Chapter 7. Maintenance and Inspection
7-1
7. Maintenance and Inspection
The servo drive need not be checked and maintained on a daily basis as it uses highly reliable parts,
but inspect it at least once a year. The brushless servo motor is semi-permanent. However, check it
periodically for signs of abnormal noise or vibration.
7.1 Caution
1. When checking motor voltage: As the voltage applied to the motor from the servo amplifier is
PWM controlled pulse train, wave form of pulse phase is displayed. There may be significant
difference in indicator value depending on types of electric and electronic meters. Always use
rectifier type voltmeter to obtain accurate measurement.
2. When checking motor current: The pulse wave form is smoothed to sine wave to a certain
degree by the motor reactance. Connect and use a moving-iron type ampere meter.
3. When checking power: Use an electrodynamics type 3-phase watt-meter.
4. Other meters: Use oscilloscopes or digital voltmeter without letting them make contact with the
ground. Use meters with input current of 1 mA or less.
7.2 Inspection Items
(Caution !!) Charged voltage may remain in the smoothing condenser creating an element of
danger when inspecting the drive. Turn off power and wait for approximately 10
minutes before starting, inspection.
1. Check the inside of the machine for cable chips, dust or other debris and clean it up.
2. Check the terminal screws for looseness. Tighten them if necessary.
3. Check parts for defects (discoloration caused by heat, damage or disconnection).
4. Use high resistance range of the tester to test the conductivity of the control circuit.
Do not use Megger or Buzzer.
5. Check the cooling fan for normal operation.
6. Check for abnormal noise (motor bearing, brakes)
7. Check cables for signs of damage or defects (particularly the detector cables). Check
periodically during operation.
8. Check the load connection axis for center deviation, and make necessary adjustment.
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