YASKAWA SGDV series User Manual page 303

9 Troubleshooting
9.1.2 Troubleshooting of Alarms
Alarm Number:
Alarm Name
(Alarm Description)
A.100:
Overcurrent or Heat
Sink Overheated
(An overcurrent flowed
through the IGBT or
heat sink of SERVO-
PACK overheated.)
9-8
Cause
Incorrect wiring or contact fault
of main circuit cables.
Short-circuit or ground fault of
main circuit cables.
Short-circuit or ground fault
inside the servomotor.
Short-circuit or ground fault
inside the SERVOPACK.
The dynamic brake (DB: Emer-
gency stop executed from the
SERVOPACK) was frequently
activated, or the DB overload
alarm occurred.
A heavy load was applied while
the servomotor was stopped or
running at a low speed.
Malfunction caused by noise
interference.
The setting of Pn515.2 (Dynamic
Brake Answer Signal 1 (/
DBANS1) Input Signal Mapping)
does not agree with the contacts
of the dynamic brake contactor
that is connected.
Current flowed to the dynamic
brake resistor when power to the
servomotor was ON due to weld-
ing or other failure of the
dynamic brake contacts.
A fault occurred in the SERVO-
PACK.
Investigative Actions
Check the wiring. Refer to 3.1
Main Circuit Wiring.
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.
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.
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.
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.
Check to see if the operating condi-
tions are outside servo drive specifi-
cations.
Improve the wiring or installation
environment, such as by reducing
noise, and check to see if the alarm
recurs.
Check the setting of Pn515.2 and
the contacts of the dynamic brake
contactor.
Check the contactor to see if it is
welded.
−
(cont'd)
Corrective Actions
Correct the wiring.
The cable may be short-circuited.
Replace the cable.
The servomotor may be faulty.
Replace the servomotor.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
Change the SERVOPACK model,
operating conditions, or the mecha-
nism so that the DB does not need
to be used so frequently.
Reduce the load applied to the ser-
vomotor or increase the operating
speed.
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.
Set Pn515.2 to agree with the con-
tacts of the dynamic brake contac-
tor.
The dynamic brake contactor may
have failed. Replace the dynamic
brake contactor.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK or con-
verter may be faulty. Replace the
SERVOPACK or converter.