This standard specifies the working conditions, technical requirements, test methods, inspection rules and packaging and transportation of marine AC cargo winch control boxes. JB/T 5795-1991 Marine AC cargo winch control box JB/T5795-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Marine AC Cargo Winch Control Box
This standard refers to the relevant provisions of the international standard IEC92 publication "Marine Electrical Equipment". 1 Subject content and scope of application
JB/T5795-1991
This standard specifies the working conditions, technical requirements, test methods, inspection rules, packaging and transportation of the marine AC cargo winch control box (hereinafter referred to as the control box).
This standard is applicable to AC 50Hz, 380V, 60Hz, 440V control boxes. After the product is matched with the marine master controller, it controls the frequent starting, braking, forward rotation, reverse rotation, speed change and protection of the AC variable-pole variable-speed asynchronous motor in the cargo winch. 2 Reference standards
Basic environmental test regulations for electric and electronic products Test A: Low temperature test method GB2423.2
GB2423.16
Basic environmental test regulations for electric and electronic products Test B: High temperature test method
Basic environmental test regulations for electric and electronic products Test Db: Alternating damp heat test method
Basic environmental test regulations for electric and electronic products Basic environmental test regulations for electric and electronic products GB2423.17
GB2900
GB3783
GB3893
GB7061
GB7094
GB7251
JB30 84
JB4159
Electrical terminology
Basic standard for marine low-voltage electrical appliances
Terms and expressions for marine deck machinery
Protection level of low-voltage electrical appliance enclosure
Test J: Mildew test method
Test Ka: Salt spray test method
General technical conditions for marine low-voltage switchgear and control equipment Vibration test method for marine electrical equipment
Low-voltage complete switchgear
Product packaging and transportation regulations for electric drive control stations General technical requirements for tropical electrical products
ZBU04001 Method for compiling models of marine low-voltage switchgear and electric control equipment 3 Terms
Except for the terms specified in this standard. For other terms, see GB2900 and GB38933.1 Single-speed
The speed of the stator winding with the largest number of pole pairs of variable-pole variable-speed asynchronous motor when it is energized. 3.2 Two-speed
Pole-changing variable-speed asynchronous motor has a speed higher than the first speed only. 3.3 Three-speed
Pole-changing variable-speed asynchronous motor has a speed higher than the second speed only. 3.4 Four-speed
Pole-changing variable-speed asynchronous motor has a speed higher than the third speed. Approved by the Ministry of Machinery and Electronics Industry on October 15, 1991 and implemented on October 1, 1992
4 Models and classifications
4.1 Models and representative meanings of control boxes: x
JB/T5795—1991
Speed ​​classification of controlled motors
Rated working current of main contactor
Design serial number
Cargo winch
Box-shaped structure
4.2 Unless otherwise required, the control box is divided into 25, 40, 63, 100, 160, 250A according to the rated working current of the main contactor. 4.3 The control box is divided into 2-speed, 3-speed, 4-speed according to the maximum speed of the asynchronous motor being controlled. 4.4 The dimensions of the control box are shown in Figure 1 and Table 1. W
Figure 1 Dimensions of the control box
Normal working conditions
400, 520, 600, 660, 700, 800, 900, 1000220, 260, 280, 300, 340, 400, 460700, 800, 1000, 1200, 1400, 1600, 1800, 2000The control box should be able to work normally under the following environmental conditions: a.
Ambient air temperature The temperature should not be higher than 45℃ and not lower than -25℃; it should be able to withstand the humid air at sea;
JB/T5795-1991
It should be able to adapt to the environment with salt mist, oil mist and mold: tilt: ±22.5°;
swing: ±22.5°, Www.bzxZ.net
It should be able to withstand the vibration and impact generated during the normal operation of the ship; it should be able to withstand the AC power supply voltage change of 10%~10% of the rated voltage; the frequency change is rated frequency ±5%. g.
6 Technical requirements
Circuit function design
The main circuit and the control circuit are powered by the same feeder, and the main circuit should be equipped with a power switch. The circuit should have the following protection functions.
Short circuit and overload protection;
Protection against loss of pressure and single-phase operation;
Emergency stop device;
Interlocking of winch motor forward and reverse rotation:
Overheat protection of winch motor winding;
Interlocking of fan and control circuit;
Interlocking with other auxiliary machinery.
6.1.3 For three-speed motors, the control circuit automatically changes the motor speed step by step according to the time principle (0-1st speed-2nd speed-3rd speed). The acceleration time can be adjusted according to the principle of minimum motor impact current, minimum energy loss and shortest starting time. Unless otherwise specified, it should be selected according to the data in Table 2.
Motor capacity
1st speed 2nd speed
2nd speed 1st speed 3rd speed
3rd speed 1st speed 4th speed
6.1.4For 4-speed motor, see 6.1.3 for acceleration from 0 to 3rd speed; when the load current is less than 50% of the rated current, it will automatically switch from 3rd speed to 4th speed.
The control circuit should ensure that the motor has a fast and smooth 3-stage braking process: electrical regenerative braking;
Electrical regenerative braking and motor electromagnetic brake braking at the same time; electromagnetic brake braking alone.
During the speed change, the free fall of heavy objects should be prevented. V
6.1.7If the crane brakes when lowering the rated load at the rated speed V (m/min), the sliding distance should not exceed 100m.
6.2 Structural design
6.2.1The control box is a steel plate bending structure. After welding, it should have sufficient mechanical strength to ensure that it will not deform during installation, manufacturing and transportation. 6.2.2 The panel of the control box should be flat and symmetrical, and the inner and outer surfaces should be sprayed with a solid covering layer. The color should be uniform and there should be no defects such as blistering, cracks or flow marks.
6.2.3 The door of the control box should be able to open and close flexibly at an angle of not less than 90°, and its opening and closing position can be fixed. 6.2.4 The shell of the control box should be equipped with a copper grounding screw of not less than M6, and there should be an obvious grounding mark. The contact between the shell and the screw is required to be reliable. The contact resistance value should be less than 0.10. 6.2.5 All steel fasteners in the control box should have sufficient mechanical strength and corrosion resistance, and all connectors and fasteners should have anti-loosening devices. 6.2.6 The shell protection level of the control box should not be lower than IP22, and the protection level should not be reduced after the external cable enters. 121
JB/T5795-1991
6.2.7 If the control box door is equipped with electrical components, there should be a reliable grounding device on the door. 6.3 Selection and installation of electrical components.
6.3.1 The performance of all electrical components should comply with the requirements of GB3783 or their own technical standards. 6.3.2 All electrical components should be installed and adjusted according to the specified installation conditions. They should be easy to check, repair and replace, and should not produce harmful noise and vibration.
6.3.3 All electrical components should be firmly fixed; each component should be marked with a clear and durable symbol or code consistent with the electrical schematic. The rated current of the fuse should have a durable mark. 6.3.4 All electrical components should be installed so that their normal functions will not be damaged or malfunction due to interaction (such as heating, arcing, vibration, electromagnetic field, etc.).
6.4 Number of wires
6.4.1 The main circuit wires can be of different cross-sections according to the rated current of the main contactor or the controlled motor. 6.4.2 The connecting wires of the control circuit should be multi-strand plastic soft wires with a rated insulation voltage of not less than 500V, and the wire cross-section should not be less than 1mm. The grounding wires should be distinguished by yellow and green. 6.4.3 The insulation layer of all circuit connecting wires and the supporting parts for wiring should be made of flame-retardant materials. 6.4.4 The insulated wires connecting the electrical components in the control box should be wired in wire troughs, otherwise the appropriate number of wires should be tied and fixed at a certain distance.
6.4.5 The ends of the connecting wires between the electrical components should be pressed with copper joints. The connecting wires between two wiring points should not have intermediate connectors, and the connections of all wiring terminals must be firm.
6.4.6 All wires connected to external devices in the control box should be concentrated on the wiring terminals. For the lead wires with larger current, they are allowed to be led out from the connectors of the components themselves and should be fixed. 6.4.7 The arrangement and marking of the three-phase sequence of the main circuit should comply with the provisions of GB7061. 6.4.8 Each terminal on the terminal board can only connect one wire. When two or more wires need to be connected, there should be a connection point designed for this purpose.
6.4.9 The wire connected to the heating resistor should be stripped of an insulation layer of no less than 40mm long and covered with heat-resistant insulating material. 6.4.10 The ends of all connecting wires and terminals should be marked with the symbols or numbers of each circuit according to the electrical principle diagram. The markings should be clear and durable.
6.5 Temperature rise
The temperature rise of each part of the control box shall not exceed the requirements of Table 3 (ambient temperature is 45℃). Table 3
Internal electrical components
Contact point of main circuit wire (tinning)
Contact point of main circuit wire (silver plating)
Possible touching shell or parts,
Metal
Insulated
Operating handle:
Metal
Insulated
Connection terminal of external insulated wire
Insulated wire
6.6 Electrical insulation performance
According to the standard applicable to the appliance
According to its own allowable value
6.6.1 Electrical clearance and creepage distance
JB/T5795—1991
The electrical clearance and creepage distance between each exposed live conductor or part of the control box, and between them and the casing shall not be less than the provisions of Table 4 (except for electronic components and electrical components themselves). Table
Rated insulation voltage
300≤660
6.6.2 Dielectric strength
≤63A
Electrical trace
≤63A
Creep distance
The insulation of the control box should be able to withstand the following power frequency test voltage value (effective value), and there should be no breakdown or flashover phenomenon within the specified time. The power frequency test voltage value of the main circuit and the auxiliary circuit and control circuit directly connected to the main circuit shall be as specified in Table 5. 6.6.2.1
Rated insulation voltage
60≤300
300
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