EMSD5 AC Servo Manual
Chapter 4 Wiring and Introduction
33
As shown in the picture below, when using RS485 communications, the ground signal of the
upper device is connected with the earth:
4.7 Anti-jamming Countermeasures of Power Wiring
To suppress interference, please take the following measures:
⚫
Instruction input cable length should be less than 3 meters,and encoder cable should be less
than 20 meters.
⚫
Recommend grounding cable over 2.0 mm²
⚫
Please install a noise filter on the input side of the power cable to prevent radio frequency
interference.
⚫
To avoid electromagnetic interfering, the followingmethods can be used:
1)
Install the upper device and a noise filter near the servo drive.
2)
Install a surge suppressors on coils of relays, solenoids, electromagnetic contacts.
3)
Separate high and low voltage cables away minimum at 30 cm.
4)
Do not share a power supply with welding devices, discharge processing devices, etc.
When there is a high frequency generator nearby, please install a noise filter on the
input side of the power cable.
4.7.1 Wiring Examples Of Anti-Jamming And Ground Handling
1. Examples of anti-jamming wiring
◆
PLC is built in RS485 communication terminal resistor.
◆
It is suggested that the shield layer should be ground at one end.
◆
Never connect the GND terminal of the upper device with the servo drive E0V
terminal, otherwise the machine will be damaged.
