YASKAWA SGD7S Product Manual page 124

4.5 I/O Signal Connections
4.5.4 I/O Circuits
Sequence Output Circuits
Important
 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.
SERVOPACK
Note: The maximum allowable voltage and current range for photocoupler output circuits are as follows:
 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.
4-40
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 Relay Circuit
5 VDC to 30 VDC
0 V
• Maximum allowable voltage: 30 VDC
• Current range: 5 mA to 50 mA DC
Example for Line-Receiver Circuit
SERVOPACK
Output line driver: Applicable line receiver:
SN75ALS174 or SN75ALS175 or MC3486
the equivalent manufactured by Texas Instruments
or the equivalent
SERVOPACK
Relay
Host controller
220 Ω to
470 Ω
Example for Line-Receiver Circuit
5 VDC to 30 VDC