Yaskawa Sigma II Series DC Power Input SGMAJ - Manual (Page 249)

8 Operation
8.11.1 Servo Alarm Output (ALM) and Alarm Code Output (ALO1, ALO2, ALO3)
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8.11 Other Output Signals
The following output signals, which have no direct connection with the control modes, are used for machine pro-
tection.
8.11.1 Servo Alarm Output (ALM) and Alarm Code Output (ALO1, ALO2, ALO3)
(1) Servo Alarm Output (ALM)
This signal is output when an error is detected in the SERVOPACK.
(2) Alarm Reset
1. Some encoder-related alarms cannot be reset with the /ALM-RST signal input. To reset these alarms,
turn OFF the control power supply.
2. When an alarm occurs, always eliminate the cause before resetting the alarm. The methods for trouble-
shooting alarms are described in 10.1.3 Troubleshooting of Alarm and Warning.
(3) Alarm Code Output
Type Signal
Name
Connector
Pin Number
Setting Meaning
Output ALM CN1-34, 35
(Factory setting) ON (low level) Normal SERVOPACK condition
OFF (high level) SERVOPACK alarm condition
„ IMPORTANT
Always form an external circuit so this alarm output turns OFF the main circuit power supply to the SERVOPACK.
Type Signal
Name
Connector
Pin Number
Name
Input /ALM-
RST CN1-18 Alarm Reset
When a servo alarm (ALM) has occurred and the cause of the alarm has been eliminated, the alarm can be reset by turning
this signal (/ALM-RST) from OFF (high level) to ON (low level).
This signal can be allocated to other pin numbers with Pn50B.
For details on the procedure, refer to 7.3.2 Input Circuit Signal Allocation.
The /ALM-RST signal cannot be constantly enabled by the allocation of an external input signal. Reset the alarm by chang-
ing the signal from high level to low level. The alarm can also be reset from the panel operator or digital operator. Refer to
7.1.2 Key Names and Functions for details.
IMPORTANT
Type Signal
Name
Connector
Pin Number
Meaning
Output ALO1 CN1-30 Alarm code output
Output ALO2 CN1-31 Alarm code output
Output ALO3 CN1-32 Alarm code output
Output SG CN1-33 Signal ground for alarm code output
These open-collector signals output alarm codes. The ON/OFF combination of these output signals indicates the type of
alarm detected by the servomotor.
Use these signals to display alarm codes at the host controller. Refer to 10.1.1 Alarm Display Table for details on alarm
code output.