GE Industrial Solutions EntelliGuard TU Trip Units - Manual (Page 27)

DEH-4567B EntelliGuard TU Trip Units: UL/ANSI Models
Protection
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If the GTU BIM ID (Breaker Serial Number) is NON-ZERO
• Upon power-up the trip unit reads BIM ID
• If there is no match:
o Breaker trips Note: Software Revision 08.00.23
and great, If a BIM read fails the trip unit will not
trip the breaker, instead it will modify its internal
configuration to match the AIC rating of the least
capable breaker in the family. The trip unit will
periodically read the BIM after that, and on a
successful match the original settings will be
restored. While the BIM error persists a BIM Err
message will be displayed on the LCD.
o GTU shows BIM ID Mismatch Error
o GTU registers a BIM Trip Event
Under certain circumstances, it is possible to reconfigure a
trip unit so that it can be installed in a different circuit
breaker. This involves “divorcing” the BIM and trip unit so
that the trip unit can be “married” to a different circuit
breaker.
BIM Remarry Sequence:
1. Install the trip unit on the target breaker. On power up
the breaker will be tripped due to BIM error.
2. BIM mismatch will be indicated.
3. Press Right + Left + Up simultaneously.
4. “BIM OK” will flash in the upper left corner of the LCD
display if marry succeeded
5. “BIM ERROR” will show if the marry failed.
Upon execution of the procedure, GTU will upload the data
if the breaker is open and the following data in the BIM
matches the GTU data programmed in the factory:
• Sensor
• Standard (UL/ANSI/IEC)
• MCR
• HSIOC
• Breaker interruption rating (Frame)
If there is no match, BIM Data mismatch error will show.
Otherwise, continue normal operation.
PROTECTIVE RELAYS
The protection relay can be set to cause either a trip or an
alarm. If the PR Enable on the LCD is set to ON, a trip will be
generated, if set to OFF an alarm will be generated. The
alarms can provide external indication by using the digital
output contacts. See “Output Relays,” below, about output
contact behavior.
Voltage Unbalance
This function compares the highest or lowest phase
voltage with the average of all three phases and initiates a
trip if the difference exceeds the set point.
Table 2-10: Voltage Unbalance Settings
Item Option
Voltage unbalance
pickup Adjustable from 10% to 50%
in increments of 1%.
Voltage unbalance
delay setting Adjustable from 1 sec to
15 sec in increments of 1 sec.
Setting this value to OFF
disables this function.
Current Unbalance
This function compares the current in the highest or lowest
phase with the average of all three phases and initiates a
trip if the difference exceeds the set point.
Table 2-11: Current Unbalance Settings
Item Option
Current unbalance
pickup Adjustable from 10% to 50%
in increments of 1%.
Current unbalance
delay setting Adjustable from 1 sec to
15 sec in increments of 1 sec.
Setting this value to OFF
disables this function.
Undervoltage Relay
This function measures the voltage in all phases and
initiates a trip if any phase voltage drops below the set
point. This internal trip unit relay feature operates
independently of any separately installed undervoltage
Relay Accessory on the circuit breaker.
Table 2-12: Under Voltage Settings
Item Option
Under voltage
pickup Adjustable from 50% to 90% in
increments of 1%.
Under voltage
delay setting: Adjustable from 1 sec to 15 sec in
increments of 1 sec. Setting this value
to OFF disables this function.
Zero Voltage Trip
“Trip on Zero Volts” is a setpoint that defines the operation
of the UVR relay on a “dead bus”. It determines whether the
protective relay UVR trip unit function trips or not when all
three phase voltages drop to zero.
Overvoltage Relay
This function measures the voltage in all phases and
initiates a trip if any phase voltage exceeds the setpoint.
See Table 2-13.