SJ700
2
Inverter
T
roub
leshooting
and Maintenance
6–23
For inverters 11kW output and below with molded plastic housings...
The inverters in this category do not have separate capacitor units. It is necessary to replace the
main circuit board, accessible by following the steps below.
1.
Loosen the two screws that secure the
lower
front panel. Remove the panel from the
inverter.
2.
Turn OFF power to the inverter and confirm that the Charge Indicator LED is OFF.
3.
Loosen the two screws that secure the
upper
front panel. Remove the panel from the
inverter.
4.
Press the tabs inward on each side of the cooling fan unit and lift the unit away from the top
of the inverter housing.
5.
Disconnect the fan unit wiring on the circuit board at the top of the inverter.
6.
Disconnect the ribbon cable that connects the control board and main board.
7.
Remove the wiring entry/exit plate and the jumper between terminal [P] and [PD] on the
main board.
8.
Remove the two (2) screws in the plastic housing, and remove the top half of the housing.
Be careful not to damage the plastic tabs at the top corners of the housing.
Fan Assembly
Replacement
The SJ700
2
Series inverters have field-replaceable fan units. The service life of the cooling fan
bearings is approximately 100,000 hours. However, actual results vary with the inverter
operating environment. Inverters running continuously usually need fan unit replacement at
10-year intervals. In addition, fan unit replacement is required immediately if the fan has
abnormal sound or vibration. The fan replacement procedure depends according to the model
(housing type).
For inverters with molded plastic housings...
1.
Loosen the two screws that secure the
lower
front panel.
Remove the panel from the inverter.
2.
Turn OFF power to the inverter and confirm that the Charge
Indicator LED is OFF.
3.
Loosen the two screws that secure the
upper
front panel.
Remove the panel from the inverter.
4.
Press the tabs inward on each side of the cooling fan unit and
lift the unit away from the top of the inverter housing.
5.
Disconnect the fan unit wiring on the circuit board at the top
of the inverter.
6.
Remove the defective fan(s) from the cooling fan mounting
plate.