Speed Command Does Not Match Motor Speed; Speed Control - Mitsubishi Electric FR-V520-1.5K to 55K Instruction Manual

Troubleshooting
6.4.6

Speed command does not match motor speed

(1) Speed control

The speed command does
not match the motor speed.
Does the speed command
from the command device
match the motor speed?
Does the inverter's speed
command match the motor
speed?
Does the speed command
match the inverter's speed
command?
Please contact your sales
representative.
N
Have you set the
motor type?
Set the motor (Pr. 71).
Y
N
Is the PLG setting
correct?
Make the PLG setting
correctly.
Y
N
1) Check that the command device
is not faulty.
Y
2) The command is compounded with
noise (check the shielding and wiring.)
N
The number of PLG pulses
(Pr. 851) is wrong.
Y
Set the number of PLG
pulses.
N
Set the speed command
bias and gain
(Pr. 902, Pr. 903).
Y
Does the speed remain
Y
unchanged if it is
increased?
1) Torque is insufficient.
Increase the torque restriction
N
value as the torque restriction
value is exceeded.
2) Check that the speed control
proportional gain (Pr. 820)
is not 0.
3) Increase the motor and
inverter capacities as they
are insufficient.
89