Dc Power Supplies; Power Supply Capacity; Wiring In Which The 24-V Power Supply Will Short - Omron CJ2 CPU UNIT User Manual

5 Installation

DC Power Supplies

CJ1W-PD025 Power Supply Unit
DC power supply
DC Power Source
Supply 24 VDC. Keep voltage fluctuations within the specified range.
Model
CJ1W-PD025
CJ1W-PD022

Power Supply Capacity

The maximum power consumption is 50 W (CJ1W-PD025)/35 W (CJ1W-PD022) per Rack, but there
will be a surge current of about five times that level when the power is turned ON.
Precautions when Using CJ1W-PD022 Non-insulated Power Supply Units
When connecting a personal computers or other peripheral devices to a PLC to which a non-
insulated Power Supply Unit (CJ1W-PD022) is mounted, either ground the 0 V side of the
external power supply or do not ground the external power supply at all ground. A short-cir-
cuit will occur in the external power supply if incorrect grounding methods are used. Never
ground the 24 V side, as shown below.

Wiring in Which the 24-V Power Supply Will Short

Non-insulated
24 V
DC power supply
0 V
FG
Power Supply
Unit
5-22
PD025
POWER
DC24V+
Allowable voltage fluctuation range
±
19.2 to 28.8 VDC ( 20%)
±
21.6 to 26.4 VDC ( 10%)
! Caution
Peripheral
cable
0 V
Peripheral device (e.g.,
CPU Unit
personal computer)
Screw terminals (M4 head with
self-raising pressure plate)
INPUT
NC
NC
0 V
FG
CJ2 CPU Unit Hardware User's Manual