Nidec H300 - Line to Ground Varistors

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HVAC Drive H300 99
Issue Number: 3
Figure 4-30 Removal of the size 6 internal EMC filter
To electrically disconnect the Internal EMC filter, remove the screw as
highlighted above (1).
Figure 4-31 Removal of the size 7, 8 and 9A internal EMC filter and line to
ground varistors (size 7 shown)
To electrically disconnect the Internal EMC filter, remove the screw as
highlighted above (1).
To electrically disconnect the line to ground varistors, remove the screw
as highlighted above (2)
The Internal EMC filter on size 9E, 10E and 11E cannot be removed.
4.11.3 Line to ground varistors
Figure 4-32 Removal of size 9E and 10E line to ground varistors
To electrically disconnect the line to ground varistors, remove the screw
as highlighted above (1).
Figure 4-33 Removal of line to ground varistors (size 11E)
To electrically disconnect the line to ground varistors, remove the two
screws highlighted (1) above and remove the bracket (2).
The line to ground varistors should only be removed in special
circumstances.
1
1
2
NOTE
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
1
1
2
1
NOTE