When The Motor Speed Does Not Become The Set Speed - Mitsubishi Electric FATEC FR-A800 Manual

5
BREAKDOWN MAINTENANCE
5.1.5

When the motor speed does not become the set speed

The motor speed does not reach the set speed.
4-B
It does not accelerate.
7-A
It does not decelerate.
Is
the maximum
frequency
low?
YES
6-A
The speed is unstable.
Set it again after
Pr. all clear.
5.1 Troubleshooting
56
Does the
motor accelerate
normally?
NO
YES
Does the
motor decelerate
NO
normally?
YES
Is the speed
command set
correctly?
YES
NO
Is the running
speed higher than
the set speed?
YES
Is
YES
the minimum
frequency
high?
NO
NO
Analog
Which speed
command method
is used?
Digital
YES
Does OL
alarm occur?
Review the control.
NO
NO
Is the
speed stable?
YES
User's measuring
instrument
Monitor the inverter.
NO
Is the Pr.
setting correct?
YES
The inverter is faulty.
Replace it with a substitute
or return it to the factory to repair.
NO
Can the
frequency setting
be written?
NO
Parameter setting 2-A
Set the minimum frequency
H401 (Pr.2) correctly (low).
Were Pr.900s
calibrated?
YES
4-A
Is the
speed difference
large?
YES
Is the
YES
measurement
method correct?
NO
Review the measurement
method.
YES
Write the output
frequency correctly.
NO
Calibrate Pr.900s
correctly.
NO
Within the slip
Is the V/F
YES
control used?
V/F
NO
Magnetic flux vector
Sensorless vector
YES
Is online auto
tuning selected?
NO
Calibrate Pr.900s
correctly.
Normal