I/O Circuits - YASKAWA SGD7S Product Manual

4.5.4

I/O Circuits

Reference Input Circuits
 Analog Input Circuits
This section describes CN1 connector terminals 5-6 (Speed Reference Input) and 9-10 (Torque
Reference Input).
The analog signals are used as either speed or torque reference signals. The input impedance
is as follows:
• Speed Reference Input: Approx. 14 kΩ
• Torque Reference Input: Approx. 14 kΩ
The maximum allowable voltage for input signals is ±12 V.
Analog Voltage Input Circuit
Host controller
D/A
 Position Reference Input Circuits
This section describes CN1 connector terminals 7-8 (Reference Pulse Input), 11-12 (Reference
Sign Input), and 15-14 (Clear Input).
The output circuits for the reference pulses and Position Deviation Clear signal from the host
controller can be either line-driver outputs or open-collector outputs. The following diagrams
show these by output type.
Host controller
Applicable Line Driver:
SN75ALS174 from Texas
Instruments or equivalent
2.8 V ≤ (High level − Low level) ≤ 3.7 V
If the above formula is not satisfied, the inputs to the
SERVOPACK will be unstable. Pulses may be missed from
the Reference Pulse Input, reference inversion may occur
for the Reference Sign Input, and the Clear signal may turn
OFF for the Clear signal input.
(Example for D/A)
SERVOPACK
V-REF or T-REF
Approx. 14 kΩ min.
SG
0 V
Line-Driver Output Circuit
SERVOPACK
Ω
Ω
150
4.7 k
4.5 I/O Signal Connections
Analog Voltage Input Circuit
(Wiring Example for Forward Operation)
1.8 kΩ (1/2 W min.)
25HP-10B or
12 V
the equivalent
2 kΩ (1/2 W min.)
Open-Collector Output Circuits
(12-V Power Supply in SERVOPACK)
Host controller
PL1, PL2, or PL3 terminal
150
Approx.
9 mA
ON:
1.5 V max.

4.5.4 I/O Circuits

SERVOPACK
V-REF or T-REF
Approx. 14 kΩ min.
SG
0 V
SERVOPACK
+12 V
Ω
Ω
4.7 k
0 V
4-43
4