User manual of EL8-EC***F AC Servo
55
2.17 Measures against electromagnetic interference
To reduce interference, please take the following measures:
I/O signal cable > 3m; Encoder cable > 20m
Use cable with larger diameter for grounding
①
Grounding resistance > 100Ω
②
When there are multiple drivers connected in parallel, PE terminal of the main
power supply and ground terminal of servo drives must be connected to copper
ground bar in the electrical cabinet and the copper ground bar needs to be
connected to the metal frame of the cabinet.
Please install a line filter on main power supply cable to prevent interference from
radio frequency.
In order to prevent malfunctions caused by electromagnetic interference, please take
following measures:
○
1 Install master device and line filter close to the servo drive
○
2 Install surge suppressor for relay and contactor
○
3 Please separate signal/encoder cable from power cable with a space of at least
30cm
○
4 Install a line filter for the main power supply if a device with high frequency
generation such as a welding machine exists nearby
2.17.1 Grounding connection and other anti-interference wiring
connections
CN2
U
PE
W
V
Contactor
L1
L3
L2
Line
Filter
Servo Drive
Encoder
Grounded
Ground
bar
3.5mm
2
or above
2.0mm
2
or
above
3.5mm
2
or above
Servo motor frame should be grounded. Please connect the PE terminal of servo
motor and servo drive and ground them together to reduce interference.
Ground both ends of the foil shield of encoder cable.
