5.2 Daily and annual maintenance
| Item | Contents | Interval | Method | Criteria | |
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| Ambient | Check ambient temperature, |
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| Refer to | Ambient temperature: |
| humidity, dust, corrosive gas, oil | X |
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Overall | Environment |
| 2.1. Installation | |||
and noise. | X |
| No abnormalities | |||
overall |
| Visual inspection | ||||
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| mist, etc. |
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| No condensation |
| Devices | Check for abnormal vibrations |
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| Power supply | Check voltage between | X |
| Measure the voltage between | No abnormalities and |
| voltage | input lines |
| input terminals | within specifications | |
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| Remove connector J61 |
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| Disconnect power line |
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| Megger check |
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| Remove logic terminal |
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| Overall |
| X | Make short circuit R, S, T, U, | > 5Mohm | |
| (Power terminal - Earth) |
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| V, W, P, PD ,N ,RB |
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| Megger test between above |
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| and earth |
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| Check installation for looseness. |
| X | Tighten | No abnormalities |
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| Check for evidence of over |
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| heating in the various |
| X | Visual inspection | No abnormalities |
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| components |
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| Conductors / | Cleaning |
| X |
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| No change in shape? |
| X | Visual inspection | No abnormalities | |
| cables |
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| No damage in coating? |
| X | Visual inspection | No abnormalities | |
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| Terminal block | No damage? |
| X | Visual inspection | No abnormalities |
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| Remove power cables | Refer to |
Mains | Inverter / | Tester check between each |
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| Measure resistance; | |
| X | “5.5 How to measure | ||||
| Each output ⇔ P, N | |||||
| Converter | terminal |
| Each input ⇔ P, N | inverter & | |
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| with 1ohm range | converter“ portion |
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| DC bus capacitor | Check for leaking liquid | X |
| Visual inspection | No abnormalities |
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| Check for swelling | X |
| Visual inspection | No abnormalities |
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| Check for capacitance |
| X | With capacitance meter | 85% or more of rated |
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| capacitance | |||
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| Check for stuttering noise during |
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| Relay, contactor |
| X | Aural inspection | No abnormalities | |
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| operation |
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| No damage of contact? |
| X | Visual inspection | No abnormalities |
| Resistors | Check for cracks or |
| X | Visual inspection | No abnormalities |
| changes in color |
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| Tolerance of within | |
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| No open circuit? |
| X | Tester check | |
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| ±10% of rated value | |||
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Cooling | Cooling fan | Check for abnormal | X |
| Rotate manually | Smooth rotation and |
vibration and noise |
| during power off | no abnormalities | |||
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| Check for dust | X |
| Visual inspection | No abnormalities |
circuit |
| Check the balance of the output |
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| Measure the output voltage | Within 2% of voltage |
Operation check | voltage of each phase to phase |
| X | difference between | ||
| between U, V and W | |||||
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| without motor. |
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| each phases. | |
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Control |
| Perform a sequence protection |
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| operation test and make sure |
| X | Simulate operation of the | Each protection should | |
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| that there are no errors in the |
| protection circuit | be performed | |
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| protection and display circuits. |
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| No illegible display; |
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LED display | Display | No missing characters; | X | X | Visual inspection | No abnormalities |
| Cleaning |
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| No segment failure of LEDs |
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| Meter | Working correct? | X | X | Visual inspection | Displays correct value |
| Overall | No abnormal vibration & noise? | X |
| Visual, aural inspection | No abnormalities |
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| No abnormal smell? | X |
| Confirm the smell caused by | No abnormalities |
Motor |
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| overheat, damage etc. | |||
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Insulation | Megger check |
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| Measure resistance; |
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| X | Each input ⇔ Earth | > 5Mohm | ||
| resistance | All terminals together - Earth |
| With and without motor | ||
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| cables |
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5- 2
