YASKAWA SIGMA-7 Series User Manual

6.1 Alarm Displays
6.1.2 Troubleshooting Alarms
6-24
A.C20:
Phase Detection
Error
The linear encoder
signal level is too low.
Check the voltage of
the linear encoder sig-
nal.
Fine-tune the mounting of
the scale head. Or,
replace the linear
encoder.
–
The count-up direc-
tion of the linear
encoder does not
match the forward
direction of the Mov-
ing Coil in the motor.
Check the setting of
Pn080 = n.X
(Motor Phase Sequence
Selection). Check the
installation orientation
for the linear encoder
and Moving Coil.
Change the setting of
Pn080 = n.X.
Correctly reinstall the lin-
ear encoder or Moving
Coil.
*1
The polarity sensor
signal is being
affected by noise.
–
Correct the FG wiring.
Implement countermea-
sures against noise for the
polarity sensor wiring.
–
The setting of Pn282
(Linear Encoder Scale
Pitch) is not correct.
Check the setting of
Pn282 (Linear Encoder
Scale Pitch).
Check the specifications
of the linear encoder and
set a correct value.
*1
A.C21:
Polarity Sensor
Error
The polarity sensor is
protruding from the
Magnetic Way of the
motor.
Check the polarity sen-
sor.
Correctly reinstall the
Moving Coil or Magnetic
Way of the motor.
–
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.
–
A.C22:
Phase Informa-
tion Disagree-
ment
The SERVOPACK
phase information is
different from the lin-
ear encoder phase
information.
–
Perform polarity detec-
tion.
*1
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