Power Supply Units
Section 3-4
3-4-1 Wiring the Power Source
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.
AC Power Supply Units: CV500-PS221/CVM1-PA208
Screw (3.5 mm head with
self-raising pressure plate)
AC power source
Supply 100 to 120 or
200 to 240 VAC
Keep voltage fluc
Breaker
•
1:1 isolation
transformer
•
-
Power Line
tuations within the spe
-
Isolation transformer
Noise between the PC
and ground can be signif
icantly reduced by con
cified range (refer to
Appendix B Specifica
• Use AWG 14
twisted-pair cable
(cross-sectional
•
-
tions)
-
2
-
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.
Caution Tighten the screws on the terminal block of the AC Power Supply Unit to a torque
!
of 0.8 N
tion.
S
m. The loose screws may result in short-circuit, burning, or malfunc-
20 mm max.
M3.5 screw
Tightening torque: 0.8 N S m
WARNING 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.
!
51
OMRON [ OMRON ELECTRONICS LLC ]
