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Safety Considerations
Inductive Load Surge
Suppressor
Electrical Noise
52
When an inductive load is connected to an I/O Unit, connect a surge sup-
pressor or diode in parallel with the load as shown in the following diagram.
This is so that the back electromagnetic field generated by the load will be
absorbed.
Resistor:
50 W
µ
Capacitor: 0.47
F
Voltage:
200 V
Diode:
Must withstand voltages of more
than three times the load voltage and an av-
erage current of 1 A
L
Relay Output Unit
Triac Output Unit
Relay Output Unit
Transistor Output Unit
Take appropriate measures when any electrical device likely to produce
noise is connected to the PC as a load. Devices generating noise of more
than 1,200 V (such as electromagnetic relays and valves) require noise sup-
pression. For noise sources running on AC power, connect a diode in parallel
with the coil of each device.
When mounting a CPU Rack and an Expansion I/O Rack together on a
mounting plate, provide a solid ground to the mounting plate. The mounting
plate must be plated with a highly conductive surface in order to ensure noise
immunity.
IN
DC Input
Diode
COM
L
OUT
Surge suppressor
COM
L
OUT
Diode
COM
Section 7
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