YASKAWA SIGMA-7 Series User Manual

6.1 Alarm Displays
6.1.2 Troubleshooting Alarms
6
Maintenance
6-19
A.820:
Encoder Check-
sum Alarm
(Detected at the
encoder.)
A failure occurred in
the encoder.
–
 When Using an Abso-
lute Encoder
Set up the encoder again.
If the alarm still occurs,
the Servomotor may be
faulty. Replace the Servo-
motor.
 When Using a Single-
turn Absolute Encoder
or Incremental Encoder
• The Servomotor may be
faulty. Replace the Ser-
vomotor.
• The linear encoder may
be faulty. Replace the
linear encoder.
*1
A failure occurred in
the SERVOPACK.
–
The SERVOPACK may be
faulty. Replace the
SERVOPACK.
–
A.830:
Encoder Battery
Alarm
(The absolute
encoder battery
voltage was lower
than the speci-
fied level.)
The battery connec-
tion is faulty or a bat-
tery is not connected.
Check the battery con-
nection.
Correct the battery con-
nection.
*1
The battery voltage is
lower than the speci-
fied value (2.7 V).
Measure the battery
voltage.
Replace the battery.
*1
A failure occurred in
the SERVOPACK.
–
The SERVOPACK may be
faulty. Replace the
SERVOPACK.
–
A.840:
Encoder Data
Alarm
(Detected at the
encoder.)
The encoder malfunc-
tioned.
–
Turn the power supply to
the SERVOPACK OFF and
ON again. If the alarm still
occurs, the Servomotor or
linear encoder may be
faulty. Replace the Servo-
motor or linear encoder.
–
An error occurred in
reading data from the
linear encoder.
–
The linear encoder is not
mounted within an appro-
priate tolerance. Correct
the mounting of the linear
encoder.
–
Excessive speed
occurred in the linear
encoder.
–
Control the motor speed
within the range specified
by the linear encoder
manufacturer and then
turn ON the control power
supply.
–
The encoder malfunc-
tioned due to noise.
–
Correct the wiring around
the encoder by separating
the Encoder Cable from
the Servomotor Main Cir-
cuit Cable or by ground-
ing the encoder.
–
The polarity sensor is
not wired correctly.
Check the wiring of the
polarity sensor.
Correct the wiring of the
polarity sensor.
–
The polarity sensor
failed.
–
Replace the polarity sen-
sor.
–
Continued on next page.
Continued from previous page.
Alarm Number:
Alarm Name
Possible Cause Confirmation Correction Reference

YASKAWA SIGMA-7 Series Specifications

General

Encoder Resolution	24-bit absolute encoder
Pollution Degree	2
Cooling Method	Natural cooling or forced air cooling
Control Method	Vector control
Communication Protocols	EtherCAT, MECHATROLINK-III
Input Voltage	AC 200 V, AC 400 V
Rated Output	Varies by model
Safety Function	STO (Safe Torque Off), SS1 (Safe Stop 1), SS2 (Safe Stop 2), SLS (Safely Limited Speed), SBC (Safe Brake Control)
Power Supply Voltage	AC 200 V, AC 400 V
Rated Output Current	Varies by model
Protection Functions	Overload, overvoltage, undervoltage, overheat, short circuit
Operating Temperature	0°C to 55°C
Storage Temperature	-20°C to 65°C
Vibration Resistance	5.9 m/s² at 10 Hz to 55 Hz
Ambient Humidity	5% to 95% RH (non-condensing)
Altitude	Up to 1000 m
Installation	Panel mounted