YASKAWA SIGMA-7 Series User Manual

6.1 Alarm Displays
6.1.2 Troubleshooting Alarms
6
Maintenance
6-17
A.740:
Inrush Current
Limiting Resistor
Overload
(The main circuit
power supply
was frequently
turned ON and
OFF.)
The allowable fre-
quency of the inrush
current limiting resis-
tor was exceeded
when the main circuit
power supply was
turned ON and OFF.
–
Reduce the frequency of
turning the main circuit
power supply ON and
OFF.
–
A failure occurred in
the SERVOPACK.
–
The SERVOPACK may be
faulty. Replace the
SERVOPACK.
–
A.7A1:
Internal Tempera-
ture Error 1
(Control Board
Temperature
Error)
The surrounding air
temperature is too
high.
Check the surrounding
air temperature using a
thermometer. Or, check
the operating status
with the SERVOPACK
installation environment
monitor.
Decrease the surround-
ing temperature by
improving the SERVO-
PACK installation condi-
tions.
*1
An overload alarm
was reset by turning
OFF the power sup-
ply too many times.
Check the alarm display
to see if there is an
overload alarm.
Change the method for
resetting the alarm.
–
There was an exces-
sive load or operation
was performed that
exceeded the regen-
erative processing
capacity.
Use the accumulated
load ratio to check the
load during operation,
and use the regenera-
tive load ratio to check
the regenerative pro-
cessing capacity.
Reconsider the load and
operating conditions.
–
The SERVOPACK
installation orientation
is not correct or there
is insufficient space
around the SERVO-
PACK.
Check the SERVOPACK
installation conditions.
Install the SERVOPACK
according to specifica-
tions.
*1
A failure occurred in
the SERVOPACK.
–
The SERVOPACK may be
faulty. Replace the
SERVOPACK.
–
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