermined program and speed diagram. At this time, the driver does not need to intervene in the operation of the hoist.
3.13 Emergency operation
For equipment where the hoisting control is completed by a programmable controller, when the programmable controller fails, the most important control and protection functions of the system are retained, and the hoist is operated manually to complete emergency tasks. 4 Technical requirements
4.1 Model and basic parameters
4.1.1 Model
The model composition of the equipment shall comply with the relevant provisions of JB3752. 4.1.2 Rated voltage
The rated output voltage of the converter equipment is recommended to be selected from the following values, or to match the rated voltage of the lifting motor. 220, 440, 630, 800, 1000
4.1.3 Rated current
The rated output current of the converter equipment is recommended to be selected from the following values, or to match the rated current of the lifting motor. 500, 630, 800, 1000, 1250, 1600, 2000, 2500, 3150, 4000, 5000, 6300, 8000A. 4.2 General conditions of use
Electronic control equipment that complies with this standard is installed indoors and can work normally under the following conditions. 4.2.1 Ambient temperature and humidity
The ambient temperature shall not exceed 40℃, and the average temperature within 24 hours shall not exceed 35℃, and the minimum ambient temperature shall not be lower than -5℃. The relative humidity shall not exceed 50% when the maximum temperature is 40℃, and a higher relative humidity is allowed at a lower temperature (such as 90% at 20℃). Attention should be paid to condensation that may occur accidentally due to temperature changes. Note: When there is condensation in the use area, the user should negotiate with the manufacturer to add anti-condensation measures. 4.2.2 Air pollution
The degree of air pollution shall not exceed the relevant provisions of the national environmental sanitation, and shall not contain excessive dust, acid, alkali, corrosive and explosive particles and gases.
4.2.3 Altitude
The altitude shall not exceed 1000m.
4.2.4 Vibration
The vibration conditions allowed at the installation foundation: When the vibration frequency is 10-150Hz, the maximum vibration acceleration shall not exceed 5m/s. 4.2.5 Installation inclination
The installation inclination shall not exceed 5%.
4.2.6 Power grid quality
JB/T6754.21993
The quality of the AC power grid shall comply with the provisions of Article 3.2.6.1 of GB3797. 4.3 Special use conditions
For use conditions that do not meet the provisions of Article 4.2, the user shall raise the issue when placing an order and negotiate with the manufacturer to resolve the issue. 4.4 General requirements
4.4.1 Components and devices
The components and devices installed in the equipment must comply with the requirements of the corresponding standards and product technical documents, and semiconductor devices must undergo aging and screening treatments.
4.4.2 Printed boards
The printed boards installed in the equipment shall comply with the provisions of GB4588.1~4588.2. 4.4.3 Wire color
The color of the wire used in the equipment shall comply with the provisions of GB2681. 4.4.4 Color of indicator lights and buttons
The color of the indicator lights and buttons used in the equipment shall comply with the provisions of GB2682. 4.4.5 Control unit
The control unit used in the equipment shall comply with the test and assessment conditions specified in this standard (see Article 5.1.3). 4.5 Performance indicators
4.5.1 Electrical performance indicators
The electrical performance indicators of the equipment shall meet the requirements of the speed diagram and force diagram of the lifting process. 4.5.1.1 Speed ​​regulation range
The speed regulation range D refers to the ratio of the maximum operating speed n of the lifting motor to the creeping speed nm when the control accuracy S is not greater than the specified value under rated load, that is:
Where: nx——the maximum operating speed when the control accuracy is in accordance with the specified control accuracy, r/min; nens—the creeping speed that meets the specified control accuracy r/min The speed regulation range of the equipment shall not be less than 30.
4.5.1.2 Control accuracy
Control accuracy S refers to the absolute value of the difference between the actual speed n and the given speed n under the specified working conditions, and the ratio to the rated speed n, that is;
S=Jnnil,
where nt is the instantaneous value of the actual speed, r/min; ni is the given value determined by the speed diagram, r/min; n, is the rated speed of the motor, r/min.
In the constant speed section, S should be less than 1%;
In the acceleration and deceleration stage, S should be less than 5%.
4.5.1.3 Torque change rate
In order to meet the requirements of wire rope transmission, the torque change rate of the motor should be limited. The torque change rate is measured by the time required for the motor torque to change from zero to the rated value, which should not be less than 0.3s. 4.5.2 Load level of converter device
.*.(2)
Should choose the similar standard load level according to GB3859 based on the hoist force diagram as much as possible. When the user unit cannot provide the exact force 135
JB/T6754.2—1993
diagram, the load level of the equipment can be considered according to the standard load V level of GB3859. 4.5.3 Noise
The noise generated by the equipment (referring to a single cabinet) during normal operation shall not exceed the sound pressure level of 80dB(A) when measured by a sound level meter. 4.6 Requirements for the composition of the equipment system
4.6.1 Power supply line
The power supply of the equipment shall be a double-circuit line.
4.6.2 Thyristor converter equipment
The thyristor converter equipment used in the equipment shall comply with the relevant provisions of GB3859 and GB3886. 4.6.3 Rectifier transformers and reactors
Rectifier transformers and reactors shall comply with the relevant provisions of the corresponding standards. 4.6.4 Fast switch
Fast switch shall be used as overcurrent protection and coordination protection on the DC side of the converter. 4.6.5 Lifting control equipment
The lifting control equipment can be a low-voltage electrical control equipment, or it can be a device composed of a microprocessor or a programmable controller, and it shall comply with the relevant provisions of GB4720 and GB3797 respectively. 4.6.6 High-voltage electrical equipment
The high-voltage electrical equipment used in the equipment shall comply with the relevant provisions of GB3906. 4.6.7 Harmonic limitation
The limitation and compensation of the sine waveform distortion of the grid voltage and the harmonic current shall be negotiated and resolved by the user and the manufacturer in accordance with the relevant regulations. The harmonic limitation and compensation device shall comply with the relevant standards. 4.7 Protection and interlocking
4.7.1 Emergency stop
In the following cases, the safety brake must be reliably operated and send out the corresponding sound and light alarm signal, and the motor power supply shall be disconnected or the adjustment system shall be blocked; the content of the accident shall be memorized. a.
When the speed of the hoist exceeds 15% of the rated speed; when the hoisting motor or crystalline tube converter or rectifier transformer has overcurrent; when the hoisting container is overwound;bzxZ.net
When the speed of the hoist exceeds the speed limit protection range during the deceleration stage; when the actual running direction of the hoist is opposite to the given direction; when the depth indicator fails;
When the brake shoe wear exceeds the specified value; when the brake oil pressure is overpressure;
For winding hoists, when the lifting wire rope is loosened beyond the specified value; when the tail rope fails ：
When the lifting container is a skip, when the skip is blocked and cannot pass the unloading position smoothly; when the armature of the lifting motor is over-voltage;
When the excitation current of the lifting motor fails; when the overload protection device of the lifting motor is activated; when the lifting motor is blocked;
When the speed measuring device fails;
When the thyristor converter fails;
When the AC and DC power supply of the control system is abnormal; when the temperature of the transformer, reactor, lifting motor and other equipment exceeds the limit value; JB/T 6754.2—1993
When a heavy gas fault occurs in an oil-immersed transformer: When the lifting wire rope slips;
v. When an emergency stop operation is required on site; 4.7.2 Accident Stop
For accident stop, one of the following two methods can be used: 1) Send out corresponding sound and light alarm signals. If the hoist is in operation, the hoist will be stopped after the current lifting is completed, and the next start is not allowed; if the hoist is in the stop state, the start is not allowed, and the operation can be resumed only after the fault is eliminated. 2) Send out corresponding sound and light alarm signals. If the hoist is in operation, electrical braking is performed to stop the hoist, and the start is not allowed, and the operation can be resumed only after the fault is eliminated. When the temperature of the lifting motor, converter transformer, reactor and other equipment is abnormal; a.
When the cooling equipment of the converter and lifting motor fails; When the armature circuit leaks to the ground;
When the control circuit leaks to the ground;
When the brake oil pressure is abnormal;
When the lubricating oil temperature is abnormal;
When the brake spring is fatigued;
When an accident stop is required on site.
4.7.3 Alarm
When an abnormality occurs in a non-critical part of the equipment but does not affect the normal operation of the hoist, an audible and visual alarm signal can be issued, and the driver shall take measures according to the actual situation to decide whether the hoist continues to operate. 4.7.4 Interlocking of the control system
The safety circuit is allowed to be connected only when the speed setting is zero and the hoist is in the locking position; 8.
The hoist is allowed to operate only when the lifting signal is received; b.
After the hoist has overwound in a certain direction, it is only allowed to run in the direction opposite to the overwound direction; for hoists with secondary braking, the secondary braking should be maintained when the power grid is cut off; d.
After the hoist makes an emergency stop during operation, the original driving direction should be memorized and the hoist should be driven in the original direction when resuming operation. If the direction of operation needs to be changed during operation, the machine should be stopped first, and then the driver should manually change the direction of the hoist. In the automatic fixed load lifting system, the working brake should be locked, that is, the working brake can only be released when the motor torque is sufficient to overcome the load torque. When the lifting container reaches the deceleration point, a deceleration command and sound and light signals should be issued to make the hoist start to decelerate, and the relevant control links and protection links (such as given links, speed limit protection links, etc.) should be put into operation. When the AC power supply side switch or the lifting motor magnetic field circuit switch trips, the armature circuit DC fast switch must trip and perform safety braking. However, when the armature circuit DC fast switch trips, other switches may not trip. 1. When the safety circuit protection is activated, the adjustment system should be blocked and the blockade should be released after the fault is eliminated and restored. Only when all auxiliary equipment is put into normal operation according to the specified operating status and sequence, can the hoist system be put into operation. 4.7.5 Operation mode
The equipment should have manual and semi-automatic operation modes. If there are special provisions, it can also have full-automatic operation mode. 4.7.6 Protection against electric shock
Protective measures must be taken to prevent the human body from accidentally touching live parts with a voltage exceeding 50V. For electrical components installed in cabinets (boxes or tables), one or more of the following measures can be taken: Cover the live parts with insulating materials;
b. The electrical clearance and leakage distance between the housing and the protected live body must comply with the provisions of Article 4.8 of this standard; Special tools or keys must be used to open the housing, and the key must be removable and taken away; c.
JB/T6754.2—1993
Parts such as knobs and operating handles should be made of insulating materials, and the metal operating rods connected to them should not be charged. d.
When the circuit is cut off, capacitors with a charge energy of 0.1 should have a discharge circuit. The residual voltage after 2s should not exceed 75Ve.
(peak value). When the charging voltage is high and capacitors that may cause electric shock are concerned, a red lightning symbol 7" should be marked. 4.7.7 Safety grounding
The safety grounding of the equipment shall comply with the provisions of Article 3.10.7.1 of GB3797. 4.8 Electrical clearance and creepage distance
The electrical components and self-contained units that are part of the equipment shall have electrical clearances and creepage distances that comply with the regulations of their respective standards. The electrical clearances and creepage distances of high-voltage electrical equipment shall comply with the relevant standards of high-voltage electrical equipment; the electrical clearances and creepage distances between bare conductors of unequal potential in the equipment, and between live bare conductors and metal parts, components or grounded parts, shall not be less than the provisions of Table 1. Table 1
Rated insulation voltage
60
When the hoist speed exceeds 15% of the rated speed; when the hoisting motor or crystalline tube converter or rectifier transformer has overcurrent; when the hoisting container is overwound;
When the hoist speed exceeds the speed limit protection range during the deceleration stage; when the actual running direction of the hoist is opposite to the given direction; when the depth indicator fails;
When the brake shoe wear exceeds the specified value; when the brake oil pressure is overpressure;
For winding hoists, when the lifting wire rope is loosened beyond the specified value; when the tail rope fails:
When the lifting container is a skip, when the skip is blocked and cannot pass the unloading position smoothly; when the armature of the lifting motor is over-voltage;
When the excitation current of the lifting motor fails; when the overload protection device of the lifting motor is activated; when the lifting motor is blocked;
When the speed measuring device fails;
When the thyristor converter fails;
When the AC and DC power supply of the control system is abnormal; when the temperature of the transformer, reactor, lifting motor and other equipment exceeds the specified limit value; JB/T 6754.2—1993
When a heavy gas fault occurs in an oil-immersed transformer: When the lifting wire rope slips;
v. When an emergency stop operation is required on site; 4.7.2 Accident Stop
For accident stop, one of the following two methods can be used: 1) Send out corresponding sound and light alarm signals. If the hoist is in operation, the hoist will be stopped after the current lifting is completed, and the next start is not allowed; if the hoist is in the stop state, the start is not allowed, and the operation can be resumed only after the fault is eliminated. 2) Send out corresponding sound and light alarm signals. If the hoist is in operation, electrical braking is performed to stop the hoist, and the start is not allowed, and the operation can be resumed only after the fault is eliminated. When the temperature of the lifting motor, converter transformer, reactor and other equipment is abnormal; a.
When the cooling equipment of the converter and lifting motor fails; When the armature circuit leaks to the ground;
When the control circuit leaks to the ground;
When the brake oil pressure is abnormal;
When the lubricating oil temperature is abnormal;
When the brake spring is fatigued;
When an accident stop is required on site.
4.7.3 Alarm
When an abnormality occurs in a non-critical part of the equipment but does not affect the normal operation of the hoist, an audible and visual alarm signal can be issued, and the driver shall take measures according to the actual situation to decide whether the hoist continues to operate. 4.7.4 Interlocking of the control system
The safety circuit is allowed to be connected only when the speed setting is zero and the hoist is in the locking position; 8.
The hoist is allowed to operate only when the lifting signal is received; b.
After the hoist has overwound in a certain direction, it is only allowed to run in the direction opposite to the overwound direction; for hoists with secondary braking, the secondary braking should be maintained when the power grid is cut off; d.
After the hoist makes an emergency stop during operation, the original driving direction should be memorized and the hoist should be driven in the original direction when resuming operation. If the direction of operation needs to be changed during operation, the machine should be stopped first, and then the driver should manually change the direction of the hoist. In the automatic fixed load lifting system, the working brake should be locked, that is, the working brake can only be released when the motor torque is sufficient to overcome the load torque. When the lifting container reaches the deceleration point, a deceleration command and sound and light signals should be issued to make the hoist start to decelerate, and the relevant control links and protection links (such as given links, speed limit protection links, etc.) should be put into operation. When the AC power supply side switch or the lifting motor magnetic field circuit switch trips, the armature circuit DC fast switch must trip and perform safety braking. However, when the armature circuit DC fast switch trips, other switches may not trip. 1. When the safety circuit protection is activated, the adjustment system should be blocked and the blockade should be released after the fault is eliminated and restored. Only when all auxiliary equipment is put into normal operation according to the specified operating status and sequence, can the hoist system be put into operation. 4.7.5 Operation mode
The equipment should have manual and semi-automatic operation modes. If there are special provisions, it can also have full-automatic operation mode. 4.7.6 Protection against electric shock
Protective measures must be taken to prevent the human body from accidentally touching live parts with a voltage exceeding 50V. For electrical components installed in cabinets (boxes or tables), one or more of the following measures can be taken: Cover the live parts with insulating materials;
b. The electrical clearance and leakage distance between the housing and the protected live body must comply with the provisions of Article 4.8 of this standard; Special tools or keys must be used to open the housing, and the key must be removable and taken away; c.
JB/T6754.2—1993
Parts such as knobs and operating handles should be made of insulating materials, and the metal operating rods connected to them should not be charged. d.
When the circuit is cut off, capacitors with a charge energy of 0.1 should have a discharge circuit. The residual voltage after 2s should not exceed 75Ve.
(peak value). When the charging voltage is high and capacitors that may cause electric shock are concerned, a red lightning symbol 7" should be marked. 4.7.7 Safety grounding
The safety grounding of the equipment shall comply with the provisions of Article 3.10.7.1 of GB3797. 4.8 Electrical clearance and creepage distance
The electrical components and self-contained units that are part of the equipment shall have electrical clearances and creepage distances that comply with the regulations of their respective standards. The electrical clearances and creepage distances of high-voltage electrical equipment shall comply with the relevant standards of high-voltage electrical equipment; the electrical clearances and creepage distances between bare conductors of unequal potential in the equipment, and between live bare conductors and metal parts, components or grounded parts, shall not be less than the provisions of Table 1. Table 1
Rated insulation voltage
60
When the hoist speed exceeds 15% of the rated speed; when the hoisting motor or crystalline tube converter or rectifier transformer has overcurrent; when the hoisting container is overwound;
When the hoist speed exceeds the speed limit protection range during the deceleration stage; when the actual running direction of the hoist is opposite to the given direction; when the depth indicator fails;
When the brake shoe wear exceeds the specified value; when the brake oil pressure is overpressure;
For winding hoists, when the lifting wire rope is loosened beyond the specified value; when the tail rope fails:
When the lifting container is a skip, when the skip is blocked and cannot pass the unloading position smoothly; when the armature of the lifting motor is over-voltage;
When the excitation current of the lifting motor fails; when the overload protection device of the lifting motor is activated; when the lifting motor is blocked;
When the speed measuring device fails;
When the thyristor converter fails;
When the AC and DC power supply of the control system is abnormal; when the temperature of the transformer, reactor, lifting motor and other equipment exceeds the limit value; JB/T 6754.2—1993
When a heavy gas fault occurs in an oil-immersed transformer: When the lifting wire rope slips;
v. When an emergency stop operation is required on site; 4.7.2 Accident Stop
For accident stop, one of the following two methods can be used: 1) Send out corresponding sound and light alarm signals. If the hoist is in operation, the hoist will be stopped after the current lifting is completed, and the next start is not allowed; if the hoist is in the stop state, the start is not allowed, and the operation can be resumed only after the fault is eliminated. 2) Send out corresponding sound and light alarm signals. If the hoist is in operation, electrical braking is performed to stop the hoist, and the start is not allowed, and the operation can be resumed only after the fault is eliminated. When the temperature of the lifting motor, converter transformer, reactor and other equipment is abnormal; a.
When the cooling equipment of the converter and lifting motor fails; When the armature circuit leaks to the ground;
When the control circuit leaks to the ground;
When the brake oil pressure is abnormal;
When the lubricating oil temperature is abnormal;
When the brake spring is fatigued;
When an accident stop is required on site.
4.7.3 Alarm
When an abnormality occurs in a non-critical part of the equipment but does not affect the normal operation of the hoist, an audible and visual alarm signal can be issued, and the driver shall take measures according to the actual situation to decide whether the hoist continues to operate. 4.7.4 Interlocking of the control system
The safety circuit is allowed to be connected only when the speed setting is zero and the hoist is in the locking position; 8.
The hoist is allowed to operate only when the lifting signal is received; b.
After the hoist has overwound in a certain direction, it is only allowed to run in the direction opposite to the overwound direction; for hoists with secondary braking, the secondary braking should be maintained when the power grid is cut off; d.
After the hoist makes an emergency stop during operation, the original driving direction should be memorized and the hoist should be driven in the original direction when resuming operation. If the direction of operation needs to be changed during operation, the machine should be stopped first, and then the driver should manually change the direction of the hoist. In the automatic fixed load lifting system, the working brake should be locked, that is, the working brake can only be released when the motor torque is sufficient to overcome the load torque. When the lifting container reaches the deceleration point, a deceleration command and sound and light signals should be issued to make the hoist start to decelerate, and the relevant control links and protection links (such as given links, speed limit protection links, etc.) should be put into operation. When the AC power supply side switch or the lifting motor magnetic field circuit switch trips, the armature circuit DC fast switch must trip and perform safety braking. However, when the armature circuit DC fast switch trips, other switches may not trip. 1. When the safety circuit protection is activated, the adjustment system should be blocked and the blockade should be released after the fault is eliminated and restored. Only when all auxiliary equipment is put into normal operation according to the specified operating status and sequence, can the hoist system be put into operation. 4.7.5 Operation mode
The equipment should have manual and semi-automatic operation modes. If there are special provisions, it can also have full-automatic operation mode. 4.7.6 Protection against electric shock
Protective measures must be taken to prevent the human body from accidentally touching live parts with a voltage exceeding 50V. For electrical components installed in cabinets (boxes or tables), one or more of the following measures can be taken: Cover the live parts with insulating materials;
b. The electrical clearance and leakage distance between the housing and the protected live body must comply with the provisions of Article 4.8 of this standard; Special tools or keys must be used to open the housing, and the key must be removable and taken away; c.
JB/T6754.2—1993
Parts such as knobs and operating handles should be made of insulating materials, and the metal operating rods connected to them should not be charged. d.
When the circuit is cut off, capacitors with a charge energy of 0.1 should have a discharge circuit. The residual voltage after 2s should not exceed 75Ve.
(peak value). When the charging voltage is high and capacitors that may cause electric shock are concerned, a red lightning symbol 7" should be marked. 4.7.7 Safety grounding
The safety grounding of the equipment shall comply with the provisions of Article 3.10.7.1 of GB3797. 4.8 Electrical clearance and creepage distance
The electrical components and self-contained units that are part of the equipment shall have electrical clearances and creepage distances that comply with the regulations of their respective standards. The electrical clearances and creepage distances of high-voltage electrical equipment shall comply with the relevant standards of high-voltage electrical equipment; the electrical clearances and creepage distances between bare conductors of unequal potential in the equipment, and between live bare conductors and metal parts, components or grounded parts, shall not be less than the provisions of Table 1. Table 1
Rated insulation voltage
60In the system of automatic fixed load lifting, the working gate should be locked, that is, the working gate can be released only when the motor torque is sufficient to overcome the load torque;
When the lifting container reaches the deceleration point, a deceleration command and sound and light signals should be issued to make the hoist start to decelerate, and the relevant control links g.
and protection links (such as given links, speed limit protection links, etc.) are put into operation; when the AC power supply side switch or the lifting motor magnetic field circuit switch trips, the armature circuit DC fast switch must trip and perform safety braking h.
, but when the armature circuit DC fast switch trips, other switches may not trip; 1. When the safety circuit protection is activated, the adjustment system should be blocked and the blockade should be lifted after the fault is eliminated and restored; j Only when all auxiliary equipment is put into normal operation according to the specified operating state and sequence, can the hoist system be put into operation. 4.7.5 Operation mode
The equipment should have manual and semi-automatic operation modes, and if there are special provisions, it can also have full-automatic operation mode. 4.7.6 Protection against electric shock
Protective measures must be taken to prevent the human body from accidentally touching live parts with a voltage exceeding 50V. For electrical components installed in a cabinet (box or table), one or more of the following measures may be taken: Cover the live parts with insulating materials;
b. The electrical clearance and leakage distance between the housing and the protected live body must comply with the provisions of Article 4.8 of this standard; Special tools or keys must be used to open the housing, and the keys must be removable and taken away; c.
JB/T6754.2—1993
Parts such as knobs and operating handles should be made of insulating materials, and the metal operating rods connected to them should not be charged. d.
When the circuit is cut off, capacitors with a charge energy of 0.1 should have a discharge circuit. The residual voltage after 2s should not exceed 75Ve.
(peak value). Capacitors with high charging voltages and which may cause electric shocks shall be marked with a red lightning symbol 7” 4.7.7 Safety grounding
The safety grounding of the equipment shall comply with the provisions of Article 3.10.7.1 of GB3797. 4.8 Electrical clearance and creepage distance
The electrical clearance and creepage distance of electrical components and self-contained units as components of the equipment shall comply with the provisions of their respective standards. The electrical clearance and creepage distance of high-voltage electrical equipment shall comply with the relevant standards for high-voltage electrical equipment; the electrical clearance and creepage distance between bare conductors with unequal potentials in the equipment, and between live bare conductors and metal parts, components or grounded parts, shall not be less than the provisions in Table 1. Table 1
Rated insulation voltage
60In the system of automatic fixed load lifting, the working gate should be locked, that is, the working gate can be released only when the motor torque is built up enough to overcome the load torque;
When the lifting container reaches the deceleration point, a deceleration command and sound and light signals should be issued to make the hoist start to decelerate, and the relevant control links g.
and protection links (such as given links, speed limit protection links, etc.) are put into operation; when the AC power supply side switch or the lifting motor magnetic field circuit switch trips, the armature circuit DC fast switch must trip and perform safety braking h.
, but when the armature circuit DC fast switch trips, other switches may not trip; 1. When the safety circuit protection is activated, the adjustment system should be blocked and the blockade should be lifted after the fault is eliminated and restored; j Only when all auxiliary equipment is put into normal operation according to the specified operating state and sequence, can the hoist system be put into operation. 4.7.5 Operation mode
The equipment should have manual and semi-automatic operation modes, and if there are special provisions, it can also have full-automatic operation mode. 4.7.6 Protection against electric shock
Protective measures must be taken to prevent the human body from accidentally touching live parts with a voltage exceeding 50V. For electrical components installed in a cabinet (box or table), one or more of the following measures may be taken: Cover the live parts with insulating materials;
b. The electrical clearance and leakage distance between the housing and the protected live body must comply with the provisions of Article 4.8 of this standard; Special tools or keys must be used to open the housing, and the keys must be removable and taken away; c.
JB/T6754.2—1993
Parts such as knobs and operating handles should be made of insulating materials, and the metal operating rods connected to them should not be charged. d.
When the circuit is cut off, capacitors with a charge energy of 0.1 should have a discharge circuit. The residual voltage after 2s should not exceed 75Ve.
(peak value). Capacitors with high charging voltages and which may cause electric shocks shall be marked with a red lightning symbol 7” 4.7.7 Safety grounding
The safety grounding of the equipment shall comply with the provisions of Article 3.10.7.1 of GB3797. 4.8 Electrical clearance and creepage distance
The electrical clearance and creepage distance of electrical components and self-contained units as components of the equipment shall comply with the provisions of their respective standards. The electrical clearance and creepage distance of high-voltage electrical equipment shall comply with the relevant standards for high-voltage electrical equipment; the electrical clearance and creepage distance between bare conductors with unequal potentials in the equipment, and between live bare conductors and metal parts, components or grounded parts, shall not be less than the provisions in Table 1. Table 1
Rated insulation voltage
60
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