YASKAWA E-V-MD Series, User Manual

Page: 268 / 321

10 Maintenance, Inspections, and Troubleshooting
10.2.2 Troubleshooting of Alarms
10-8
A.100:
Overcurrent or Heat
Sink Overheated
(An overcurrent flowed
through the IGBT or
heat sink of
SERVOPACK
overheated.)
The servomotor/encoder relay
cable is either incorrectly wired
or has a contact fault.
Check the wiring. Refer to 5.1 Wir-
ing the Main Circuit and Control
Power Supplies. Correct the wiring.
The servomotor/encoder relay
cable is either internally shorted
or has a ground fault.
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 .
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
5.1 Wiring the
Main Circuit and Control Power
Supplies
.
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
5.1 Wiring the
Main Circuit and Control Power
Supplies
.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
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 SERVOPACK main circuit wire
size.
A SERVOPACK fault occurred.
−
Restart the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
A.400:
Overvoltage
(Detected in the
SERVOPACK main
circuit power supply
section.)
The DC power supply voltage
exceeded 60 V.
Measure the power supply voltage.
Set DC power supply voltage within
the specified range.
The power supply is unstable, or
was influenced by a lightning
surge. Measure the power supply voltage.
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.
Voltage for DC power supply was
too high during acceleration or
deceleration. Check the power supply voltage and
the speed and torque during opera-
tion.
Set DC power supply voltage within
the specified range.
The moment of inertia ratio
exceeded the allowable value. Confirm that the moment of inertia
ratio is within the allowable range. Increase the deceleration time, or
reduce the load.
A.510:
Overspeed
(The servomotor
speed exceeds the
maximum.)
The order of phases U, V, and W
in the servomotor wiring is incor-
rect.
Check the motor wiring.
Confirm that the servomotor is cor-
rectly wired.
A reference value exceeding the
overspeed detection level was
input.
Check the input value.
Reduce the reference value or adjust
the gain.
The motor speed exceeded the
maximum.
Check the motor speed waveform.
Reduce the speed reference input
gain, adjust the servo gain, or recon-
sider the operating conditions.
(cont’d)
Alarm Number:
Alarm Name
(Alarm Description)
Cause Investigative Actions Corrective Actions