35
9400000-J0 Rev E
10.3 MOV Replacement
10.3.1 4.0kW Rectifier MOV Replacement
Part number: 707-813-20-000
The MOVs (metal oxide varistor) are used to protect the power modules from power line surges and surges caused
by lightning strikes. High capacity surges may permanently damage MOVs but they are easily replaced in the field
using the following procedure:
1. Shut off the unit and unscrew the front fastener that secures the power module to the shelf.
2. Slide the module 10cm (4") out of the shelf and wait ten minutes for the module capacitors to discharge.
Back panel
Back panel screws
3. Remove the two screws that secure the back panel to the module.
MOV PCB
MOVs
