2–22
Troubleshooting and Error Codes
Publication 1336 IMPACT-6.8 – November, 2002
If:
Then you should:
The motor reduced the speed range.
•
Check SP An In1 Scale (parameter 135) or SP An In2Scale (parameter 138) if your
speed input is coming from the HIM pot.
•
Check An In 1 Offset (parameter 97), An In 1 Scale (parameter 98), An In 2 Offset
(parameter 100), An In 2 Scale (parameter 101), mA Input Offset (parameter 103), and
mA Input Scale (parameter 104) if your speed input is coming from the analog inputs.
•
Check Speed Scale 1 (parameter 30) or Speed Scale 7 (parameter 37).
•
Check Absolute Overspd (parameter 24).
•
Check Min Speed Limit (parameter 215).
If you are having problems with encoderless mode, refer to this table
for possible solutions before calling for help.
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).
Encoderless
Troubleshooting
Procedures
Содержание Allen-Bradley IMPACT 1336 Series
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