Power Supply; Grounding - Omron SYSMAC C Series User Manual

Installing the C20
Power supply
Use a commercially available DC 24V, AC 100 to 120V or AC 200 to 240V
power supply for the C20.
As the DC 24V power supply, Type 3G2A3-PS221 is available. Here are
the electrical specifications.
Power supply unit
Characteristics 3G2A3-PS221
AC 100/110/120V (AC 85 to 132V)/AC 200/220/240V
Input voltage {AC 170 to 264V), 50/60Hz+7Hz (AC 200V is the
factory-set condition)
Output voltage 24V+5%
Output capacity 1.5A max. (36W)
Efficiency 70% min.
Power failure Retains 10ms max.
Inrush current 5A max.
Fuse 2A, incorporated
Leakage current imA max. between FG terminal and ground
560g
Where possible, use independent power sources for the inputs, the load,
and for the CPU and expansion |/O units.
Grounding
Attach a dedicated grounding wire with a cross-sectional area of at least
2mm*(AWG14) to terminal FG to lessen the possibility of electrical shock.
Ground resistance must be less than 100Q.
Do not use a grounding wire longer than 20m. Care must be taken
because ground resistance is affected by the nature of the ground, water
content, season, and the amount of time that has elapsed since the wire
was laid underground.
In case a large noise occurs causing the C20 to malfunction, short-circuit
terminals LG and FG for grounding at a resistance of 100Q.
PC operation may be adversely affected if the grounding wire is shared
with other equipment or if grounding is attempted by attaching the
grounding terminal to the metal superstructure of a building.
Other equipment
Other equipment