Eaton MP-3000, Manual

Page: 120 / 123

Page 120
I.L. 17562
PR 0.3 Effective 8/99
(emptied) below the user-set
I2T alarm level. This time
depends on motor
nameplate values entered
as setpoints. in supply currents or
voltages causing
negative-sequence
heating.
•
Check for abnormal
system voltage level.
•
Check for cooling air
blockage or abnormal
ambient.
INC SEQ INCOMPLETE
SEQUENCE TRIP Discrete input 2 has been
set for the incomplete
sequence timing function
via setpoint P7L1. The 120
Vac feedback signal from
the process or starter,
expected within the user-set
time delay, was not
received in time after the
start or transition.
Also, the discrete input 2
must remain energized
during the run cycle, until
the motor stops. An
interruption over 25 cycles
will cause an incomplete
sequence trip.
•
Check to be sure this
function has been
intentionally enabled.
•
Check process
feedback wiring to be
sure 120 Vac signal is
delivered in the
expected time.
•
Use DI 2 test to
confirm that relay sees
input.
•
Check setpoint P5L8
against process
feedback time.
•
Check setpoint P5L9
to be sure correct timing
start point is selected -
start or transition.
•
If timing from
transition, be sure
transition current and
time settings are correct.
ZSW TRIP ZERO SPEED SWITCH
INPUT FAILED TO BE
FALSE WITHIN 1/2 OF
LOCKED ROTOR TIME,
OR WAS FALSE AT
START. Discrete input 1 has been
set for zero-speed switch
sensing via setpoint P6L1.
The 120 Vac zero speed
switch contact input was not
present at the moment of
the start; or it did not go
away in one-half of the set
locked rotor or stall time
P1L3. This may be due to a
motor which is unable to
start spinning when it is
energized.
•
Check to be sure this
function has been
intentionally enabled.
•
If ZSW trip occurs at
the moment of starting,
check process wiring
and contact to be sure
120 Vac signal is
delivered to DI 1 when
the motor is stopped.
•
Check to be sure the
motor isn't stalled and
actually begins to spin.
•
If ZSW trip occurs
after 1/2 the locked rotor
time setting, check to be
sure the contact on the
motor opens and the 120
Vac signal goes away
before this time.
Usually, a zero-speed
switch should open when
the motor has reached
5% to 10% of its normal