8 Caution
Regular maintenance ensures a long operating life and optimal efficiency of the entire PV plant.
Caution: Before maintenance, please first disconnect the AC breaker. Then disconnect the DC
breaker. Wait 5 min until the residual voltage has been released.
8.1 Clearing The FAN
The MT series inverter is equipped with three fans on its left side. The fan intakes and handle
covers should be cleaned yearly using a vacuum cleaner. For more thorough cleaning, complete-
ly remove the fans.
1. Disconnect the AC breaker first. Then, disconnect the DC breaker.
2. Wait 5 min until the residual voltage has been released, and the fans are no longer running.
3. Disassemble the fans (Refer to the below figure).
• Loosen the five screws using a crosshead screwdriver. Then, slowly remove the fans out of
the cabinet about 50mm.
• Open the lockers of the three fan connectors and remove them from housing. Then uninstall
the fans.
4. Clean the ventilation grid and the fans with a soft brush, or compressed air.
5. Reinstall the fans into the cabinet.
8.2 Checking the DC switch
DC switch does not require any maintenance
Although not mandatory, maintenance below is still recommended:
• Check the DC switch regularly.
• Activate the DC switch 10 times in a row once per year.
Operating the switch will clean the switch and will extend its life .
8.3 Turn On / Off the Inverter
Boot order:
1. Turn on the breaker on the AC side.
2. Turn on the DC switch.
3. Turn on the breaker on the DC side.
Note: If there is no switch, only perform steps 1 and 3 (please skip step 2).
Shutdown order:
1. Turn off the breaker on the AC side.
2. Turn off the DC switch.
3. Turn off the breaker on the DC side.
Note: If there is no switch, only perform steps 1 and 3 (please skip step 2).
8.4 Checking the Electrical Connection
1. Check if the AC or DC wire is loose.
2. Check to ensure the earth wire is reliably grounded.
3. Check if the waterproof covers of the RS485 and USB port are fastened.
Note: Maintenance cycle is once every half year.
8.5 Fuse Replacement
If the inverter fuses are broken, replace them quickly. The steps are as follows:
1. Disconnect the circuit breaker on the AC side.
2. Rotate the DC switch to the 'OFF' position.
3. Disconnect the front-end circuit breaker of the PV input terminal or pull out the PV input
terminal.
4. Wait at least 10 min.
5. Open the junction box's cover on the bottom of inverter.
6. Confirm that the fuses are broken.
7. Remove the broken fuses vertically as shown in the
right figure. Do not remove fuses by prying or via
similiar methods.
8. Install the same model fuses from the same
company to the corresponding fuse holders.
9. Install the junction-box cover on the inverter.
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