13. Troubleshooting & Maintenance
13.3Precautions for maintenance and inspection
CAUTION
Make sure to remove the input power while performing maintenance.
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.
Do not change any inner parts and connectors. Never modify the inverter.
13.4Check points Daily inspections
Proper installation environment Cooling system fault Unusual vibration and noise
Unusual overheating and discoloration Periodic inspection
Screws and bolts may become loose due to vibration, temperature changes, etc.
Check that they are tightened securely and retighten as necessary.
Alien substances are clogged in the cooling system.
Clean it using the air.
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.
13.5Part 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
| Part name | Change period (unit: Year) | Description |
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| Cooling fan | 3 | Exchange (as required) | |
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| Smoothing capacitor in main circuit | 4 | Exchange (as required) | |
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| Smoothing capacitor on control | 4 | Exchange (as required) | |
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| Relays | - | Exchange (as required) | |
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