2–20 Troubleshooting and Error Codes
Publication 1336 IMPACT-6.2 – March 1998
If you are having problems with encoderless mode, refer to this table
for possible solutions before calling for help.
Table 2.G
If:
Then you should:
The motor will not accelerate or
does not start smoothly
• Increase the bandwidth in Spd Desired BW (parameter 161). If the bandwidth is too
low, the motor may not accelerate, although the current increases to current limit.
• If the regen power limit is 0, increase it to at least –5%.
• Increase the torque and current limits to the maximum.
• Increase the value of Kp Freq Reg (parameter 178).
The motor oscillates after it is
up to speed
• Decrease the bandwidth in Spd Desired BW (parameter 161) if the process will allow.
If this does not help, depending on your application, you need to either increase or
decrease the value of Error Filter BW (parameter 162).
The inverter trips on absolute
overspeed during starting
• Increase the acceleration time.
• If the overspeed occurs during a fast acceleration, increase the value of Kp Freq Reg
(parameter 178) until the trip stops occurring.
• Increase the bandwidth in Spd Desired BW (parameter 161).
• If the overspeed occurs during a reversal, increase the deceleration time (slower
deceleration).shippshippy
Encoderless
Troubleshooting
Procedures
AB Spares
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