Yaskawa Sigma II Indexer - Manual (Page 72)

Sigma II Indexer User’s Manual Sequence I/O Signals
5-17
These signals output alarm codes to indicate the type of alarm detected by the servo
amplifier. Use these signals to display alarm codes at the host controller. See 8.2.1&
8.3.1 Alarm Status Display Table for more on the relationship between alarm display
and alarm code output.
Form an external circuit so the servo amplifier turns OFF when an alarm occurs.
Alarms are reset automatically when the control power supply is turned OFF.
Alarms can also be reset using a digital operator via CN7, by serial command ARES
via CN6, or by the built-in panel display (SGDH alarms only).
Note: 1. Encoder alarms cannot always be reset by digital operator or by serial command. See 8.2.1 &
8.3.1 Alarm Status Display Table for list of resettable alarms. In that case, turn the control power
supply OFF to reset the alarm.
2. When an alarm occurs, always eliminate the cause before resetting the alarm.
5.3.3 Using the Holding Brake
The holding brake is used when a servodrive controls a vertical axis. In other words,
a servomotor with brake prevents the movable part from shifting due to the force of
gravity when system power goes OFF.
Figure 5.7 Holding Brake
Note: The brake built into the servomotor SGM H with brakes is a de–energization brake, which is used
only to hold and cannot be used for braking. Use the holding brake only to hold a stopped motor.
Brake torque is at least 120% of the rated motor torque.
Servomotor
Prevents the movable part from
shifting due to gravity when
system power goes OFF.
Holding brake