
3 Wiring and Connections
47 SD780 Series Servo Technical Manual
3.10.3 Sequence Control Input Circuit
The following describes the 38 to 46 terminals of the CN1 port. Connect via a relay or open
collector transistor circuit. When using a relay connection, select the relay for the minute current. If
you do not use a minute current relay, it will cause poor contact.
Note:
The external power supply (DC24V) must have a capacity of 50 mA or more.
The input loop of the servo unit uses a bidirectional optocoupler. Please select the sink circuit
connection or the source circuit connection according to the specifications of the machine.
3.10.4 Sequence Output Loop
Servo unit signal output circuit is the following three kinds:
1. Open collector output circuit
The output signal (SEN, OCZ) is an open collector transistor output circuit. Please receive through
optocoupler circuit, relay circuit or linear receiver circuit.
OCZ
GND
Twisted wire
Servo drive
Controller
VCC
SEN
OCZ
GND
VCC
SEN
Optocoupler loop example
Relay circuit example
Controller
Servo drive
Twisted wire
OCZ
GND
Twisted wire
Servo drive
Controller
VCC
SEN
Linear receiver loop example
2. Optocoupler output circuit
The brake linkage (/BK), servo alarm (ALM), servo ready (/S-RDY) and other sequence output
signals belong to the optocoupler output circuit. Connect via relay or line receiver circuit.
E.g., /S
-
ON
DC24V
SERVOPACK
47 +24VIN
E.g., /S
-
ON
DC24V
SERVOPACK
47 +24VIN
4.7k
Ω
4.7k
Ω
Examples for Relay Circuit
Examples for Open
-
Collector Circuits