1. Inspection before motor installation
1.1 Verification of motor installation dimensions and basic parameters.
1.1.1 General-purpose motors can be checked against the motor catalog. Special motors or motors with technical agreements or outline drawings must be checked item by item according to the agreement requirements and outline drawings. Only after the inspection results are qualified can the next step be carried out.
1.1.2 Whether the motor nameplate is consistent with the contract or agreement.
1.1.3 Rotation direction check.
Low-voltage general-purpose products (H80-H315) have no rotation direction requirement, and the motor can run in both forward and reverse directions; for low-voltage high-power products, it is necessary to check whether the motor direction indicator is consistent with the requirements of the contract or agreement.
High-voltage 2- and 4-pole motors have specific rotation direction requirements, while motors with 6 poles or more do not have rotation direction requirements (except in special cases). The rotation direction must be consistent with the selected rotation direction of the main unit for the motor to function properly; otherwise, excessive motor temperature rise is likely to occur.
1.2 Motor inspection.
1.2.1 DC Resistance Check
Three-phase winding DC resistance check: Measure the DC resistance of the three-phase windings. The difference between the resistance value of any phase and the average value of the DC resistance of the three-phase windings shall not exceed 1% of the average value of the DC resistance of the three-phase windings.
1.2.2 Insulation resistance inspection
Insulation resistance test: Check the insulation resistance of the windings to ground. Use a megohmmeter with an output voltage between 500 and 2500 DC volts to measure the insulation resistance of the stator windings. If the measured value is ≤1MΩ/kV, the windings must be dried.
2. Basic inspection
2.1 The foundation should have sufficient strength to avoid resonance of forces generated by the system and the motor under normal and abnormal operating conditions.
2.2 The foundation should be able to withstand sudden mechanical torques that occur when the motor starts or under abnormal conditions.
2.3 A padding of approximately 2 mm should be allowed on top of the foundation or steel foundation. However, it should not exceed 4 mm under any circumstances.
3. Identify the correct requirements
3.1 When installing the motor, ensure that the center line of the motor shaft is aligned with the center line of the machine being driven; otherwise, it may cause bearing damage and shaft breakage. The tolerances between the two couplings must meet the standards. Pay special attention to protecting the motor's base surface; avoid any bumps or damage to the base surface. When adjusting the motor's center height, add flat shims between the motor's base surface and the rigid foundation; the number of shims should be as small as possible.
3.2 When aligning, ensure sufficient axial clearance and take into account the thermal expansion of the motor.
4. Trial run
4.1 No-load test run: For the initial test run, simply jog the motor and check its rotation direction. If the rotation direction is correct, power on and run the machine. During the initial run, check the motor vibration and bearing temperature every 10 minutes. If there are no abnormalities after 30 minutes, the check interval can be extended to once every 30 minutes. Run for 2 hours; if there are no problems, the test run can be stopped.
4.2 Full-load test run: The full-load test run items are the same as above. However, the running time must reach more than 4 hours.
