Msc-3 Trouble Shooting Guide - Zener MSC-3 Instruction Manual

MSC-3 Start Up

MSC-3 Trouble Shooting Guide

Symptom
Front Display does not
illuminate.
Motor does not rotate
when UP button on the
Console is pressed.
Motor does not rotate
when remote START
signal is activated.
Motor does not
accelerate in the time
set by the ACCEL ramp
and C LIMIT message
appears .
C LIMIT message
appears continuously
136
Cause
Input power wiring not
connected properly.
Input voltage not within
specification.
Enable signal is not active.
MSC-3 is in REMOTE
Speed is set to minimum
Incorrect control signal
wiring.
Enable signal is not active.
MSC-3 is in LOCAL
A direction has not been
selected.
Speed signal is not correctly
connected.
Current limit circuit is
operating.
CURRENT LIM set too low.
Motor mechanically
overloaded.
Motor shaft jammed.
Fault in motor or motor
wiring.
Incorrect motor voltage
selected.
Incorrect motor frequency
selected.
FLUX PLUS is set too high.
IM00120 IM00120
Remedy
Check input power wiring, refer to the
MSC-3 Electrical Installation Diagram.
Measure the input voltage at the MSC-3
input terminals. Check with specifications.
Check that the EN terminal is connected to
+5V. Check that the ENABLED message is
displayed.
Check that if you have a remote terminal it is
not at +5V with respect to DIG COM.
Increase speed by holding down the UP
button.
Check control wiring to terminals and
the terminal functions assigned. Refer
to Control Wiring Diagrams and Terminal
Configurations.
Check that the EN terminal is connected to
+5V. Check that the ENABLED message is
displayed.
Check that your remote terminal is at +5V
with respect to DIG COM.
Check that either a FWD or a REV terminal
has been assigned and that it is at +5V with
respect to DIG COM.
If the reverse direction is selected ensure that
reverse is enabled from the Protection menu.
Check the REMOTE speed source in the
References menu. Ensure that this source is
not at zero.
This is a normal operating mode for the
MSC-3. When the load is being accelerated
too fast, the MSC-3 limits current drawn
by the motor by extending the acceleration
ramp time. A faster Accel time is not possible
with this Current Limit setting. Increase the
ACCEL time until the C LIMIT message
disappears
Increase CURRENT LIM value so that the
MSC-3 is not prematurely limiting current.
Check that the motor does not overheat with
the new setting.
Check the actual load is within the motor's
capacity at the required speed.
Check the mechanical drive system.
Check that motor is wired correctly.
Enter correct MOTOR VOLTAGE from the
MOTOR menu
Enter correct MOTOR FREQUENCY from the
MOTOR menu.
Reduce the FLUX PLUS setting.