YASKAWA SGD7S Product Manual page 133

Sequence Output Circuits
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.
Important
This could damage the machine or cause an accident that may result in death or injury.
 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.
Example for Relay Circuit
SERVOPACK
Note: The maximum allowable voltage and current range for photocoupler output circuits are as follows:
• Maximum allowable voltage: 30 VDC
• Current range: 5 mA to 50 mA DC
 Line-Driver Output Circuits
This section describes CN1 connector terminals 17-18 (Phase-A Signal), 19-20 (Phase-B Sig-
nal), and 21-22 (Phase-C Signal).
The serial data from the encoder is converted to two-phase (phases A and B) pulses. The
resulting output signals (PAO, /PAO and PBO, /PBO), origin pulse signal (PCO and /PCO), and
the absolute encoder position output signals (PSO and /PSO) are output with line-driver output
circuits. Connect the line-driver output circuits to line-receiver circuits at the host controller.
Example for Line-Receiver Circuit
SERVOPACK
Output line driver:
SN75ALS174 or
the equivalent
5 VDC to 30 VDC
Relay
0 V
Host controller
Applicable line receiver:
SN75ALS175 or MC3486
manufactured by Texas Instruments
or the equivalent
220 Ω to
470 Ω
4.5 I/O Signal Connections
Example for Line-Receiver Circuit
SERVOPACK
5 VDC to 30 VDC
4.5.4 I/O Circuits
4
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