Sigma II User’s Manual
Chapter 5: Parameter Settings and Functions
5-69
5.5 Forming a Protective Sequence
This section describes the procedure for using I/O signals from the servo amplifier to
form a protective safety sequence.
5.5.1
Using Servo Alarm and Alarm Code Outputs
The basic procedure for connecting alarm output signals is described below.
A suitable external I/O power supply must be provided by the user separately
because there is no internal 24V power supply in the servo amplifier.
The use of the photocoupler output signals is described below.
These alarms are output when a servo amplifier alarm is detected.
Form an external circuit so this alarm output (ALM) turns the servo amplifier OFF.
Alarm codes ALO1, ALO2 and ALO3 are output to indicate each alarm type.
Output
ð
ALM+ CN1-31
Servo Alarm Output
Speed/Torque Control,
Position Control
Output
ð
ALM- CN1-32
Signal Ground for Servo Alarm Output
Speed/Torque Control,
Position Control
State
Status
Result
ON
Circuit between CN1-31 and 32 is closed, and
CN1-31 is at low level.
Normal state.
OFF
Circuit between CN1-31 and 32 is open, and
CN1-31 is at high level.
Alarm state.
Servo amplifier
CN1-3
1
CN1-32
ALM+
ALM-
I/O power supply
+24V
0V
Photocoupler
CN1-37
CN1-38
CN1-39
ALO1
ALO2
ALO3
SG
CN1-1
0V
0 V
Host controller
50mA max.
20mA max.
Open-collector output
levels per output node:
• Maximum operating
voltage: 30V
DC
• Maximum output cur-
rent: 20mA
DC
Photocoupler output levels
per output node:
• Maximum operating
voltage: 30V
DC
• Maximum output cur-
rent: 50mA
DC
Turns power OFF.
Alarm
detection
Servo amplifier
ALM output
