YASKAWA E-V-MD Series User Manual page 268

10 Maintenance, Inspections, and Troubleshooting
10.2.2 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
SERVOPACK
overheated.)
A.400:
Overvoltage
(Detected in the
SERVOPACK main
circuit power supply
section.)
A.510:
Overspeed
(The servomotor
speed exceeds the
maximum.)
10-8
Cause
The servomotor/encoder relay
cable is either incorrectly wired
or has a contact fault.
The servomotor/encoder relay
cable is either internally shorted
or has a ground fault.
Short-circuit or ground fault
inside the servomotor.
Short-circuit or ground fault
inside the SERVOPACK.
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.
The DC power supply voltage
exceeded 60 V.
The power supply is unstable, or
was influenced by a lightning
surge.
Voltage for DC power supply was
too high during acceleration or
deceleration.
The moment of inertia ratio
exceeded the allowable value.
The order of phases U, V, and W
in the servomotor wiring is incor-
rect.
A reference value exceeding the
overspeed detection level was
input.
The motor speed exceeded the
maximum.
Investigative Actions
Check the wiring. Refer to 5.1 Wir-
ing the Main Circuit and Control
Power Supplies.
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 5.1 Wiring the
Main Circuit and Control Power
Supplies.
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 5.1 Wiring the
Main Circuit and Control Power
Supplies.
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 5.1 Wiring the
Main Circuit and Control Power
Supplies.
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.
−
Measure the power supply voltage.
Measure the power supply voltage.
Check the power supply voltage and
the speed and torque during opera-
tion.
Confirm that the moment of inertia
ratio is within the allowable range.
Check the motor wiring.
Check the input value.
Check the motor speed waveform.
(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.
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.
Restart the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
Set DC power supply voltage within
the specified range.
Improve the power supply condi-
tions by installing a surge absorber,
etc. Then, restart the SERVOPACK.
If the alarm still occurs, the SER-
VOPACK may be faulty. Replace
the SERVOPACK.
Set DC power supply voltage within
the specified range.
Increase the deceleration time, or
reduce the load.
Confirm that the servomotor is cor-
rectly wired.
Reduce the reference value or adjust
the gain.
Reduce the speed reference input
gain, adjust the servo gain, or recon-
sider the operating conditions.