Hitachi SJ7002 Series Instruction Manual page 271

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
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
4. Press the tabs inward on each side of the cooling fan unit and lift the unit away from the top
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
8. Remove the two (2) screws in the plastic housing, and remove the top half of the housing.
Fan Assembly
The SJ700
Replacement 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.
2. Turn OFF power to the inverter and confirm that the Charge
3. Loosen the two screws that secure the upper front panel.
4. Press the tabs inward on each side of the cooling fan unit and
5. Disconnect the fan unit wiring on the circuit board at the top
6. Remove the defective fan(s) from the cooling fan mounting
inverter.
inverter.
of the inverter housing.
main board.
Be careful not to damage the plastic tabs at the top corners of the housing.
Series inverters have field-replaceable fan units. The service life of the cooling fan
2
Remove the panel from the inverter.
Indicator LED is OFF.
Remove the panel from the inverter.
lift the unit away from the top of the inverter housing.
of the inverter.
plate.
6–23
SJ700 Inverter
2