Section 7
Safety Considerations
52
Inductive Load Surge
Suppressor
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.
Relay Output Unit
Transistor Output Unit
L
OUT
COM
Surge suppressor
L
OUT
COM
Relay Output Unit
Triac Output Unit
+
Diode
L
IN
COM
Diode
DC Input
Resistor: 50
W
Capacitor: 0.47
µ
F
Voltage: 200
V
Diode:
Must withstand voltages of more
than three times the load voltage and an av-
erage current of 1 A
Electrical Noise
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.
Summary of Contents for SYSMAC C500
Page 1: ...Cat No W132 E1 4 Programmable Controller SYSMAC C500...
Page 2: ...C500 Programmable Controller Installation Guide Revised May 2000...
Page 37: ...29 SECTION 4 System Connections 4 1 Current Consumption 30 4 2 I O Connections 33...
Page 49: ...43 SECTION 6 Power Considerations...
Page 54: ...49 SECTION 7 Safety Considerations...
Page 58: ...53 A Inspection and Maintenance 54 B Specifications 57 C Standard Models 97 Appendix...
Page 96: ...Appendix B Specifications 91 A shape I O Unit B shape I O Unit...
Page 97: ...Specifications Appendix B 92 C shape I O Unit D shape I O Unit...