24.
TROUBLESHOOTING
~~
24.3
Protection
Functions
The
following protection functions are provided to protect
the
inverter. If any of the protection
functions is activated, the inverter output
is
shut
off,
the error
massage
is
displayed, and at the
same
time the error signal
is
output. In this case,
the
drive output
is
halted
and the motor is free
to
rotate.
To
restart operation,
it
is necessary
to
reset
the
inverter
Function
Name
Overcurrent shut-M
Regenerative
overvoltage shut-off
Overload
shut-ofi
thermal
(electronic
rew
('1)
Motor
-
Inverter
-
External thermal
relay input ('2)
Brake transistor
error detection ('3)
Parameter error
Parameter unit
disconnection
Retry count over
heription
Dlsplay
(Paramhw
Unit\
If
the inverter output current
Bxceeds
200%
of
the rated current during
aEceleration/deceleration
or
constant speed operation, the protection circuit
is
actuated and Inverter output is
shut
oft
If the DC voltage in
the
main circuit
During
exceeds the
specfied
value due
to
regenerative anergy during braking, the
Ouring
protection circuit is activated and inverter
speed operation
"ouz
(OV2)
output is shut off.
During
deceleration
If
overheating of the motor
due
to ovebad or lowered
cooling performance during low
speed
operation is sensed by
the ekronic thermal relay buiR in the inverter, the inverter
output is shut off.
To
operate a muHiipole motor or more
than one motor, provide a thermal relay on the output side
of
the inverter for each motor.
If the current exceeds
150%
of the rated output current, but
lower than 200% (overcurrent shut-off level), the electronic
thermal relay is activated due to inversa time characteristics
C.THT
(THT)
to shut off the inverter output. thereby protecting the output
transistors.
If
the motor overheat protection thermal relay, installed
extemaliy, or the thermal relay built in the motor is activated
(contact break), the Inverter output is shut
off
In this case,
E.OHf
(OHT)
the inverter
does
not restart even
if
the relay contacl closes
automatically unless the inverter
is
reset.
If an error
of
the brake transistor occurs due to excesslvely
large regeneration energy (optional brake resistor connwted),
E,
bE
(BE)
the function detects the error and shuts of the inverter output.
The error signal is output and the inverter output is shut
off.
If an EEPROM error
is
detected.
If
communications between the parameter unit and the
Inverter is suspended due to disconnection
01
the parameter
unit from the inverter while the senlng for Pr.75 is 2,
3,
16
or
17, the Inverter output is shut off.
If
the operation cannot be Co-restarted within the preset
number
of
retries, the inverter output is shut off.
E.Cu
(OV1)
E.0~3
(OV3)
Em
(THM)
E.
Pf
(PE)
E.PUE
(PUE)
ErEr
(RET)
-
107
-
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