Specifications

33
© 2012 Emerson Climate Technologies, Inc.
Printed in the U.S.A.
AE8-1368 R2
Locked Rotor Trip / Lockout
Normal Operation
Perform normal locked
rotor diagnosis (voltage,
valve plate, etc)
A detected locked rotor condition (at start-up or while running) will shut the compressor off for
5 minutes. After 5 minutes, an attempt will be made to run again if demand is still present.
After 10 consecutive locked rotor trips, the control module will transition to a LOCKOUT
condition A reset is necessary in order for the module to run again.
If the compressor is locked out, RESET the module to enable it to run again.
Does the compressor appear
to start before the control
module shuts it down for
locked rotor?
Does the compressor continue
to draw high (above MCC)
current even though it
appears to start?
Temporarily
disconnect the
communication
line to the sensor
module (at the
sensor module or
at the control
module)
Does the compressor start?
(unplugging the comm line
disables this protection
feature)
Electrical or
mechanical fault
with compressor or
system
Compare locked rotor and
running AMPS history at
the E2 for this compressor
vs others. If the
compressor current > 25
amps when the
compressor is off, the CT
or sensor module has
failed. Replace the CT if
the displayed values are
significantly different from
an independent amp
clamp.
No
Yes
No
Yes
No
Normal Operation
perform normal
locked rotor
diagnosis (voltage,
valve plate, etc)
Yes
Note: This locked rotor value is the
peak locked rotor amperage
recorded for this start cycle. It will
typically be much greater than the
listed locked rotor value which is a
steady-state RMS value
6.13