8 Troubleshooting
8.1.2 Troubleshooting of Alarms
8-8
A.050:
Combination Error
(The SERVOPACK and
servomotor capacities do
not correspond.)
The SERVOPACK and servomo-
tor capacities do not match each
other.
Check the capacities to see if they
satisfy the following condition:
Select the proper combination of
SERVOPACK and servomotor
capacities.
An encoder fault occurred.
Replace the servomotor and see if
the alarm occurs again.
Replace the servomotor (encoder).
A fault occurred in the SERVO-
PACK or converter.
−
The SERVOPACK or converter
may be faulty. Replace the SERVO-
PACK or converter.
A.051:
Unsupported Device
Alarm
An unsupported serial converter
unit, encoder, or external encoder
is connected to the multi-winding
drive unit.
Check the product specifications,
and select the correct model.
Select the correct combination of
units.
A.0b0:
Cancelled Servo ON
Command Alarm
After executing the utility func-
tion to turn ON the power to the
motor, the servo ON command
(SV_ON) was sent from the host
controller.
−
Turn the control power supply OFF
and ON again.
Or, execute a software reset.
A.100:
Overcurrent or Heat
Sink Overheated
(An overcurrent flowed
through the IGBT or
heat sink of SERVO-
PACK overheated.)
Incorrect wiring or contact fault
of main circuit cables.
Check the wiring. Refer to
3.1
Main Circuit Wiring.
Correct the wiring.
Short-circuit or ground fault of
main circuit cables.
Check for short-circuits across the
servomotor terminal phases U, V,
and W, or between the grounding
and servomotor terminal phases U,
V, or W. Refer to
3.1 Main Circuit
Wiring
.
The cable may be short-circuited.
Replace the cable.
Short-circuit or ground fault
inside the servomotor.
Check for short-circuits across the
servomotor terminal phases U, V,
and W, or between the grounding
and servomotor terminal phases U,
V, or W. Refer to
3.1 Main Circuit
Wiring
.
The servomotor may be faulty.
Replace the servomotor.
Short-circuit or ground fault
inside the SERVOPACK.
Check for short-circuits across the
servomotor connection terminals U,
V, and W on the SERVOPACK, or
between the grounding and terminal
U, V, or W. Refer to
3.1 Main Cir-
cuit Wiring
.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
The dynamic brake (DB: Emer-
gency stop executed from the
SERVOPACK) was frequently
activated, or the DB overload
alarm occurred.
Check the power consumed by DB
resistance (Un00B) to see how
many times the DB has been used.
Or, check the alarm history display
Fn000 to see if the DB overload
alarm A.730 or A.731 was reported.
Change the SERVOPACK model,
operating conditions, or the mecha-
nism so that the DB does not need
to be used so frequently.
A heavy load was applied while
the servomotor was stopped or
running at a low speed.
Check to see if the operating condi-
tions are outside servo drive specifi-
cations.
Reduce the load applied to the ser-
vomotor or increase the operating
speed.
Malfunction caused by noise
interference.
Improve the wiring or installation
environment, such as by reducing
noise, and check to see if the alarm
recurs.
Take countermeasures for noise,
such as correct wiring of the FG.
Use an FG wire size equivalent to
the main circuit wire size of the
SERVOPACK and converter.
(cont’d)
Alarm Number:
Alarm Name
(Alarm Description)
Cause
Investigative Actions
Corrective Actions
≤
Servomotor capacity
SERVOPACK capacity
≤
4
1
4