Diagnostic & Troubleshooting 6 - 24
If the Motor Rotates Even When Drive Output is Stopped
If the motor rotates even when the Drive is stopped, the DC injection braking may be insufficient. If the motor continues
operating at low speed, without completely stopping after a stop has been executed, it means that the DC injection braking is
not decelerating the motor enough. Adjust the DC injection braking as follows:
•
Increase the parameter b2-04 (DC Injection Braking (initial excitation) Time at Stop) setting.
•
Increase the parameter b2-02 (DC Injection Braking Current) setting.
If Zero Volts is Detected When a Motor is Started, or Stalls
Generation of 0 V (main circuit voltage) and stalling can occur if a motor is turning when it is started and the DC injection
braking is insufficient.
This can be prevented by slowing motor rotation by DC injection braking before starting. Increase parameter b2-03
(DC injection braking time at start) setting.
If the Accepted Speed Command Does Not Rise to the User Speed Command
Input
The Speed Command is within the jump frequency range.
When the jump frequency function is used, the output frequency can not be set within the jump frequency range. Check to
be sure that the Jump Frequency (parameters d3-01 to d3-03) and Jump Frequency Width (parameter d3-04) settings are
suitable.
The frequency reference upper limit has been reached.
The output frequency upper limit is determined by the following formula:
Freq Ref Upper Limit = Maximum Output Frequency (E1-04)
×
Frequency Reference Upper Limit (d2-01) / 100
Check to be sure that the parameter E1-04 and d2-01 settings are suitable.
Summary of Contents for E7LBA002
Page 1: ...E7L Drive Bypass Technical Manual Model E7L Document Number TM E7L 01 ...
Page 8: ...Introduction vi Notes ...
Page 12: ...Table of Contents x Notes ...
Page 54: ...Electrical Installation 2 22 Wiring Diagram ...
Page 55: ...Electrical Installation 2 23 ...
Page 87: ...Start Up and Operation 4 9 Notes ...
Page 202: ...Diagnostic Troubleshooting 6 30 Notes ...
Page 248: ...Capacity Related Parameters B 6 Notes ...
Page 279: ...Communications D 27 Note ...
Page 280: ...Communications D 28 ...
Page 292: ...Spare Parts F 6 ...
Page 304: ...Index 12 ...
Page 305: ......