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Chapter 13. Troubleshooting & Maintenance
13.3 Precautions for maintenance and inspection
CAUTION
z Make sure to remove the input power while performing maintenance.
z Make sure to perform maintenance after checking the DC link capacitor has
discharged. The bus capacitors in the inverter main circuit can still be
charged even after the power is turned off. Check the voltage between
terminal P or P1 and N using a tester before proceeding.
z C series inverter has ESD (Electrostatic Discharge) sensitive components.
Take protective measures against ESD before touching them for inspection or
installation.
z Do not change any inner parts and connectors. Never modify the inverter.
13.4 Check points
z Daily inspections
9 Proper installation environment
9 Cooling system fault
9 Unusual vibration and noise
9 Unusual overheating and discoloration
z Periodic inspection
9 Screws and bolts may become loose due to vibration, temperature changes, etc.
) Check that they are tightened securely and retighten as necessary.
9 Alien substances are clogged in the cooling system.
) Clean it using the air.
9 Check the rotating condition of the cooling fan, the condition of capacitors and the connections
with the magnetic contactor.
) Replace them if there are any abnormalities.
13.5 Part replacements
The inverter consists of many electronic parts such as semiconductor devices. The following parts may
deteriorate with age because of their structures or physical characteristics, leading to reduced performance or
failure of the inverter. For preventive maintenance, the parts must be changed periodically. The parts replacement
guidelines are indicated in the following table. Lamps and other short-life parts must also be changed during
periodic inspection.
Part name Change period (unit: Year) Description
Cooling fan 3 Exchange (as required)
Smoothing capacitor in main
circuit
4 Exchange (as required)
Smoothing capacitor on control
board
4 Exchange (as required)
Relays - Exchange (as required)
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