I.B. 29C891B
Page 12
Effective 11/98
2-5.1 R-FRAME, SPB AND DSII/DSLII OPTIM TRIP
UNIT DISPLAYS
Readings are not displayed and protective settings are
not established or adjusted from the front of Digitrip
OPTIM Trip Units. These functions are carried out
through the use of one or more of the following means:
• OPTIMizer Hand Held Programmer
• Breaker Interface Module
• Remote Computer/IMPACC software
The R-Frame, SPB and DSII/DSLII OPTIM Trip Unit dis-
plays all provide the following features (Figure 2-10):
Push-To-Trip Button
A Push-To-Trip (Push-To-Open on SPB) button pro-
vides a local manual means for checking the circuit
breaker’s mechanical tripping function and periodically
exercising the operating mechanism. This pushbutton is
accessible from the front of the R-Frame, SPB and
DSII/DSLII circuit breakers.
Mode of Trip/Alarm Indicators
Four LED type indicators (long delay, short delay,
instantaneous and ground fault trip or ground fault
alarm) are provided to indicate the mode of trip after an
automatic trip. The appropriate LED is lit red when acti-
Figure 2-8 OPTIM Trip Unit Mounted in SPB Circuit
Breaker
vated. The LEDs are presented in the form of a mimic
time-current curve on the front of the OPTIM Trip Unit.
Notice: Trip unit indicators should be powered from a
control power source wired externally to the
circuit breaker or alternatively via battery locat-
ed in the trip unit. For connection to an exter-
nal control power source, refer to the wiring
diagrams listed in Appendix A, Table A.1.
Battery for Trip Indicators
A replaceable 3 volt lithium battery is located behind the
hinged cover of the rating plug (Figure 2-11). A test
pushbutton and LED test indicator are also provided.
The test pushbutton will energize the LED indicator if
the battery is in good working condition. Refer to para-
graph 5-4.1 for battery replacement information.
Trip Indicator Reset Pushbutton
A trip reset pushbutton is provided to turn off a mode of
trip LED indicator after an automatic trip. The reset push-
button is located directly under the programming port.
Notice: For SPB and DSII/DSLII circuit breakers, this
pushbutton also functions as a trip lockout
reset. It must be pressed after an automatic
trip to reset the trip unit.
Figure 2-9 OPTIM Trip Unit Mounted in DSII Circuit
Breaker
Push-To-Trip Button
Push-To-
Open
Button
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