SECTION 1 3-RMS-9
&
Epic MicroVersaTrip® Device (Cont.)
74
Since the neutral sensor is mounted separately from the
breaker, a disconnect means is required to connect its
output to the breaker. Fig. 86 shows the breaker and
equipment mounted 4th wire secondary disconnect used
with the R MS-9 system .
1 3.2.1
REPlACEMENT OF CURRENT SENSORS
Referring to Fig. 87B, replacement of RMS-9 & Epic
MicroVersaTrip current sensors is accomplished by the
same procedure as the MicroVersaTrip® current sensors.
1 3.3
FLUX SHIFTER TRIP DEVICE
The o n l y d ifference b etween t h e R M S- 9/E p i c
M icroVersaTrip® and SST flux shifter trip devices i s the
solenoid winding. Refer to Section 1 0.3 for details.
When replacing a RMS-9/Epic M icroVersaTrip@ flux
shifter, AMP extraction tool Cat. No. 455822-2 is required
to remove the socket leads from the AMP connector.
13.4
TROUBLESHOOTING
When malfunctioning is suspected , the first step in
troubleshooting is to examine the circuit breaker and its
power system for abnormal conditions such as:
a) Breaker tripping in proper response to overcurrents
or incipient ground faults.
b) Breaker remaining in a trip-free state due to me-
chanical maintenance along its trip shaft.
c) Inadvertent shunt trip activations.
WARNING:
Do not adjust the programmer unit set
knobs while the breaker is carrying current.
Once it has been established that t
h
e circuit breaker
can be opened and closed normally from the test position ,
attention can be directed to the trip device proper. Test
ing is performed by either of two methods:
1 . Conduct high-current, single-phase tests on the
breaker using a high current-low voltage test set.
NOTE:
For these single phase tests, special connec
tions must be employed for RMS-9 breakers equipped
with Ground Fault. Any single-phase input to the
programmer circuit will generate an unwanted "ground
fault" output signal which will trip the breaker. This
can be nullified either by
a) Using the Ground Fault Defeat Cable as shown in
Fig. 93. This special test cable energizes the pro
grammer circuit in a self-cancelling, series-parallel
connection so that its output is always zero.
2 . Test the components of the R MS-9 system using
portable Test Set Type. The applicable test procedures
are detailed in instruction Book GEK-97367.
The time-current characteristics for the R MS-9 & Epic
M icroVersaTrip® Device are g iven in curves GES-6229
and G ES-6228.
FIG.
104 -
TEST SET, CAT. NO. TVRMS
13.4.1
RESISTANCE VALUES
For use in troubleshooting the R MS-9 current sensors,
the resistance of the fixed windings is g iven in Table 1 5.
TABLE
1 5 - FIXED SENSOR
RESISTANCE VALUES
Ampere
Resistance in Ohms
Rating
Between Terminals
1 50
1 0-1 2
400
27-32
800
58-68
1 600
1 29-1 5 1
2000
207-243
The coil resistance of the RMS-9
&
Epic MicroVersaTrip®
device is approximately 7 ohms.
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