Baldor 18H Series Installation & Operating Manual page 92

Section 1
General Information
INDICATION
No Display Lack of input voltage.
Loose connections.
Adjust display contrast.
Auto Tune Encoder miswired.
Encoder Test failed Encoder Test failed
Encoder coupling slipping, broken
or misaligned.
Excessive noise on encoder lines.
Current Sense FLT Open circuit between control board
and current sensor.
Defective current sensor.
DC Bus High Excessive dynamic braking power.
Dynamic brake wiring problem.
Input voltage too high.
DC Bus Low Input voltage too low.
Encoder Loss Encoder power supply failure.
Encoder coupling slipping, broken
or misaligned
Excessive noise on encoder lines.
MN718
Table 5-2 Troubleshooting
POSSIBLE CAUSE CORRECTIVE ACTION
Check input power for proper voltage.
Verify fuses are good (or breaker is not tripped).
Check input power termination.
Verify connection of operator keypad.
See Adjust Display Contrast in Sec. 4.
Correct wiring problems.
Correct encoder to motor coupling.
Check the position counter in the Diagnostic Information for
jittering which will confirm an encoder problem.
Use recommended encoder cable.
Check encoder connections including shields.
Separate encoder leads from power wiring.
Cross encoder wires and power leads at 90 .
Electrically isolate encoder from motor.
Install optional Isolated Encoder Feedback expansion board.
Check connections between control board and current sensor.
Replace current sensor.
Increase the DECEL time.
Check dynamic brake watt and resistance parameter values.
Add optional dynamic braking hardware.
Check dynamic brake hardware wiring.
Verify proper AC line voltage.
Use step down isolation transformer if needed.
Use line reactor to minimize spikes.
Disconnect dynamic brake hardware and repeat operation.
Verify proper AC line voltage.
Use step up isolation transformer if needed.
Check power line disturbances (sags caused by start up of
other equipment).
Monitor power line fluctuations with date and time imprint
to isolate power problem.
Check 5VDC at J1-29 and J1-30.
Also check at encoder end pins D and F.
Correct or replace encoder to motor coupling.
Check the position counter in the Diagnostic Information for
jittering which will confirm an encoder problem.
Check encoder connections.
Separate encoder leads from power wiring.
Cross encoder wires and power leads at 90 .
Electrically isolate encoder from motor.
Install optional Isolated Encoder Feedback expansion board.
Troubleshooting 5-5