Troubleshooting
table (cont’d)
Problem (and system
status numbers)
Possible cause Action
Parameter checksum
error (F3)
Checksum fault reading NV
memory. Typically during
power cycle or after program
download.
Check for AC momentary
glitch. Do not interrupt
program or waveshape
download with keystroke or
power cycle.
Download a new parameter
set. Download a program
with a valid parameters
section.
Internal failure. Return to factory for repair.
Run time error (F4) Programming error. Read error number in Output
Window or check value of
Err in the variables window.
Look up values in run-time
error table and make
necessary corrections to your
program.
Processor failure ( ) Excessive noise in
application or internal
failure.
Cycle AC power.
Return to factory for repair.
Unit is enabled, no
system status faults
(status code 8), but
motor does not respond.
Seized load or excessive load
friction.
Reduce load.
Reset command on J4-7. Remove reset from J4-7.
No bus power. Apply bus power.
Open motor connections. Connect motor.
Motor oscillates or runs
erratically.
Improper shielding and
grounding.
Shield cabling correctly per
Section 2.5.1 or Section
2.5.2.
Improper drive set up. Review set up procedure.
MA950 5-11
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