Omron CS1W-MC221 - 02-2008 Operation Manual page 156

Wiring
For inductive loads such as relays or solenoid valves, connect surge absorb-
ers.
DC Relay
Note Connect a surge-absorbing diode or surge absorber close to the relay. Use a
surge-absorbing diode with a voltage tolerance at least five times greater than
the circuit voltage.
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 insu-
lating 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
2
2 mm or greater.
Use twisted-pair shielded cables for control voltage output signals, MPG sig-
nals, sync encoder signals, and feedback input signals.
For the control voltage output signals, wire a maximum of 2 m between the
MC Unit and the servo driver.
Wire the distance between the MC Unit and the feedback pulse generator
(i.e., encoder or the servo driver) with a maximum length of 2 m.
Note The input terminals that operate the 24-V system are isolated with photocou-
plers to reduce external noise effects on the control system. Avoid connec-
Surge-absorbing
diode
Solenoid
Surge absorber
or less) with a wire cross section of
MC Unit
Voltage output
2 m max.
Line Driver Output
MC Unit
Feedback input
(Line driver output)
2 m max.
Section 2-3
AC Relay
Surge absorber
Servo Driver
Servo driver
or encoder
129