When Automatic Restart After Instantaneous Power Failure Does Not Work - Mitsubishi Electric FATEC FR-A800 Manual

5
BREAKDOWN MAINTENANCE
5.1.8 When automatic restart after instantaneous power failure does not
work
The automatic restart after instantaneous power failure does not work.
Are the related
Pr.s set correctly?
CS terminal ON?
(STR) terminal
restart method is used?
YES
instantaneous power
failure time 0.2 second
YES
NO
Is starting
from 0 Hz
OK?
YES
NO
Can A703 (Pr.58)
Restart cushion time
be lengthened?
YES
Lengthen A703 (Pr.58)
Restart cushion time.
YES
speed search be
Change the inverter model.
Select the speed search
method by setting "0" in A700
(Pr.162).
NO
A702 (Pr.57): Set the restart coasting time to value other than 9999.
YES
A703 (Pr.58): Set the restart cushion time to 1.0 second or more.
F010 (Pr.7): When the acceleration time is long, lengthen this setting in proportion.
A710 (Pr.165): Set the appropriate restart stall prevention operation
Is the
NO
Turn ON the CS terminal at the power restoration.
YES
It can remain ON from the normal state.
NO
Is the STF
ON?
Turn ON the STF (STR) terminal
YES
at the power restoration.
0
Which
Speed search method
A700 (Pr.162)
Is a
1
dedicated motor
Reduced voltage start
used?
Is the
How much
or more?
is the motor and
inverter capacity?
NO
Is the load
GD2 large?
NO
Does the
output MC turn OFF at
instantaneous power
failure?
Does an
alarm occur at
a restart?
Can the
selected for
Is the
the model?
Pr. setting
correct?
NO
The inverter is faulty.
Replace it with a substitute
or return it to the factory to repair.
level and others.
YES
NO
Upgrade of 2 ranks or more
Can the
Same capacity,
combination of capacities
1 rank up be changed?
YES
Change the capacity
combination of the inverter
and motor to within 1 rank.
YES
Turn ON the output side MC faster
NO
than the CS signal at the power
restoration.
NO
Lengthen the restart coasting time
YES
A702 (Pr.57) and restart cushion
time A703 (Pr.58).
NO
YES
Set Pr. again after all clear.
5.1 Troubleshooting
NO
Select the reduced voltage start.
A700 (Pr.162) = 1
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