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13. SERVO AMPLIFIERS WITH A LARGE CAPACITY (30k TO 55kW)
Display Name Definition Cause Action
1. Wrong connection of the magnetic
contactor.
Review the wiring.
2. Parameters specifying whether to
use/not use the magnetic contactor
do not match the configuration.
Set parameter No.PA02 correctly.
3. Magnetic contactor failed. Change the magnetic contactor.
Magnetic contactor drive
circuit error
(When the magnetic
contactor is turned on: the
main circuit power supply is
not turned on within two
seconds after the servo-on
of the drive unit.
When the magnetic
contactor is opened: the
main circuit power supply is
turned on although the
magnetic contactor is
opened.)
4. Magnetic contactor drive circuit
faulty.
Checking method
Check the output of magnetic
contactor control connector (CNP1) .
Power supply voltage is applied to
this connector. Take care to avoid an
electric shock at connecting.
Change the converter unit.
A.38 MC drive circuit
error
5. Mismatch of an external sequence. Review the power-on sequence.
(Refer to section 3.3.2.)
1. Any of L
1
, L
2
and L
3
is disconnected.
Or, open.
Review the wiring. A.39 Open phase Power supply error
2. Failure of the part in the converter
unit.
Change the converter unit.
1. Power-on/off was repeated with high
frequency.
Review operation pattern.
2. Inrush current suppressor resistance
overheated.
A.3A Inrush current
suppressor
circuit error
Inrush current suppressor
circuit error
3. Inrush current suppressor circuit
faulty.
Change the converter unit.
1. The power supply was turned on and
off continuously by overloaded
status.
Review operation pattern.
2. Ambient temperature of converter
unit is over 55
.
Review environment so that
ambient temperature is 0 to 55 .
A.45 Main circuit
device
overheat
Main circuit device
overheat.
3. Converter unit faulty. Change the converter unit.
1. Cooling fan life expiration. (Refer to
section 2.6.)
Change the cooling fan of the
converter unit.
2. Foreign matter caught in the cooling
fan stopped rotation.
Remove the foreign matter.
A.47 Cooling fan
alarm
The cooling fan of the
converter unit stopped, or its
speed decreased to or
below the alarm level.
3. The power supply of the cooling fan
failed.
Change the converter unit.
A.50 Overload 1 Load exceeded overload
protection characteristic of
converter unit.
Converter unit is used in excess of its
continuous output current.
1. Reduce load.
2. Review operation pattern.
A.51 Overload 2 Load exceeded overload
protection characteristic of
converter unit.
Converter unit is used in excess of its
output current for a short time.
Review operation pattern of a
drive unit.
(Note)
888
Watchdog CPU/parts fault Failure of the part in the converter unit.
Checking method
Alarm (888) occurs if power is
switched on after connectors
disconnected.
Change the converter unit.
Note. At power-on, "888" appears instantaneously, but it is not an error.