GE Industrial Solutions Spectra RMS Molded Case - Manual (Page 19)

18
GEH-702 Users Manual
INST Pickup Setting = 9.0
INST Trip Value = 800 amps x 9.0 = 7,200 amps
Instantaneous Pickup (Standard)
This set point is used to establish the ampere value
that immediately causes the breaker to trip. The
instantaneous trip value is calculated by multiplying
the setting value times the breaker sensor value. The
available range of instantaneous pickup values are
shown below. Maximum settings are dependent on
breaker frame and sensor rating:
Table 16. Available Instantaneous Pickup
Breaker Interrupt
Tier
Sensor /
CT
MIN
INSTPU
Max
INSTPU
Spectra G H, L, P All 2.0 10.0
Spectra K H, L, P All 2.0 10.0
T, S 800 2.0 25.5
1000 2.0 20.5
1200 2.0 17.0
Reference Appendix A: Table 27 for Instantaneous Pickup increments
Example:
Breaker Sensor “S” = 800 amps
Figure 13. Instantaneous Pickup
Reduced Energy Let-Through (RELT) Instantaneous
Pickup (Optional)
This set point is used to establish the ampere value that
immediately causes the breaker to trip when the
breaker/trip unit is set to the RELT mode via an input
signal or communications. The RELT instantaneous trip
value is calculated by multiplying the setting value
times the breaker sensor value. The available range
of RELT instantaneous pickup values is 1.5 to 10.0 in
increments of 0.5.
Ground Fault Pickup (Trip or Alarm) (Optional) This
set point is used to establish the ampere value that
causes the breaker to trip/alarm under a ground fault
condition. Trip units can be optioned to have either
ground fault TRIP or ground fault ALARM. When
optioned with ground fault TRIP, the breaker will trip
when a ground fault is sensed and exceeds the setup
parameters. When optioned with ground fault ALARM,
the breaker will not trip when a ground fault is sensed
and exceeds the setup parameters. Instead, a set of
output contacts will change state allowing signaling
to an external control device (output contacts require
the proper terminal board or junction box accessory).
The ground fault trip/alarm value is calculated by
multiplying the setting value times the circuit breaker’s
sensor value “S”. The available range of ground fault
trip/alarm values is 0.40 to 1.0 in increments of 0.01.
Example:
Breaker Sensor “S” = 1200 amps
GF Pickup Setting = 8.0
GF Trip Value = 1200 amps x 8.0 = 9,600 amps
Figure 14. Ground Fault Pickup