APPLICATIONS OF Σ-SERIES PRODUCTS
3.7.2 Using Servo ON Input Signal
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5) When the servo alarm (ALM) is output, eliminate the cause of the alarm and set the fol-
lowing ALMRST
input signal at high level (+24 V) to reset the alarm state.
→ Input ALMRST 1CN-18
Alarm Reset For Speed/Torque
Control and
Position Control
This signal is used to reset the servo alarm state.
Normally, this signal terminal need not be wired.
This is because an external circuit is
normally formed so that servo power is turned OFF when servo alarm is output. Alarm
state is automatically reset when servo power is turned ON next time.
Alarm state can be reset using the Digital Operator.
When an alarm occurs, always eliminate the cause before resetting the alarm
state. 6.2.1 Troubleshooting Problems with Alarm Display describes how to trou-
bleshoot the system when an alarm arises.
3.7.2 Using Servo ON Input Signal
1) This section describes how to wire and use contact input signal “servo ON (S-ON).” Use
this signal to forcibly turn the servomotor OFF from the host controller.
I/O power
supply
Servopack
Host controller
Photocoupler
→ Input S-ON 1CN-14
Servo ON For Speed/Torque
Control and
Position Control
This signal is used to turn the motor ON or OFF.
ON: 1CN-14
is at low
level
Turns the motor ON. This is normal
operation state (called “servo ON
state”).
OFF:
1CN-14 is at
high level
Turns the motor OFF. This is inop-
erable state (called “servo OFF
state“).
If the servo is turned OFF during
motor operation, the motor is decel-
erated to a stop by applying dynam-
ic brake (standard setting).
This function can be selected by
setting bits 6 and 7 of memory
switch Cn-01.
3
Servo ON
Motor is ON
Motor is
operated
according to
input signals.
Servo OFF
Motor is OFF
Motor
cannot run.
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