Omron CJ2 CPU UNIT - DC Power Supplies; Power Supply Capacity; Wiring in Which the 24-V Power Supply will Short

5 Installation
5-22
CJ2 CPU Unit Hardware User’s Manual
z CJ1W-PD025 Power Supply Unit
z DC Power Source
Supply 24 VDC. Keep voltage fluctuations within the specified range.
z 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.
z Precautions when Using CJ1W-PD022 Non-insulated Power Supply Units
DC Power Supplies
Model Allowable voltage fluctuation range
CJ1W-PD025
19.2 to 28.8 VDC (±20%)
CJ1W-PD022
21.6 to 26.4 VDC (±10%)
! Caution
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
POWER
PD025
DC24V+
INPUT
NC
NC
DC power supply
Screw terminals (M4 head with
self-raising pressure plate)
24 V
0 V
FG
FG
0 V
0 V
CPU Unit
Non-insulated
DC power supply
Power Supply
Unit
Peripheral
cable
Peripheral device (e.g.,
personal computer)