GE Industrial Solutions Spectra RMS Molded Case - Manual (Page 50)

GEH-702 Users Manual
49
Appendix F. Replacing MicroVersaTrip ® with microEntelliGuard TM
There are occasions when a field update or repair will
require replacement of a Spectra RMS Molded Case
circuit breaker with a MicroVersaTrip
®
Trip Unit with a
Spectra RMS Molded Case circuit breaker with a
microEntelliGuard
TM Trip Unit. There are two cases
The new Spectra RMS Molded Case Circuit breaker with
microEntelliGuard
TM will be a direct replacement for the
old circuit breaker. A standard replacement procedure
can be used following all safety procedures.
to consider when performing this replacement . The
replacement procedures are described in this appendix.
For either case the first step is to identify the appropriate
Molded Case circuit breaker with microEntelliGuard
TM
Trip Unit to use in the replacement . The figure provides
a conversion map from a MicroVersaTrip
®
(MVT) to a
microEntelliGuard TM (MET). This figure only helps identify
an equivalent breaker. Should additional features be
desired during the replacement contact a GE sales
representative or distributor for assistance.
Figure 20. MicroVersaTrip ® vs. microEntelliGuard ™ Conversion
The first case to consider is a MicroVersaTrip ® unit that
does not use POWERLEADER TM communications. If the
trip unit does not use the Commnet communications
port for POWERLEADER
TM or other communications, the
replacement method is strictly a physical replacement.
Warning - High voltage and high currents are present
when working with circuit breaker replacement . Be
sure all power is removed before replacing the existing
circuit breaker. Before reapplying the power, be sure to
check the integrity of all connections.
The second case to consider is replacement of a
MicroVersaTrip
® breaker that is connected to a
communications port. When replacing a MicroVersaTrip ®
breaker that uses the communication port, minor wiring
updates are required. The block diagram in Figure 21
shows the typical MicroVersaTrip
® connection.
Figure 21. MicroVersaTrip ® Commnet Wiring
Figure 22. microEntelliGuard TM Modbus Wiring