When The Motor Does Not Accelerate - Mitsubishi Electric FATEC FR-A800 Manual

5
BREAKDOWN MAINTENANCE
5.1.4

When the motor does not accelerate

The motor does not accelerate.
NO
3-B
It does not start.
YES
3-C
Accelerated.
To middle or high speed
The load is large due to fans,
pumps, or agitators.
Review the capacity of
the inverter and motor.
NO
Set (input) the
speed correctly.
NO
Clear all parameters, and set
the following parameters again.
G000 (Pr.0): Torque boost
H400 (Pr.1): Maximum frequency
F102 (Pr.13): Starting frequency
G001 (Pr.3): Base frequency
G003 (Pr.14): Load pattern selection
H500 (Pr.22): Stall prevention
operation level
The inverter is faulty.
Replace it with a substitute or
return it to the factory to repair.
Does the
motor start?
YES
Has the motor
accelerated so far?
NO
YES
Which
step does the
motor accelerate
to?
To low speed only
YES
Does OC or OL
alarm occur?
NO
Is the speed
signal correct?
YES
Is the Pr.
setting correct?
YES
4-B
It does not accelerate.
Is
the magnetic flux
vector selected?
NO
Can
YES
the magnetic flux
vector be selected?
NO
Is G003 (Pr.14) Load
YES
pattern selection set to
variable-torque?
NO
Is the
YES
stall prevention
level 150% or
less?
NO
Can the
YES
acceleration time
be lengthened?
NO
YES
Can the load
be reduced?
NO
YES
Is the vector
motor used?
NO
Is the SF-HR NO
or HRCA used?
SF-JR
YES
Increase the torque boost
Increase the capacity of Up to 8% can be set in G000 (Pr.0).
If it is increased too much, OC occurs.
the inverter or the motor.
5.1 Troubleshooting
4-A
Review the control.
Select the magnetic flux vector
control, and perform offline
auto tuning.
Select the constant torque
pattern for the load pattern
selection. G003 (Pr.14)=0
Increase the stall prevention
level H500 (Pr.22).
Be careful not to increase the
level too much because the OC
alarm occurs.
Set the acceleration time longer.
Reduce the load.
Consider using a
vector inverter.
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