EntelliGuard®TU Trip Unit
09/25/08 Section 5– Maintenance and Troubleshooting
© 2008 General Electric All Rights Reserved 25
Table 21: Troubleshooting Guide
The trip unit display is blank. External +24 VDC is absent.
The load current fluctuates near 20% of
the breaker sensor rating.
At least 20% of the current sensor rating,
(xCT) must be flowing through the breaker
to activate the display.
If not, power the trip unit with the internal
battery.
The battery power supply is disabled
when any current is sensed through the
current sensors.
Check that the control power supply is
present and operational.
The trip unit display E02.
BIM error.
No communication with the BIM
Check the BIM harness.
Mismatch trip unit / BIM option
The trip unit display E03. Memory failure.
Return the unit to GE.
The trip unit display E06. Internal failure.
Return the unit to GE.
The trip unit display E08. Invalid rating plug.
Check the rating plug. The rating plug
value shall not exceed and be below 40%
of the breaker sensor.
Ensure the rating plug is properly sited.
Unit does not communicate with
the Master.
The communication wires are shorted
or improperly connected.
Incorrect baud rate.
Incorrect address.
Locate and repair the short or the
incorrect connection.
Check that the baud rate assigned to the
trip unit, agrees with the baud rate at the
host.
Check that the address assigned to the
trip unit, agrees with the address at the
host.
Current readings are incorrect. Incorrect rating plug value.
Check the rating plug label.
Voltage readings are incorrect. The potential transformer (PT) primary
voltage was defined incorrectly.
The PT connection was defined
incorrectly.
Read the PT primary rating from the PT
name plate and set trip unit PT to this
value.
Set the trip unit phase to phase PH-PH or
phase to neutral PH-N according to the
system.
The display is blank or the Low
Battery symbol appears when the
BATTERY key is pressed.
Line current is below 20% of the
breaker sensor rating.
The battery is discharged.
The battery was stored too long with no
power applied to the trip unit.
Replace the battery.
Power the trip unit with external power or
by energizing the breaker for several days
to freshen the battery.
To Next Page
Loading...
Need help?
General
