7-17
7-2-11 Motor Rotates after Output of Inverter is Turned
Off
•Insufficient DC Control
If
the motor continues operating at low speed, without completely stopping, and after
a
deceleration stop has been executed, it means that the DC braking is not deceler
-
ating
enough.
In such cases, adjust the DC control as described below.
S Increase the parameter in n52 for DC injection control current.
S Increase the parameter in n53 for DC injection control time.
7-2-12 Detects 0 V when Motor Starts and Motor Stalls
•Insufficient DC control at startup
Generation of 0 V and stalling can occur if the motor is turning when it is started.
This can be prevented by slowing the rotation of the motor by DC braking before
starting the motor.
Increase the parameter in n54 for startup DC injection control time.
7-2-13 Output Frequency Does Not Reach Frequency
Reference
•The frequency reference is within the jump frequency range.
If the jump function is used, the output frequency stays within the jump frequency
range.
Make
sure that
the jump width settings in n49 through n50 for jump frequencies 1 and
2 and jump width in n51 are appropriate.
•The preset output frequency exceeds the upper-limit frequency.
The upper-limit frequency can be obtained from the following formula.
Maximum frequency in n09 × frequency reference upper limit in n30/100
Make sure that the parameters in n09 and n30 are correct.
Maintenance Operations Chapter
7
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