YASKAWA SGD7S series Product Manual page 137

4.5 I/O Signal Connections
4.5.4 I/O Circuits
Sequence Output Circuits
Important
 Open-Collector Output Circuits
This section describes CN1 connector terminals 37 to 39 (Alarm Code Output).
The Alarm Code (ALO1, ALO2, and ALO3) signals are output from open-collector transistor
output circuits. Connect an open-collector output circuit to a photocoupler, relay, or line-
receiver circuit.
Note: The maximum allowable voltage and maximum allowable current for open-collector output circuits are as fol-
lows:
 Photocoupler Output Circuits
Photocoupler output circuits are used for the ALM (Servo Alarm), /S-RDY (Servo Ready), and
other sequence output signals. Connect a photocoupler output circuit to a relay or line-receiver
circuit.
Note: The maximum allowable voltage and current range for photocoupler output circuits are as follows:
4-46
Incorrect wiring or incorrect voltage application to the output circuits may cause short-circuit fail-
ures.
If a short-circuit failure occurs as a result of any of these causes, the holding brake will not work.
This could damage the machine or cause an accident that may result in death or injury.
Example for Photocoupler Circuit
5 VDC to 0 VDC
ERVOPACK
0 V
0 V
Example for Line Receiver Circuit
ERVOPACK
5 VDC to 0 VDC
0 V
• Maximum allowable voltage: 30 VDC
• Maximum allowable current: 20 mA DC
Example for Relay Circuit
ERVOPACK 5 VDC to 0 VDC
0 V
• Maximum allowable voltage: 30 VDC
• Current range: 5 mA to 50 mA DC
Photocoupler
Relay
Example for Relay Circuit
ERVOPACK
5 VDC to 0 VDC
0 V
Example for Line-Receiver Circuit
ERVOPACK
5 VDC to 0 VDC
Relay