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Sigmatek FDD Sizes 7 to 9 Power Installation Guide
4.9.3
Line to ground varistors
Figure 4-11 Removal of size 9E line to ground varistors
To electrically disconnect the line to ground varistors, remove the screw as highlighted above (1).
The line to ground varistors should only be removed in special circumstances such as
ungrounded supplies with more than one source, for example on ships. Where the line to
ground varistors are removed, ensure that line to ground transients are limited to values
of category II. This is to ensure that line to ground transients do not exceed 4 kV as the
drive insulation system from power to ground is designed to category II.Contact the
supplier of the drive for more information.
WARNING
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Summary of Contents for 074.00660
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