Omron C200H-MC221 Operation Manual page 19

Wiring Precautions
Noise may be generated on the power supply line if the same power supply line
is used for an electric welder or electrical discharge unit. Provide an insulating
transformer and a line filter in the power supply section to remove such noise.
It is recommended that twisted-pair cables be used for power supply lines. Use
adequate grounds (i.e., to 100 W or less) with a wire cross section of 1.25 mm
greater.
Use twisted-pair shielded cables for the control voltage output signals and the
feedback input signals.
For the control voltage output signals, wire a maximum of two meters between
the MC Unit and the servodriver.
Wire the distance between the MC Unit and the feedback pulse generator (i.e.,
encoder or the servodriver) as follows:
· When the feedback pulse is output from a line driver, wire a maximum length of
20 meters.
Note The input terminals that operate the 24-V system are isolated with photocoup-
lers to reduce external noise effects on the control system. Avoid connections
between the analog control voltage ground (AG) and the 24-V system ground
(DC GND).
Solenoid
Surge absorber
MC Unit
Voltage output
2 m max.
Line Driver Output
MC Unit
Feedback input
20 m max.
Section 1-5
Servodriver
Servodriver or
encoder
2
or
5