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9 Troubleshooting
9.1.2 Troubleshooting of Alarms
9-8
A.100:
Overcurrent or Heat
Sin
k Overheated
(An overcurrent flowed
throu
gh 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
ma
in 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 ter
minal 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.
Incorrect wiring or contact fault
of the regenerative resistor.
Check the wiring. Refer to 3.6 Con-
necting Regenerativ
e Resistors.
Correct the wiring.
The dynamic brake (DB: Emer-
gency stop executed from the
SER
VOPACK) was frequently
activated, or the DB overload
alarm occurred.
Check the power consumed by DB
resistance (Un00
B) 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.
The generated regenerativ
e resis-
tor value exceeded the SERVO-
PACK regenerative energy
processing capacity.
Check the regenerative load ratio
(Un0
0A) to see how many times the
regenerative resistor has been used.
Check the operating condition
including overload, and reconsider
the regenerative resistor value.
The SERVOPACK regenerative
re
sistance is too small.
Check the regenerative load ratio
(Un0
0A) to see how many times the
regenerative resistor has been used.
Change the regenerative resistanc
e
value to a value larger than the
SERVOPACK minimum allowable
resistance value.
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
spe
ed.
Malfunction caused by noise
interference.
Improve the wiring or installation
envir
onment, 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 SERVOPACK main circuit wire
size.
A SERVOPACK fault occurred.
Turn the power supply OFF and
the
n ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
(cont’d)
Alarm Number:
Alarm Name
(Alarm Description)
Cause Investigative Actions Corrective Actions
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