MS6 REDUCED VOLTAGE STARTER
Page 19
6 FAULTS
Fault (display)
Description
IOC
Instantaneous Over Current
-
Current has reached a value of 1000% of stack size
-
Usually a short circuit on the output or misfiring of SCR’s
-
This fault cannot be disabled
MTR OVRLD
Motor Thermal Overload (calculated)
-
motor has been drawing over 100% of motor nameplate current
for a specified amount of time based on the class of overload
selected in group 15 parameter 2
-
after this fault has occurred the Opal Pro will not allow a reset
for approx. 6 minutes (this is to allow the motor to cool down)
-
this fault can be disabled in group 15 parameter 2
PHASE LOSS
Incoming Phase Loss
-
one of the incoming phases is missing or abnormally low
-
phase voltages can be read in group 1 parameters 2, 3, and 4
-
this fault will not be triggered until the motor is commanded to
start
-
this fault cannot be disabled
SHEAR PIN
Excessive Motor Current While Running
-
if the Opal Pro is phased fully on and the motor is up to speed
this fault will be triggered if the current goes above 300%
-
this fault can be disabled in group 15 parameter 1
SHORTED SCR
Shorted SCR Fault
-
this fault will not be triggered until the motor is commanded to
start
-
this fault cannot be disabled
HEAT SINK OT
Heat Sink Over Temperature
-
One of three temperature switches mounted on the heat sink has
been triggered
-
These switches trigger at approx. 85 degrees Celsius
-
The switches are only mounted on units which include fans
-
This fault cannot be disabled
COMM FLT
Communication Fault
-
a loss of communication between the Opal Pro and the master
device has been detected based on a watch dog bit that is sent
back an forth
-
this fault is disabled when no communication cards are installed
on the Opal Pro
-
this fault can also be disabled in group 15 parameter 3
-
the time delay for the watch dog bit can be set in group 15
parameter 4
POWERING UP
Power Up Sequence
-
the Opal Pro will be faulted for the first 6 seconds after the
120VAC control power is applied
-
this allows time for everything to initialize and then a fault reset
is automatically applied at the end of the 6 seconds
