Omron CP1H-CPU - 05-2006 Operation Manual page 149

Wiring CP1H CPU Units
Isolating Transformer
CPU Units with DC Power Supply
DC Power Supply Wiring
24 VDC
+
+
NC
118
• If one phase of the power supply is grounded, connect the grounded
phase to the L2/N terminal.
• The GR terminal is a ground terminal. To prevent electrical shock, use a
dedicated ground line (2 mm
• The line ground terminal (LG) is a noise-filtered neutral terminal. If noise
is a significant source of errors or if electrical shocks are a problem, con-
nect the line ground terminal (LG) to the ground terminal (GR) and ground
both with a ground resistance of 100
• To prevent electrical shock when short-circuiting between the LG and GR
terminals, always use a ground of 100
• Do not connect ground lines to other devices or to the frame of a building.
Doing so will reverse the effectiveness of the ground and instead have a
bad influence.
The PLC's internal noise control is sufficient for the general noise to which
power supply lines are subjected. Ground noise can be further reduced by
providing the power supply through a 1:1 isolating transformer. Leave the iso-
lating transformer's secondary side ungrounded.
Circuit protector
COM 01 03 05 07
00 02 04 06
GR: Protective ground terminal
Ground (100 or less)
• Use crimp terminals or solid wire for wiring the power supply. Do not con-
nect bare stranded wires directly to terminals.
6.2 mm max.
• M3 self-rising terminal screws are used. Tighten the terminal screws to
the torque of 0.5 N·m.
• To prevent noise, use a ground of 100
DC Power Supply
• Provide a power supply of 20.4 to 26.4 VDC unless there are two or more
Expansion Units and Expansion I/O Units. Provide a power supply of 21.6
to 26.4 VDC if there are two or more Expansion Units and Expansion I/O
Units.
• The maximum current consumption is 50 W per device.
• When the power supply is turned ON, the inrush current is approximately
five times the normal current.
• The GR terminal is a ground terminal. To prevent electrical shock, use a
dedicated ground line (2 mm
2
min.) of 100
Upper terminal block
09 11 01 03 05
08 10 00 02 04
6.2 mm max.
2
min.) of 100
Section 3-4
or less.
or less.
or less.
07 09 11
06 08 10
or less.
or less.