Technical information

7 – TROUBLESHOOTING
96
7.1 General Troubleshooting Charts
The following troubleshooting charts can be used to help solve many of the more common problems that may occur.
7.1.1 Motor does not start, no output to motor
Condition Cause Solution
Control voltage absent. Check for proper control voltage
input. Verify fuses and wiring.
Display Blank, CPU Heartbeat LED
on MX card not blinking.
MX control card problem. Consult factory.
Fault Displayed. Fault Occurred. See fault code troubleshooting table
for more details.
Start/Stop control input problems. Verify that the start/stop wiring and
start input voltage levels are correct.
Start command given but nothing
happens.
Control Source parameters
(P4/QST04 and P5/QST05) not set
correctly.
Verify that the parameters are set
correctly.
Check input supply for inline
contactor, open disconnects, open
fuses, open circuit breakers, or
disconnected wiring.
Verify that the SCR gate wires are
properly connected to the MX control
card.
On medium voltage systems, verify
wiring of the voltage feedback
measurement circuit.
noL or No Line is displayed and a
start command is given. A Fault 28
occurs.
The MX control card has not detected
line voltage when given a start.
See fault code troubleshooting table
for more details.