Digitax ST Installation Guide 31
Issue: 7
Safety Information Introduction Mechanical Installation
Electrical Installation
UL Listing Information
the second environment.
For longer motor cables, the filter continues to provide a useful reduction in emission
level, and when used with any length of shielded cable up to the limit for the drive, it is
unlikely that nearby industrial equipment will be disturbed. It is recommended that the
filter be used in all applications unless the ground leakage current is unacceptable or
the above conditions are true.
Figure 4-3 Removing the internal EMC filter and line to ground varistors
1. Internal EMC filter. Remove the bottom screw as shown.
2. Line to ground varistors. Remove the top screw as shown.
4.6.2 Further EMC precautions
Further EMC precautions are required if more stringent EMC emission requirements apply:
• Operation in the first environment of EN 61800-3:2004
• Conformity to the generic emission standards
• Equipment which is sensitive to electrical interference operating nearby
In this case it is necessary to use:
• The optional external EMC filter
• A shielded motor cable, with shield clamped to the grounded metal panel
• A shielded control cable, with shield clamped to the grounded metal panel via the
grounding bracket
The supply must be disconnected before removing the internal EMC filter or line to
ground varistor screws.
The line to ground varistors should only be removed in special circumstances.
It is not necessary to remove the external EMC filter when using an IT supply.
To Next Page
Loading...
Need help?
General