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NFX9000 Adjustable Frequency Drives
A-2
For more information visit: www.EatonElectrical.com
MN04002003E
February 2006
Table A-1: Common Problems and Solutions, Continued
Fault
Name Fault Description Corrective Action
ocA Over-current during acceleration:
• Short circuit at motor output
• Torque boost too high
• Acceleration time too short
• Drive’s output capacity too small
1. Make sure the insulation is adequate at the output
line.
2. Decrease the torque boost setting in parameter
7-02.
3. Increase the acceleration time.
4. Replace the drive with one that has a higher
output capacity (next level hp).
ocd Over-current during deceleration:
• Short circuit at motor output
• Deceleration time too short
• Drive’s output capacity too small
1. Make sure the insulation is adequate at the output
line.
2. Increase the deceleration time.
3. Replace the drive with one that has a higher
output capacity (next level hp).
ocn Over-current during steady-state
operation:
• Short circuit at motor output
• Sudden increase in motor loading
• Drive’s output capacity too small
1. Make sure the insulation is adequate at the output
line.
2. Check for possible motor stall.
3. Replace the drive with one that has a higher
output capacity (next level hp).
cF1 Internal memory IC cannot be
programmed
1. Switch off power supply.
2. Make sure the input voltage falls within the drive’s
input voltage rating range.
3. Switch on the drive.
cF2 Internal memory IC cannot be read 1. Check the connections between the main control
board and the power board.
2. Reset drive to factory defaults.
cF3 Drive’s internal circuitry abnormal 1. Switch off power supply.
2. Make sure the input voltage falls within the drive’s
input voltage rating range.
3. Switch on the drive.
HPF Hardware protection failure Consult Eaton.
codE Software protection failure Consult Eaton.
cFA Auto acceleration/deceleration failure Do not use the auto accel./decel. function.
CE1 Communication error 1. Check the connection between the drive and
computer for loose wires.
2. Make sure the communication protocol is properly
set.
bb External base block
(When the external input terminal
(BB) is active, the drive output will be
turned off.)
Disable the connection between external input
terminal (BB) and the drive. The drive will begin to
run again.
oL Drive detects excessive drive output
current
1. Check whether the motor is overloaded.
2. Reduce torque compensation setting set in
parameter 7-02.
3. Increase the drive’s output capacity.
Note: The drive can withstand up to 150% of the
rated current for a maximum of 60 seconds.
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