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8 Maintenance
Regular maintenance ensures a long operating life and optimal efficiency of the entire PV plant.
Caution: Before maintenance please disconnect the AC breaker first and then disconnect DC
breaker. Wait 5 minutes until the residual voltage has been released.
8.1 Clearing The Fan
Series inverter is equipped with three fans on its left side. The fan intakes and handle covers
should be cleaned yearly with a vacuum cleaner. For more thorough cleaning, completely remove
the fans.
Disconnect the AC breaker first and then disconnect DC breaker.
Wait 5 minutes until the residual voltage has been released and the fans are no longer turning.
Disassemble the fans (refer to the below figure).
1. Loosen the five screws with a crosshead screwdriver, then remove the fans out the cabinet
about 50mm slowly.
3. Open the lockers of the three fans connectors and remove them from housing, then take the
fans away.
• Clean the ventilation grid and the fan with a soft brush, a paint brush, a cloth, or compressed
air.
• Reassemble the fans into the cabinet
• Please use towel to clean the heatsink once a year.
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8.2 Checking The DC Switch
DC switch does not require any maintenance.
It is recommended, though not compulsory, to:
• Check the DC switch regularly.
• Activate the DC switch 10 times in a row once a year.
Operating the switch will clean the contacts and will extend the life of the DC switch.
Boot order:
1. Turn on the breaker on AC side.
2. Turn on the DC switch.
3. Turn on the breaker on DC side.
Caution: if there is no switch, step 2 is not required.
Shutdown order:
1. Turn off the breaker on AC side.
2. Turn off the DC switch.
3. Turn off the breaker on DC side.
Caution: if there is no switch, step 2 is not required.
8.3 Checking The Electrical Connection
1. Check if the AC or DC wire is loose.
2. Check if the earth wire is reliably grounded .
3. Check if the waterproof covers of RS485 /WiFi port are fasten.
Caution: Maintenance cycle is once every half a year.
4. please use torque wrench to tighten the AC terminal wiring connection once a year;
Caution: Maintenance cycle is once every half a year.
OTHER TEST
For Australia requirements, in the THDi test, there should add Zref between inverter and mains.
Zref:
Zmax or Zref （phase current>16A）
Zref: L: 0.24 Ω + j0.15 Ω; N: 0.16 Ω + j0.10 Ω （phase current>16A, <21.7A）
Zref: L: 0.15 Ω + j0.15 Ω; N: 0.1 Ω + j0.1 Ω （phase current>21.7A, <75A）
Zref: ≥5% Un/Irated+j5% Un/Irated （phasecurrent>75A）
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