IAI America PSEP - Manual (Page 33)

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1.6 Installation and Noise Elimination
(1) Noise Elimination Grounding (Frame Ground)
Connect it using an earth cable
made of soft copper with the diameter
of AWG16 (1.25mm
2 ).
Class D grounding
(Formerly Class-III grounding: Grounding resistance at 100
or less)
Controller
Controller
Other
equipment
Other
equipment
Other
equipment
Do not share the ground wire with or connect
to other equipment. Ground each controller.
(2) Precautions regarding wiring method
1) Twist the wires for the 24V DC power unit.
2) Separate signal lines and encoder cables from
high-power lines such as the power wire.
(3) Noise Sources and Elimination
Carry out noise elimination measures for power devices on
the same power path and in the same equipment.
The following are examples of measures to eliminate noise
sources.
1) AC solenoid valves, magnet switches and relays
[Measure] Attach the surge killer in parallel with the
coil.
2) DC solenoid valves, magnet switches and relays
[Measure] Attach the diode in parallel with the coil.
For the DC relay, use the built-in diode type.
Noise Killer
+24V
+24V
0V
0V
Relay
coil
Relay coil
R
C
+ -