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8 - TROUBLESHOOTING & MAINTENANCE
General Troubleshooting Charts
8.4
General Troubleshooting Charts
The following troubleshooting charts can be used to help solve many of the common issues that may occur.
8.4.1
Stack Overtemp Lockout
Stack Overtemp
Lockout
Condition
Cause
Factory Reset in (FUN 22) was entered.
Display screen displays what is shown
above.
Fiber Optic connections (FS1, FS2 or
FS3) are not connected on the bottom of
the I/O board or to each gate driver card.
8.4.2
Display screen displays what is shown
above plus (Green / LED3) on driver
card is NOT lit.
J3 connection (Stack OT) on the upper
right hand corner of any 3 gate driver
cards is bad.
Display screen displays what is shown
above plus any of the (Green / LED 3,
4, 5, 6) are NOT lit.
Fiber Optic connections are bad.
Solution
Enter the equipment specified rated
voltage in Rated Voltage (FUN05).
Enter the value of the CTs supplied with
the MVRMX3 into the CT Ratio parameter
(FUN 03).
Set DI #2 - (I/O02) to "inline confirm".
Set DI #3 - (I/O03) to "disconnect".
Set Relay #3 - (I/O12) to "running".
Reconnect the Fiber optics.
Reconnect the two wires into the J3
connection.
Check Power Supply
Check for damaged fiber optic cables.
Check for bad connections.
Motor does not start, no output to motor
Condition
Cause
Solution
Display Blank, CPU Heartbeat LED on
MX3 board not blinking.
Control voltage absent.
Check for proper control voltage input.
Verify fuses and wiring.
MX3 control board problem.
Consult factory.
Fault Displayed.
Fault Occurred.
See fault code troubleshooting table for
more details.
Start command given but nothing
happens.
NOL or No Line is displayed and a start
command is given, it will fault in F28.
Start/Stop control input problems.
Control Source parameters (QST 04 - 05)
not set correctly.
No line voltage has been detected by the
MX3 when a start command is given.
Verify that the start/stop wiring and start
input voltage levels are correct.
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 MX3 control
board.
On medium voltage systems, verify wiring
of the voltage feedback measurement
circuit.
See fault code troubleshooting table for
more details.
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