I.L. 17562
Page 121
PR 0.3 Effective 8/99
running speed.
• Use DI 1 test to
confirm that the relay
sees the expected input
voltage.
REMOTE REMOTE TRIP Either or both of discrete
input 1 and/or discrete input
2 are set to indicate remote
trip contact input. The input
configured in this way was
energized with 120 Vac.
Determine the source of
the remote contact
operation requesting the
trip.
DIF TRIP DIFFERENTIAL TRIP 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 Vac.
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.
PH UNBAL PHASE UNBALANCE
TRIP
• Source voltage
unbalance due to
remote fault or single-
phase loading.
• Single phasing of the
motor.
• Check voltage
balance
• Check integrity of
feeder connections.
• Check fuses in starter.
• Do not attempt restart
until cause of single-
phasing is found.
PH REVRS PHASE REVERSAL
TRIP
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.
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 transformer
wiring by swapping the
current transformer
wiring terminals H1B-
H2B with H1C-H2C.
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