Fuji Electric FVR-C11S-7EN Series - Protective Function; 6-1 List of protective functions

6 Protective Function 6-1
FVR-C11S-EN
6
6 Protective Function
6-1 List of protec-
tive functions
When the protective function is activated, inverter output is instantl
y
cut
off (while the motor coasts until it is stopped), and an alarm is issued,
and the details of the alarm are displa
y
ed on the ke
y
pad panel.
Alarm Name
Ke
y
pad
panel
displa
y
Contents of operation
Overcurrent
OC1
Durin
g
acceleration
If the inverter output current momentaril
y
ex-
ceeds the overcurrent detection level because of
an overcurrent in the motor or the short-circuit in
the output circuit, the output is shut down, an
alarm is issued, and the inverter is tripped.
OC2
Durin
g
deceleration
OC3
While runnin
g
at
constant speed
Overvolta
g
e
OU1
Durin
g
acceleration
If the DC volta
g
e of the main circuit exceeds the
overvolta
g
e detection level because of an in-
crease in the re
g
eneratin
g
current from the mo-
tor, etc., output is shut down, an alarm is issued,
and the inverter is tripped. However, protection
a
g
ainst inadvertent overvolta
g
e loadin
g
(e.
g
.
hi
g
h-volta
g
e line) mi
g
ht not be provided.
OU2
Durin
g
deceleration
OU3
While runnin
g
at
constant speed
Undervolta
g
eLU
If the DC volta
g
e of the main circuit falls below the undervolta
g
e de-
tection level because of a lowered power suppl
y
, output is shut down
to protect the inverter. If the restart function after momentar
y
power
failure is not activated, an alarm is issued and the inverter is tripped.
If the restart function is activated, the inverter restarts automaticall
y
with no alarm.
For further details of the protective function, refer to the descriptions
of Function F14.
Overheatin
g
of
heat sink
OH1
If the temperature of the heat sink used for coolin
g
the rectifier diodes
and IGBTs rises because of coolin
g
fan failure, etc., protective func-
tion is activated to stop operation, an alarm is issued, and the inverter
is tripped.