DRV-28 inverter
s
-253-
Cooling fan replacement
Read the safety precautions carefully and follow the instructions to perform
operations. Otherwise, physical injuries or damage to the device may be
caused.
1.
Stop the device, disconnect the AC power supply, and wait for a time no shorter than the waiting
time designated on the inverter.
2.
Open the cable clamp to loose the fan cable (for inverters of 400V, 1.5 to 30 kW, the middle
casing needs to be removed).
3.
Remove the fan cable.
4.
Remove the fan with a screwdriver.
5.
Install a new fan in the inverter in the reverse steps. Assemble the inverter. Ensure that the air
direction of the fan is consistent with that of the inverter, as shown in the following figure.
Rotating direction
Air direction
Air
direction
Fig 8.1 Fan maintenance for inverters of 7.5 kW or higher
6.
Power on the inverter.
8.4 Capacitor
8.4.1 Capacitor reforming
If the inverter has been left unused for a long time, you need to follow the instructions to reform the
DC bus capacitor before using it. The storage time is calculated from the date the inverter is
delivered.
Storage time
Operation principle
Less than 1 year
No charging operation is required.
1 to 2 years
The inverter needs to be powered on for 1 hour before the first running
command.
2 to 3 years
Use a voltage controlled power supply to charge the inverter: