JB/T 6201-1992 Technical Specifications for YBDC Series Flameproof Capacitor-Start Single-Phase Asynchronous Motors (Frame Size 71～1007)
Some standard content:
Mechanical Industry Standard of the People's Republic of China
Technical Conditions for YBDC Series Flameproof Capacitor-Start Single-Phase Asynchronous Motors (Frame Size 71~100)
1 Subject Content and Scope of Application
JB6201—1992
This standard specifies the type, basic parameters and dimensions, technical requirements, test methods and inspection rules, as well as marking and packaging requirements for YBDC series flameproof capacitor-start single-phase asynchronous motors. This standard applies to 120~2200WYBDC series flameproof capacitor-start single-phase asynchronous motors (frame size 71~100) (hereinafter referred to as motors). All series of motors derived from this series of motors can also be implemented as a reference. The explosion-proof performance of this series of motors complies with the provisions of GB3836.2 and is made into a flameproof type. The explosion-proof marks are dIAT4 and dIBT4, which are respectively suitable for factories of IA level and IB level, and places with explosive mixtures of flammable gas or steam and air of temperature groups of T1~T4.
2 Reference standards
GB1993
GB5171
ZBK26005
GB9651
JB/Z294
JB/Z346
GB10069.1
GB10068.1
GB2900.25
GB2900.27
GB2900.35
GB12350
GB4831
For explosive atmospheres General requirements for electrical equipmentElectrical equipment for explosive atmospheresFlameproof electrical equipment "d"Motor housing protection classification
Motor cooling method
Motor structure and installation type code
Motor dimensions and tolerancesMotors with frame size 36 to 400 and flange number FF55 to FF1080 or FT55 to FT1080
Basic technical requirements for rotating motors
General technical conditions for small power motors
Basic environmental test procedures for electrical and electronic productsTest Db: Alternating damp heat test methodTechnical conditions for centrifugal switches for starting single-phase motors Single-phase asynchronous motor test method
Test method for insulation between turns of AC low-voltage motor loose-embedded windingTest limit for insulation between turns of AC low-voltage motor embedded windingDetermination method and limit of noise of rotating motorEngineering determination method of noiseDetermination method and limit of vibration of rotating motorDetermination method of vibrationPackaging, storage and transportation graphic mark
Electrical terminologyElectrical terminologyElectrical terminologySmall power motor
Electrical terminologyExplosion-proof electrical equipment for explosive atmosphereSafety requirements for small power motors
Method for compiling motor product models
Ministry of Machinery and Electronics Industry 199 2—06—16 Approved 64
1993—01—01 Implementation
Type, basic parameters and dimensions
JD0201
3.1 The protection grade of the motor main casing is IP44, and can also be made into IP54. The junction box is IP54. 3.2 The cooling method of the motor is IC0141. 3.3 The structure and installation type of the motor are IMB3, IMB34, IMB14, IMB5, IMV5, IMV6, IMV18, IMV19, IMV1 and IMV3, and they are manufactured according to the provisions of Table 1.
Frame number
Structure and installation
B3, B5, B14, B34, V1,
V6, V18, V19
B3, B5, V1, V3, V5, V6
Note: According to user needs, other installation types can be derived according to the provisions of GB997. 3.4 The motor rating is a continuous rating based on the continuous working system (S1). 3.5 The rated frequency of the motor is 50Hz and the rated voltage is 220V. 3.6 The motor should be manufactured according to the following rated powers: 120, 180, 250, 370, 550, 750, 1100, 1500, 2200W. The corresponding relationship between the motor frame number and the speed and power shall be as specified in Table 2. 3.7
Synchronous speed
Motor dimensions and tolerances
Core code
3.8.1 The installation dimensions and tolerances of the motor shall comply with the requirements of Tables 3 to 6, and the overall dimensions shall not be greater than those specified in Tables 3 to 6 (see 1 to Figure 4).
JB6201-1992
(9AWISAWI
JB6201-1992
(6AWI81AWI2
Frame number Flange number
JB6201-1992
Motor (IMB34) with base having foot, small flange on end cover and shaft extension at flange end
Position accuracy
Basic
Basic
Dimensions
1) When the base hole K is an oblong hole, the position accuracy can be exempted from inspection. 2) Dimension P is the maximum limit value.
3) R is the distance from the flange mating surface to the shaft extension shoulder. 68
Position
Overall dimensions shall not exceed
160250
270320
18011852
JB6201—1992
SAIIAI
JB6201—1992
The dimensions and tolerances of the motor shaft extension key shall comply with the provisions of Table 7. Table 7
Nominal shaft extension dimensions
24, 28
The radial runout tolerance at half the shaft extension length shall comply with the provisions of Table 8. Table 8
Shaft extension diameter
>10~18
>18~30
Provisions.
The radial runout tolerance of the flange stop to the motor axis and the end runout tolerance of the flange mating surface to the motor axis shall comply with Table 9. Table 9
The parallelism tolerance of the motor axis to the foot support surface is 0.5mm. The flatness tolerance of the motor foot support surface shall comply with the provisions of Table 10. Table 10
AB or BB maximum size
>100~160
>160~250
Note, AB is the actual distance (viewed from the end) to the outer edge of the motor foot, BB is the actual distance (viewed from the side) to the outer edge of the motor foot. The symmetry tolerance of the motor shaft extension keyway to the center line shall comply with the provisions of Table 11, 3.8.7
Keyway width
4 Technical requirements
Symmetry tolerance
The motor shall comply with the requirements of this standard and be manufactured in accordance with the drawings and documents approved by the prescribed procedures. 4.1
4.2 The motor shall be able to operate at rated value under the following altitude, ambient air temperature and ambient air relative humidity conditions. 4.2.1
Altitude shall not exceed 1000m.
4.2.2 The maximum ambient air temperature shall not exceed 40℃. mm
Note: If the motor is specified to be used at an altitude exceeding 1000m or the maximum ambient air temperature is higher or lower than 40℃, the provisions of GB5171 shall be followed. 4.2.3
The minimum ambient air temperature is -15℃
The average maximum relative humidity of the wettest month is 90%, and the average minimum temperature of the month is not higher than 25℃. 4.3 During the operation of the motor, the deviation of the power supply voltage and frequency from the rated value shall comply with the provisions of GB755. 70
JB62011992
When the voltage and frequency are rated, the guaranteed values of its efficiency and power factor shall comply with the provisions of Table 12. The power,
Note, efficiency of the motor is measured by direct measurement.
The guaranteed value of the ratio of the motor's stall torque to the rated torque shall comply with the provisions of Table 13. At rated voltage,
Stalling torque/rated torque
At rated voltage, the guaranteed value of the ratio of the minimum torque to the rated torque during the motor starting process is 1.2 times. 4.7
At rated voltage, the guaranteed value of the ratio of the motor's maximum torque to the rated torque is 1.8 times. At rated voltage, the guaranteed value of the motor's stall current shall comply with the provisions of Table 14. 4.8
JB6201—1992
The tolerance of the guaranteed value of the motor's electrical performance shall comply with the provisions of Table 15. Table 15
Electrical performance name
Power factorwwW.bzxz.Net
Stalling torque
Minimum torque
Maximum torque
Stalling current
-(1-cos@)/6
Maximum -0.07
Maximum—0.07
Guaranteed value -15%
Guaranteed value -15%
Guaranteed value -10%
Guaranteed value +20%
The motor adopts Class B insulation. When the altitude and ambient air temperature meet the requirements of Article 4.2, the motor stator winding temperature rise limit (resistance method) shall not exceed 80K, the bearing allowable temperature (thermometer method) shall not exceed 95℃, and the highest surface temperature of the housing (thermometer method) shall not exceed 130℃.
If the altitude or ambient air temperature of the test site is different from that of Article 4.2, the temperature rise limit shall be revised according to the provisions of GB755. Note: During the temperature rise test, the motor shall be installed on an iron base plate, and the size of the iron base plate shall meet the requirements of Article 4.5 of GB5171. 4.11 The motor should be able to withstand an over-torque test of 1.45 times the rated torque for 15 seconds without sudden speed change, stalling or harmful deformation when it is hot and with gradually increasing torque. At this time, the voltage and frequency should be maintained at the rated value. 4.12 The motor should be able to withstand an over-speed test of 1.2 times the rated speed for 2 minutes without harmful deformation when it is no-load. The insulation resistance of the motor stator winding should not be less than 1Mα when it is hot or after the temperature rise test. 4.13
4.14 The stator winding of the motor should be able to withstand a 1-minute withstand voltage test without being broken down. The frequency of the test voltage is 50Hz and it should be a sine wave as much as possible. The voltage is 1500V. When a large number of continuously produced motors are inspected and tested, the test time is allowed to be shortened to 1s. The effective value of the test voltage is 1800V. The test voltage is applied with a test rod. 4.15 The stator winding of the motor shall be able to withstand the voltage withstand test without breakdown, and the peak value of the impulse voltage is 2000V and the wavefront time is 0.5μs.
4.16 After the motor winding is tested for 12 cycles according to the 40℃ alternating damp heat test method specified in GB2423.4, the insulation resistance shall not be less than 0.22MQ, and it can withstand the voltage withstand test specified in Article 4.14, with an effective value of 1275V without breakdown, and the flameproof surface of sample 72
shall not be corroded.
JB6201—1992
4.17 The effective value of the vibration velocity measured when the motor is unloaded shall not exceed 2.8mm/s4.18 The noise value of the A-weighted sound power level measured when the motor is unloaded shall not exceed the value selected according to Table 16 when ordering. Table
120~250
Noise level
370~750
15002200
When the motor is inspected and tested, the current and loss of no-load and stalled rotor should be within a certain data range, which should ensure that the motor performance meets the provisions of Articles 4.4 to 4.8 of this standard. 4.20
The centrifugal switch of the motor should meet the provisions of ZBK26005. 4.21
The disconnecting speed of the centrifugal switch of the motor is 70%85% of the synchronous speed. During the starting process of the motor, the voltage at the capacitor terminal should not exceed its maximum allowable voltage value. 4.22
The motor has a cylindrical shaft extension and is driven by a coupling. 4.24
The junction box of the motor is located at the top of the motor and is made into 4 terminals, which are suitable for rubber-sheathed (or plastic) cable structures. 4.25 There should be grounding bolts in the motor housing and terminal box, and ancient symbols should be marked near the grounding bolts. The symbols should ensure that the motor is not easily erased during the entire service life.
When the motor is connected as shown below, the motor rotates clockwise from the shaft extension end. U2
High-center switch, C-
Starting capacitor
4.27 The shaft extension flat key of the motor, the operation and maintenance instructions (at least one copy is provided for a batch of motors of the same type for the same user) and the product certificate should be provided to the user together with each motor. 4.28 If the user uses and stores the motor correctly in accordance with the provisions of the operation and maintenance instructions, the manufacturer should ensure that the motor can operate well within one year of use, but not more than two years from the date of shipment from the manufacturer. If the motor is damaged or cannot work normally due to poor quality within this specified time, the manufacturer should repair or replace parts or motors for the user free of charge. 5 Test methods and inspection rules
5.1 The motor should obtain the "explosion-proof certificate" issued by the explosion-proof inspection unit. 5.2 Each motor must pass the inspection before leaving the factory. 5.3 Each motor should undergo inspection and testing, and the inspection and testing items include: a. Mechanical inspection (according to the provisions of Articles 5.8 and 5.9 of this standard); b. Determination of the insulation resistance of the stator winding to the housing and each other (the cold insulation resistance can be measured during the inspection test, but it should be ensured that the hot insulation resistance is not lower than the provisions of Article 4.13 of this standard); c. Determination of the DC resistance of the stator winding in the actual cold state, d.
Withstand voltage test:
e. Stator winding interturn impulse withstand voltage test; f. Determination of no-load current and loss:
Note: The no-load characteristic curve needs to be measured during the type test. g. Determination of blocked current and loss;
Note: The blocked characteristic curve needs to be measured during the type test: h. Determination of the disconnecting speed of the centrifugal switch;
i. Determination of noise (according to the provisions of Article 5.9 of this standard); j. Determination of vibration (according to the provisions of Article 5.9 of this standard). 5.4 In addition to Article 5.3, the inspection and test items of the motor and its parts shall also include the inspection items specified in the drawings in accordance with GB3836.2. 5.5 Type tests must be carried out in any of the following cases: 8.
When the manufacturer conducts the first trial production or small batch trial production after the identification and finalization: when the changes in the design or process of the motor are sufficient to cause changes in certain characteristics and parameters; b.
When there is an unacceptable deviation between the inspection test results and the previous type test results; c.
Batch-produced motors are regularly inspected, once a year. When the number of inspections required is too large, the inspection interval can be appropriately extended, but at least once every two years. 5.6 The type test items of the motor include: all items of inspection test;
temperature rise test and bearing temperature measurement;
efficiency and power factor measurement;
short-time overtorque test;
maximum torque measurement;
minimum torque measurement during starting; g.
overspeed test;
measurement of the maximum surface temperature of the motor
capacitor terminal voltage measurement.
5.7 In any of the following cases, drawings and documents review and explosion-proof performance test must be carried out in accordance with the provisions of GB3836.2. a.
Products that have not obtained the "explosion-proof certificate": b.
Products that have obtained the "explosion-proof certificate" but have expired; products that have obtained the "explosion-proof certificate" and when the relevant provisions related to explosion-proof performance are changed locally, the drawings, documents c.
and instructions of the changed parts should be sent to the original inspection unit for re-examination; d. When the inspection unit needs to re-inspect the products that have been issued with the "explosion-proof certificate". 5.8 Mechanical inspection items of motors include: 7416 After the motor windings are tested for 12 cycles at 40℃ alternating damp heat test method specified in GB2423.4, the insulation resistance shall not be less than 0.22MQ, and they can withstand the voltage test specified in Article 4.14, with an effective voltage of 1275V, without breakdown, and the flameproof surface of sample 72
shall not be corroded.
JB6201—1992
4.17 The effective value of the vibration velocity measured by the motor at no load shall not exceed 2.8mm/s4.18 The noise value of the A-weighted sound power level measured by the motor at no load shall not exceed the value selected according to Table 16 when ordering. Table
120~250
Noise level
370~750
15002200
When the motor is inspected and tested, the current and loss of no-load and stalled rotor should be within a certain data range, which should ensure that the motor performance meets the provisions of Articles 4.4 to 4.8 of this standard. 4.20
The centrifugal switch of the motor should meet the provisions of ZBK26005. 4.21
The disconnecting speed of the centrifugal switch of the motor is 70%85% of the synchronous speed. During the starting process of the motor, the voltage at the capacitor terminal should not exceed its maximum allowable voltage value. 4.22
The motor has a cylindrical shaft extension and is driven by a coupling. 4.24
The junction box of the motor is located at the top of the motor and is made into 4 terminals, which are suitable for rubber-sheathed (or plastic) cable structures. 4.25 There should be grounding bolts in the motor housing and terminal box, and ancient symbols should be marked near the grounding bolts. The symbols should ensure that the motor is not easily erased during the entire service life.
When the motor is connected as shown below, the motor rotates clockwise from the shaft extension end. U2
High-center switch, C-
Starting capacitor
4.27 The shaft extension flat key of the motor, the operation and maintenance instructions (at least one copy is provided for a batch of motors of the same type for the same user) and the product certificate should be provided to the user together with each motor. 4.28 If the user uses and stores the motor correctly in accordance with the provisions of the operation and maintenance instructions, the manufacturer should ensure that the motor can operate well within one year of use, but not more than two years from the date of shipment from the manufacturer. If the motor is damaged or cannot work normally due to poor quality within this specified time, the manufacturer should repair or replace parts or motors for the user free of charge. 5 Test methods and inspection rules
5.1 The motor should obtain the "explosion-proof certificate" issued by the explosion-proof inspection unit. 5.2 Each motor must pass the inspection before leaving the factory. 5.3 Each motor should undergo inspection and testing, and the inspection and testing items include: a. Mechanical inspection (according to the provisions of Articles 5.8 and 5.9 of this standard); b. Determination of the insulation resistance of the stator winding to the housing and each other (the cold insulation resistance can be measured during the inspection test, but it should be ensured that the hot insulation resistance is not lower than the provisions of Article 4.13 of this standard); c. Determination of the DC resistance of the stator winding in the actual cold state, d.
Withstand voltage test:
e. Stator winding interturn impulse withstand voltage test; f. Determination of no-load current and loss:
Note: The no-load characteristic curve needs to be measured during the type test. g. Determination of blocked current and loss;
Note: The blocked characteristic curve needs to be measured during the type test: h. Determination of the disconnecting speed of the centrifugal switch;
i. Determination of noise (according to the provisions of Article 5.9 of this standard); j. Determination of vibration (according to the provisions of Article 5.9 of this standard). 5.4 In addition to Article 5.3, the inspection and test items of the motor and its parts shall also include the inspection items specified in the drawings in accordance with GB3836.2. 5.5 Type tests must be carried out in any of the following cases: 8.
When the manufacturer conducts the first trial production or small batch trial production after the identification and finalization: when the changes in the design or process of the motor are sufficient to cause changes in certain characteristics and parameters; b.
When there is an unacceptable deviation between the inspection test results and the previous type test results; c.
Batch-produced motors are regularly inspected, once a year. When the number of inspections required is too large, the inspection interval can be appropriately extended, but at least once every two years. 5.6 The type test items of the motor include: all items of inspection test;
temperature rise test and bearing temperature measurement;
efficiency and power factor measurement;
short-time overtorque test;
maximum torque measurement;
minimum torque measurement during starting; g.
overspeed test;
measurement of the maximum surface temperature of the motor
capacitor terminal voltage measurement.
5.7 In any of the following cases, drawings and documents review and explosion-proof performance test must be carried out in accordance with the provisions of GB3836.2. a.
Products that have not obtained the "explosion-proof certificate": b.
Products that have obtained the "explosion-proof certificate" but have expired; products that have obtained the "explosion-proof certificate" and when the relevant provisions related to explosion-proof performance are changed locally, the drawings, documents c.
and instructions of the changed parts should be sent to the original inspection unit for re-examination; d. When the inspection unit needs to re-inspect the products that have been issued with the "explosion-proof certificate". 5.8 Mechanical inspection items of motors include: 7416 After the motor windings are tested for 12 cycles at 40℃ alternating damp heat test method specified in GB2423.4, the insulation resistance shall not be less than 0.22MQ, and they can withstand the voltage test specified in Article 4.14, with an effective voltage of 1275V, without breakdown, and the flameproof surface of sample 72
shall not be corroded.
JB6201—1992
4.17 The effective value of the vibration velocity measured by the motor at no load shall not exceed 2.8mm/s4.18 The noise value of the A-weighted sound power level measured by the motor at no load shall not exceed the value selected according to Table 16 when ordering. Table
120~250
Noise level
370~750
15002200
When the motor is inspected and tested, the current and loss of no-load and stalled rotor should be within a certain data range, which should ensure that the motor performance meets the provisions of Articles 4.4 to 4.8 of this standard. 4.20
The centrifugal switch of the motor should meet the provisions of ZBK26005. 4.21
The disconnecting speed of the centrifugal switch of the motor is 70%85% of the synchronous speed. During the starting process of the motor, the voltage at the capacitor terminal should not exceed its maximum allowable voltage value. 4.22
The motor has a cylindrical shaft extension and is driven by a coupling. 4.24
The junction box of the motor is located at the top of the motor and is made into 4 terminals, which are suitable for rubber-sheathed (or plastic) cable structures. 4.25 There should be grounding bolts in the motor housing and terminal box, and ancient symbols should be marked near the grounding bolts. The symbols should ensure that the motor is not easily erased during the entire service life.
When the motor is connected as shown below, the motor rotates clockwise from the shaft extension end. U2
High-center switch, C-
Starting capacitor
4.27 The shaft extension flat key of the motor, the operation and maintenance instructions (at least one copy is provided for a batch of motors of the same type for the same user) and the product certificate should be provided to the user together with each motor. 4.28 If the user uses and stores the motor correctly in accordance with the provisions of the operation and maintenance instructions, the manufacturer should ensure that the motor can operate well within one year of use, but not more than two years from the date of shipment from the manufacturer. If the motor is damaged or cannot work normally due to poor quality within this specified time, the manufacturer should repair or replace parts or motors for the user free of charge. 5 Test methods and inspection rules
5.1 The motor should obtain the "explosion-proof certificate" issued by the explosion-proof inspection unit. 5.2 Each motor must pass the inspection before leaving the factory. 5.3 Each motor should undergo inspection and testing, and the inspection and testing items include: a. Mechanical inspection (according to the provisions of Articles 5.8 and 5.9 of this standard); b. Determination of the insulation resistance of the stator winding to the housing and each other (the cold insulation resistance can be measured during the inspection test, but it should be ensured that the hot insulation resistance is not lower than the provisions of Article 4.13 of this standard); c. Determination of the DC resistance of the stator winding in the actual cold state, d.
Withstand voltage test:
e. Stator winding interturn impulse withstand voltage test; f. Determination of no-load current and loss:
Note: The no-load characteristic curve needs to be measured during the type test. g. Determination of blocked current and loss;
Note: The blocked characteristic curve needs to be measured during the type test: h. Determination of the disconnecting speed of the centrifugal switch;
i. Determination of noise (according to the provisions of Article 5.9 of this standard); j. Determination of vibration (according to the provisions of Article 5.9 of this standard). 5.4 In addition to Article 5.3, the inspection and test items of the motor and its parts shall also include the inspection items specified in the drawings in accordance with GB3836.2. 5.5 Type tests must be carried out in any of the following cases: 8.
When the manufacturer conducts the first trial production or small batch trial production after the identification and finalization: when the changes in the design or process of the motor are sufficient to cause changes in certain characteristics and parameters; b.
When there is an unacceptable deviation between the inspection test results and the previous type test results; c.
Batch-produced motors are regularly inspected, once a year. When the number of inspections required is too large, the inspection interval can be appropriately extended, but at least once every two years. 5.6 The type test items of the motor include: all items of inspection test;
temperature rise test and bearing temperature measurement;
efficiency and power factor measurement;
short-time overtorque test;
maximum torque measurement;
minimum torque measurement during starting; g.
overspeed test;
measurement of the maximum surface temperature of the motor
capacitor terminal voltage measurement.
5.7 In any of the following cases, drawings and documents review and explosion-proof performance test must be carried out in accordance with the provisions of GB3836.2. a.
Products that have not obtained the "explosion-proof certificate": b.
Products that have obtained the "explosion-proof certificate" but have expired; products that have obtained the "explosion-proof certificate" and when the relevant provisions related to explosion-proof performance are changed locally, the drawings, documents c.
and instructions of the changed parts should be sent to the original inspection unit for re-examination; d. When the inspection unit needs to re-inspect the products that have been issued with the "explosion-proof certificate". 5.8 Mechanical inspection items of motors include: 74Determination of stall current and loss;
Note: During type test, the stall characteristic curve needs to be measured: h. Determination of the disconnecting speed of the centrifugal switch;
i. Determination of noise (according to the provisions of Article 5.9 of this standard); j. Determination of vibration (according to the provisions of Article 5.9 of this standard). 5.4 In addition to Article 5.3, the inspection and test items of motors and their parts shall also include the inspection items specified in the drawings in accordance with GB3836.2. 5.5 Type test must be carried out in any of the following cases: 8.
When the manufacturer conducts the first trial production or small batch trial production after the finalization of the identification: when the design or process of the motor changes, which is sufficient to cause changes in certain characteristics and parameters; b.
When the inspection test results and the previous type test results have an unacceptable deviation; c.
Batch-produced motors are regularly inspected, once a year. When the number of inspections is too large, the inspection interval can be appropriately extended, but at least once every two years. 5.6 The type test items of the motor include: all items of inspection test;
temperature rise test and bearing temperature measurement;
efficiency and power factor measurement;
short-time overtorque test;
maximum torque measurement;
minimum torque measurement during starting; g.
overspeed test;
measurement of the maximum surface temperature of the motor
capacitor terminal voltage measurement.
5.7 In any of the following cases, drawings and documents review and explosion-proof performance test must be carried out in accordance with the provisions of GB3836.2. a.
Products that have not obtained the "explosion-proof certificate": b.
Products that have obtained the "explosion-proof certificate" but have expired; products that have obtained the "explosion-proof certificate" and when the relevant provisions related to explosion-proof performance are changed locally, the drawings, documents c.
and instructions of the changed parts should be sent to the original inspection unit for re-examination; d. When the inspection unit needs to re-inspect the products that have been issued with the "explosion-proof certificate". 5.8 Mechanical inspection items of motors include: 74Determination of stall current and loss;
Note: During type test, the stall characteristic curve needs to be measured: h. Determination of the disconnecting speed of the centrifugal switch;
i. Determination of noise (according to the provisions of Article 5.9 of this standard); j. Determination of vibration (according to the provisions of Article 5.9 of this standard). 5.4 In addition to Article 5.3, the inspection and test items of motors and their parts shall also include the inspection items specified in the drawings in accordance with GB3836.2. 5.5 Type test must be carried out in any of the following cases: 8.
When the manufacturer conducts the first trial production or small batch trial production after the finalization of the identification: when the design or process of the motor changes, which is sufficient to cause changes in certain characteristics and parameters; b.
When the inspection test results and the previous type test results have an unacceptable deviation; c.
Batch-produced motors are regularly inspected, once a year. When the number of inspections is too large, the inspection interval can be appropriately extended, but at least once every two years. 5.6 The type test items of the motor include: all items of inspection test;
temperature rise test and bearing temperature measurement;
efficiency and power factor measurement;
short-time overtorque test;
maximum torque measurement;
minimum torque measurement during starting; g.
overspeed test;
measurement of the maximum surface temperature of the motor
capacitor terminal voltage measurement.
5.7 In any of the following cases, drawings and documents review and explosion-proof performance test must be carried out in accordance with the provisions of GB3836.2. a.
Products that have not obtained the "explosion-proof certificate": b.
Products that have obtained the "explosion-proof certificate" but have expired; products that have obtained the "explosion-proof certificate" and when the relevant provisions related to explosion-proof performance are changed locally, the drawings, documents c.
and instructions of the changed parts should be sent to the original inspection unit for re-examination; d. When the inspection unit needs to re-inspect the products that have been issued with the "explosion-proof certificate". 5.8 Mechanical inspection items of motors include: 74
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