EntelliGuard®TU Trip Unit
Section 5 – Maintenance and Troubleshooting 09/25/08
24 © 2008 General Electric All Rights Reserved
SECTION 5– MAINTENANCE AND
TROUBLESHOOTING
DANGER
ELECTROCUTION
Ensure the circuit breaker has been tripped, indicating
OFF, and the main springs are fully discharged when
performing circuit breaker maintenance.
Failure to comply with these instructions could result
in death or serious injury.
WARNING
IMPROPER INSTALLATION, OPERATION AND
MAINTENANCE
Ensure only qualified personnel install, operate, service
and maintain all electrical equipment.
Failure to comply with these instructions could result
in death or serious injury.
WARNING
PERSONAL INJURY
• Avoid risk of injury from moving parts while handling
the circuit breaker.
• If advisable, use a cable/busbar lockable grounding
device (optional accessory) to provide additional
safety during system maintenance.
Failure to comply with these instructions could result
in death or serious injury.
MAINTENANCE
Rating Plug Removal and Replacement
NOTICE
Removal of the rating plug while the breaker is carrying
current reduces the breaker's current-carrying capacity
to approximately 40% of the current sensor rating.
Interchangeable rating plugs are removed with a Rating
Plug Extractor, Catalog No. TRTOOL. (Suitable equivalents
are commercially available as "integrated circuit (DIP)
extractors.") Grasp the rating plug tabs with the extractor
and pull the plug out as shown in Figure 16.
Be sure to grab the tabs and not the front cover of the
rating plug, or the plug may be damaged.
Figure 16: Rating Plug Removal
TROUBLESHOOTING
Table 21 provides procedures for troubleshooting and
isolating common problems. It does not cover every
possible condition.
Contact Post Sales Service at 1-888-GE-Resolve or 1-888-
437-3765 if these procedures doe not resolve the
problem.
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