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3 Nomenclature and Functions
CJ2 CPU Unit Hardware User’s Manual
3-5 Power Supply Units
3
3-5-3 Selecting a Power Supply Unit
After determining what power supply voltage is required, whether power output terminals and a RUN
output are required, and whether replacement notification is required, calculate the current and power
requirements for each Rack.
There are two voltage groups for internal power consumption: 5 VDC and 24 VDC.
For details on the current consumption of individual Units, refer to 2-1-4 Configuration Units.
z Current Consumption at 5 VDC
The following table shows the current that can be supplied to Units (including the CJ2 CPU Unit) that
use 5-VDC power.
z Current Consumption at 24 VDC
The following table shows the current that can be supplied to Units that use 24-VDC power supply.
The following table shows the maximum total power that can be supplied at 5 VDC and 24 VDC.
For details on the current consumption of individual Units, refer to 2-1-2 CPU Rack, 2-1-3 Expansion
Racks, and 2-1-4 Configuration Units. Refer to 2-1-5 Calculating Unit Current Consumption for an
example of calculating the current consumption.
3-5-3 Selecting a Power Supply Unit
Condition 1: Current Requirements
Model Maximum current at 5 VDC
CJ1W-PA205R/205C 5.0 A
CJ1W-PA202 2.8 A
CJ1W-PD025 5.0 A
CJ1W-PD022 2.0 A
Model Maximum current at 24 VDC
CJ1W-PA205R/205C 0.8 A
CJ1W-PA202 0.4 A
CJ1W-PD025 0.8 A
CJ1W-PD022 0.4 A
Condition 2: Power Requirements
Model Maximum total power output
CJ1W-PA205R/205C 25 W
CJ1W-PA202 14 W
CJ1W-PD025 25 W
CJ1W-PD022 19.6 W
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