YASKAWA SGMJV User Manual page 307

9 Troubleshooting
9.1.2 Troubleshooting of Alarms
Alarm Number:
Alarm Name
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.
Incorrect wiring or contact fault
of the regenerative resistor.
The dynamic brake (DB: Emer-
gency stop executed from the
SERVOPACK) was frequently
activated, or the DB overload
alarm occurred.
The generated regenerative resis-
tor value exceeded the SERVO-
PACK regenerative energy
processing capacity.
The SERVOPACK regenerative
resistance is too small.
A heavy load was applied while
the servomotor was stopped or
running at a low speed.
Malfunction caused by noise
interference.
A SERVOPACK fault occurred.
Investigative Actions
Check the wiring. Refer to 3.1
Main Circuit Wiring for details.
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 for details.
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 for details.
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 for details.
Check the wiring. Refer to 3.7 Con-
necting Regenerative Resistors for
details.
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 the regenerative load ratio
(Un00A) to see how many times the
regenerative resistor has been used.
Check the regenerative load ratio
(Un00A) to see how many times the
regenerative resistor has been used.
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.
−
(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.
Correct the wiring.
Change the SERVOPACK model,
operating conditions, or the mecha-
nism so that the DB does not need
to be used so frequently.
Check the operating condition
including overload, and reconsider
the regenerative resistor value.
Change the regenerative resistance
value to a value larger than the
SERVOPACK minimum allowable
resistance value.
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 SERVOPACK main circuit wire
size.
Turn the power supply to the SER-
VOPACK OFF and ON again. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.