AtlasPC Digital Control, Vol. I
Manual 85586V1
100
Woodward
Relay Information
Each relay has one set of normally open contacts and one set of normally closed
contacts. The relay contact ratings are:
5 A at 28 Vdc resistive
0.1 A at 125 Vdc resistive
3 A at 120 Vac resistive
2 A at 120 Vac inductive
0.241 hp—120 Vac motor
0.112 hp—28 Vdc motor
0.5 A at 120 Vac tungsten
Shielding
There is a terminal on the module labeled “SHLD”. A wire should be connected
between this terminal and a good local system ground. Alternatively, a ground
wire can be crimped to the bare shield wire at the Atlas end of the cable and then
tied to the chassis ground stud of the Atlas. If this shield wire is not used at the
Atlas end of the cable, it should be trimmed back to the insulation jacket of the
cable.
Board Status Lights
The module is equipped with twelve yellow LEDs to indicate when each relay has
been energized, and one green LED to indicate that there is external power to
the module. For proper operation, the green LED must be lit any time the Atlas
system is being used.
Wiring
The relay module requires an external 18 to 32 Vdc power supply and a wiring
harness. One end of this cable has been stripped back several inches, and
individual wires are labeled with the terminal numbers of the appropriate
terminals used on the Atlas power supply board. Refer to the following plant
wiring diagram and the power supply chapter of this manual for more details.
Summary of Contents for AtlasPC
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