Omron CV500 Installation Manual page 64

Power Supply Units
3-4-1 Wiring the Power Source
AC Power Supply Units: CV500-PS221/CVM1-PA208
! Caution
WARNING
!
The following diagrams show the proper way to connect the power source to the
Power Supply Unit. The terminals marked "NC" are not connected internally.
Screw (3.5 mm head with
self-raising pressure plate)
1:1 isolation
transformer
Power Line
Isolation transformer
Use AWG 14
Noise between the PC
twisted-pair cable
and ground can be signif-
(cross-sectional
2
icantly reduced by con-
area: 2 mm min.
necting a 1-to-1 isolation
transformer. Do not
ground the secondary
coil of the transformer.
Use round crimp terminals for wiring. Do not connect bare stranded wires direct-
ly to terminal blocks. Use M3.5 screws for tightening crimp terminals.
7 mm max.
Tighten the screws on the terminal block of the AC Power Supply Unit to a torque
of 0.8 N m. The loose screws may result in short-circuit, burning, or malfunc-
tion.
20 mm max.
Tightening torque: 0.8 N m
Do not allow your hands or any other part of your body, or any object in contact
with your body, to come into contact with the AC power supply section after
power has been turned on. Contact with the power supply section will result in a
dangerous or fatal electrical shock.
AC power source
Breaker
Supply 100 to 120 or
200 to 240 VAC
Keep voltage fluc-
tuations within the spe-
cified range (refer to
Appendix B Specifica -
tions )
M3.5 screw
Section 3-4
51