The facility for disconnecting the jumper (link) between varistors and ground is provided for special circumstances, where a sustained high voltage may be present between lines and ground, for example during a high potential test or in certain situations with IT supplies and multiple generators. If the jumper (link) is disconnected, then the immunity of the drive to high voltage impulses is reduced. It is then only suitable for use with supplies having overvoltage category II, i.e. not for connection at the origin of the low voltage supply within a building.
The method for disconnecting the MOV ground connection on size 1 drives (MP and QMP)
is shown below:
- Remove the M4 x 16 screw using T20 Torx driver.
- Remove the M4 x 12 screw using T20 Torx driver.
- Remove the plate.
- Re-fit the M4 x 12 screw using T20 Torx driver and tighten to a torque of 0.6 N m (0.44 Ib ft).
- Fit a M4 x 16 nylon screw (not supplied) and tighten to a torque of 0.25 N m (0.18 Ib ft).
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