8-27
8-2-14 Motor Rotates after Output of Inverter is Turned
OFF
·Insufficient DC Control
Ifthemotorcontinuesoperatingatlowspeed,withoutcompletelystopping,andafter
a deceleration stophasbeen executed, itmeans that theDC brakingis not deceler-
ating enough.
In such cases, adjust the DC control as described below.
S Increase the parameter in n089 for DC injection control current.
S Increase the parameter in n090 for DC injection control time.
8-2-15 Detects 0 V and Stalls when Motor Starts
·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 n091 for startup DC injection control time.
8-2-16 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 thatthejump width settingsin n083 throughn085 forjump frequencies 1
through 3 and jump width in n086 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 n011 ´ frequency reference upper limit in n033/100
Make sure that the parameters in n011 and n033 are correct.
8-2-17 Inverter Does Not Run Because EF (Simultaneous
Inputs of Forward and Reverse Commands) is
Detected, Or Motor Rotates Momentarily When
Control Device Power is Turned OFF
H Sequence Error
AnEFwillbedetectedifaforwardcommandandareversecommandareinputsimulta-
neously for 0.5 seconds or longer. Correct the sequence.
Maintenance Operations Chapter 8
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