Eaton MP-3000 User Manual

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Page 12-5
Effective 10/02 IL17562BH04
Display
REMOTE
DIF TRIP
PH UNBAL
PH REVRS
T BYPASS
INCOM
STEX MMM
STEX T
Complete Help Message
REMOTE TRIP
DIFFERENTIAL TRIP
PHASE UNBALANCE TRIP
PHASE REVERSAL TRIP
TRIP BYPASS
INCOM REMOTE TRIP
MAX NUMBER OF STARTS PER
TIME REACHED, REMAINING
MINUTES ACTIVE SHOWN
STARTS PER TIME TRIP (log
display only)
Probable Cause
Either or both of discrete input 1
and/or discrete input 2 are set to
indicate remote trip contact input.
The input configure in this way was
energized with 120 Vac.
Either or both of discrete input 1
and/or discrete input 2 are set to
indicate differential trip contact
input from an external differential
relay. The input configured in this
way was energized with 120 Vax.
•Source voltage unbalance due
to remote fault or single-phase
loading.
•Single phasing of the motor.
At the time of starting, the phase
sequence was reversed.
The MP-3000 is set for non-
reversing starter; the motor is never
supposed to run backwards.
The MP-3000 tripped, yet contin-
ued to see current flowing to the
motor for more than a second after
the trip.
A remote PowerNet or other data
communications host requested a
motor trip.
Too many starts were performed in
the user-set period of time.
Solution
Determine the source of the remote
contact operation requesting the trip.
DANGER: Shut down and lock out
motor. A differential relay operation
indicates an electrical fault. Get expert
help in evaluating condition of motor
and repair needs. Do not try to restart
without expert evaluation.
After or during repair or replacement of
motor, check fuses in starter and
replace blown fuses.
•Check voltage balance
•Check integrity of feeder connections.
•Check fuses in starter.
•Do not attempt restart until cause of
single-phasing is found.
DANGER. Careless diagnosis and
correction could lead to starting the
motor in the wrong direction. The
cause is:
•Incoming source has swapped
phases. Swap two of the incoming
power leads L1, L2, or L3 to correct.
•Ct wiring has swapped phases.
Check wiring at Ct and relay end.
Change the MP-3000 current trans-
former wiring by swapping the current
transformer wiring terminals H1B-H2B
with H1C-H2C.
•Clearly mark the new wiring and
update the drawings for future
reference.
•Check motor for correct direction of
rotation at the moment of starting.
•The contactor or breaker is stuck or
jammed.
•Or, someone has bypassed the trip
contact so that the contactor re-
mained energized after the trip.
•Immediately open upstream source
breaker or loadbreak switch. Lock
out this switch and diagnose problem
or find bypass in starter.
Determine the cause of the remote trip.
Wait for the oldest start to clear from
the stack. Observe countdown on
display. See settings P5L1 and P5L2.

Eaton MP-3000 Specifications

General

Brand	Eaton
Model	MP-3000
Category	Relays
Language	English