Motor Rotates After Output Of Inverter Is Turned Off; Detects 0 V And Stalls When Motor Starts; 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 - Omron SYSDRIVE 3G3MV User Manual

Maintenance Operations
8-2-14 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 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 that the jump width settings in n083 through n085 for jump 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.
Inverter Does Not Run Because EF (Simultaneous
8-2-17
Inputs of Forward and Reverse Commands) is
Detected, Or Motor Rotates Momentarily When
Control Device Power is Turned OFF
Sequence Error
H
An EF will be detected if a forward command and a reverse command are input simulta-
neously for 0.5 seconds or longer. Correct the sequence
Chapter 8
.
8-27