straps on the four point ground fault terminal
block on the RD and SPB breakers are con-
nected D5 - D6 and D7 - D8.
Trip unit may be the problem.
Replace trip unit
Para. 5-3
Breaker trips too rapidly
Connection from C4 to C5 and/or
Replace connections
Table A.1
on ground fault or short
from D9 to D10 is missing on RD
Wiring Diagrams
delay (zone selective
or SPB breakers.
interlocking not used).
Connection from Z2 to Z3 and/or
Replace connections
Table A.1
Z4 to Z5 missing on DSII breakers.
Wiring Diagrams
Trip unit settings are not correct.
Change settings
I.B. 29C892, Section 3
or
I.B. 29C893, Section 4
Trip unit may be the problem.
Replace trip unit
Para. 5-3
Breaker trips too rapidly
Unpowered thermal memory can
If unpowered thermal memory is not required,
I.B. 29C892, Para. 3-6
on long delay.
cause breaker to trip too soon.
turn it off with the OPTIMizer.
Trip unit settings are not correct
Change settings
I.B. 29C892, Section 3
or
I.B. 29C893, Section 4
Trip unit may be the problem.
Replace trip unit
Para. 5-3
Power values are grossly
No voltage input to trip unit.
Check PT disconnect plug is installed.
Table A.1
in error. (1050 Trip Units
Wiring Diagrams
only)
Frequency incorrect
Verify operating frequency with OPTIMizer
I.B. 29C892, Para. 3-6
Trip unit may be the problem.
Replace trip unit
Para. 5-3
Zone selective interlocking
on ground fault and/or
See directions for checking zone selective interlocking
Appendix B
short delay does not work.
I.B. 29C891B
Page 52
Effective 11/98
Table 5.1 Troubleshooting Guide (continued from previous page)
Symptom
Probable Cause
Possible Solution(s)
References
Notes:
(1) OPTIM Trip Units are not replaceable on Series C LD and ND circuit breakers. Because replacing the complete circuit breaker is difficult,
consult the factory before attempting replacement.
Summary of Contents for Digitrip OPTIM 1050
Page 7: ......
