YASKAWA SGD7S Product Manual page 131

4.5 I/O Signal Connections
4.5.4 I/O Circuits
Important
4-44
• Precaution When Host Controller Uses Open-Collector Output with User-Supplied Power Sup-
ply
The SERVOPACK may fail depending on the relationship between the pull-up voltage (Vcc) and
the pull-up resistance (R1). Before you wire the circuits, confirm that the specifications of the
host controller satisfy the values shown in the following table.
Pull-Up Voltage (Vcc)
24 V
12 V max.
5 V max.
Circuit Example for Open-Collector Outputs
Host controller
Vcc
R1
i
Pull-up
Tr1
Pull-Up Resistance (R1)
1.8 kΩ to 2.7 kΩ
820 Ω to 1.5 kΩ
180 Ω to 470 Ω
SERVOPACK
Ω
Ω
150
4.7 k
V F
VF = 1.5 V to 1.8 V