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

5
BREAKDOWN MAINTENANCE
5.1.7

When the motor does not accelerate

The motor does not decelerate to a stop.
Does OV
alarm occur?
Does OL
alarm occur?
Does the
motor decelerate
partway?
Is the load
fluctuation
large?
YES
Check the load.
Is positioning
required?
Does an
overrun occur?
Is the
current speed the
creep speed?
NO
Review the starting point of
deceleration, or shorten the
deceleration time.
Can the
creep speed be
YES
reduced?
Reduce the creep speed.
Review the system since
the accuracy is strict.
5.1 Troubleshooting
58
YES
NO
YES
NO
NO
Are the
YES
deceleration and
stop commands
commanded?
YES
Is the motor
coasting?
NO
Motor coasting
Check the power supply voltage,
MRS, and RES signals.
NO
YES
YES
Has the DC injection
brake operation
Pr. been set?
NO
Adjust the DC injection
brake operation related Pr.
YES
NO
S-pattern acceleration
NO
command method
YES
speed command
turn OFF for a
NO
NO
Stabilize the
speed command.
7-A
It does not decelerate.
12-A
Braking capability
prevention level 150%
NO
Is the SF-HR
or HRCA used?
Input the deceleration
and stop commands.
Continuous
operation
deceleration time be
lengthened?
Can GD2 be
Increase the capacity of the inverter or the motor.
The inverter is faulty.
Replace it with a substitute or
return it to the factory to repair.
Is the
/deceleration
selected?
YES
YES
Is the speed
analog?
NO
Does the
Take countermeasures
against the noise.
moment?
Insert the cut core into input.
YES
Increase the input filter time
constant T002 (Pr.74).
Is the stall
YES
or less?
NO
Increase the stall prevention level
H500 (Pr.22). Be careful not to
increase the level too much
because the OC alarm occurs.
NO
SF-JR
Increase the torque boost
YES
Up to 8% can be set in G000 (Pr.0).
If it is increased too much,
OC occurs.
Can the
YES
NO
Set the deceleration time F011 (Pr.8) longer.
YES
reduced?
NO
Reduce GD2.