Wiring; Ac Power Supply Wiring; Power Failure - Omron SYSMAC C200H Installation Manual

Wiring

Power Failure

6-4 Wiring
C200H-CPU01-E/CPU11-E
C200H-PS221

AC Power Supply Wiring

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A sequential circuit is built into the PC to handle power interruptions. This circuit
prevents malfunctions due to momentary power loss or voltage drops. A timing
diagram for the operation of this circuit is shown below.
The PC ignores all momentary power failures if the interruption lasts no longer
than 10 ms. If the interruption lasts between 10 and 25 ms, the interruption may
or may not be detected. If the supply voltage drops below 85% of the rated volt-
age for longer that 25 ms (less for the DC Power Supply), the PC will stop operat-
ing and the external outputs will be automatically turned OFF. Operation is re-
sumed automatically when the voltage is restored to more than 85% of the rated
value.
The following diagrams show the proper way to connect the power source to the
PC. The terminals marked "NC" are not connected internally.
Screw (3.5 mm head with
self-raising pressure plate)
Voltage selector
Short: 100 to 120 VAC
Open: 200 to 240 VAC
Short-circuit these termi-
nals with the shorting
bracket supplied as an
accessory to select 100
to 120 VAC supply volt-
age. For 200 to 240 VAC
leave them open.
Screw (3.5 mm head with
self-raising pressure plate)
Voltage selector
Short: 100 to 120 VAC
Open: 200 to 240 VAC
Short-circuit these terminals
with the shorting bracket
supplied as an accessory to
select 100 to 120 VAC sup-
ply voltage. For 200 to
240 VAC, leave them open.
2
Use 1.25-mm cables or larger. The terminal blocks have screws with 3.5-mm
diameter heads and self-raising pressure plates. For connecting to the terminal
blocks, use round crimp terminals for 3.5-mm diameter heads. Directly connect-
ing stranded wires to the terminal blocks may cause a short-circuit.
Breaker
AC power source
1:1 isolation •
transformer
120 or 200 to 240
VAC
•
Isolation transformer
fluctuations within
•
Noise between the PC
the specified range
and ground can be sig-
(refer to Appendix
nificantly reduced by
B Specifications )
connecting a 1-to-1 iso-
lation transformer. Do
not ground the second-
ary coil of the transform-
er.
Power line
•
Use AWG 14 twisted
pair cable (cross-section-
2
al area of 2 mm min).
Section 6-4
Supply 100 to
Keep voltage
53