Fuji Electric FVR-E11S-7EN

7-2
(2) Overvoltage
YES
NO
NO
Overvoltage during
acceleration OU1
Overvoltage during
deceleration OU2
Overvoltage during
constant speed
operation OU3
Decrease the source
voltage to lower than the
upper limit in the
specifications.
Check if the source voltage is within the range specified in
the specifications.
YES
NO
YES YES
Check if operation is observed after sudden removal of the
load.
NO NO NO
Check if the DC link voltage of the main circuit during
activation of the overvoltage is beyond the protective level.
YES YES YES
Failure of the inverter or
malfunction due to
electric noise or other
cause is probable.
Contact Fuji Electric.
Check if operation
is possible after
sudden
acceleration.
Check if the deceleration
time can be made longer.
Check if the acceleration
time can be made longer.
Set a longer
deceleration
time.
Reduce the inertia
moment.
NO
Check if the inertia moment of the load can be made
smaller.
NO NO NO
NO NO
YES
Check if a braking unit or DC control function is used.
YES YES YES
Examination of the control method is necessary. Contact Fuji Electric.
NO
Examine
applicati
on of a
braking
unit or
DC
braking
function.
(3) Undervoltage
NO
YES
Undervoltage
LU
Reset and
restart
operation.
Check if power failure
(including momentary one)
has occurred.
YES
NO
Replace the
defective device
or repair the
connection error.
Check if there is failure of a
device or poor contact in
the power supply circuit.
YES
Failure of the inverter
control circuit or
malfunction due to
electric noise or other
cause is probable.
Contact Fuji Electric.
Check if there is a load
requiring a large starting
current in the same power
supply system.
NO
Check if
operation is
observed when
the circuit
breaker and
electromagnetic
contactor are
turned on.
Examine the power
supply system so that
the specification
values are satisfied.
Failure of the
inverter is
probable. Contact
Fuji Electric.
Check if the power supply
transformer capacity is
proper.
Check if the current
(across P and N)
and the voltage of
the main circuit are
above the detection
level specified in
Table 6-1-1.
YES
NO
YES
YES
NO
YES
Check if the
source voltage
is within the
range specified
in the
specifications.
YES
YES
NO