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Power Supply Units Section 3-4
3-4-4 Power Supply Confirmation
After determining what power supply voltage is required, whether power out-
put terminals and a RUN output are required, and whether replacement notifi-
cation is required, calculate the current and power requirements for each
Rack.
Condition 1:
Current Requirements
There are two voltage groups for internal power consumption: 5 V DC and
24 V DC.
Current Consumption at 5 V DC (Internal Logic Power Supply)
The following table shows the current that can be supplied to Units (including
the CPU Unit) that use 5-V DC power.
Current Consumption at 24 V DC (Relay Driving Power Supply)
The following table shows the current that can be supplied to Units that use
24-V DC power.
Condition 2:
Power Requirements
The following table shows the maximum total power that can be supplied at
5 V DC and 24 V DC.
Refer to
2-6 Unit Current Consumption for tables showing the current con-
sumed by each particular Unit as well as example calculations.
3-4-5 Replacement Notification
Principle of Replacement Notification
The Power Supply Unit has a built-in electrolytic capacitor. The electrolytic
capacitor is impregnated with electrolytic solution that starts to penetrate the
sealing rubber from the time of manufacture. As time elapses, the internal
electrolytic solution continues to evaporate, resulting in decreased electro-
static capacity and deterioration in other characteristics. Over time, the char-
acteristic deterioration of the electrolytic capacitor prevents the Power Supply
Unit from being utilized to its full capacity. In particular, the speed at which the
electrolytic capacitor deteriorates fluctuates greatly with the ambient tempera-
ture (generally, a temperature rise of 10
°C will double the rate of a reaction, as
stated by Arrhenius' law).
The CJ1W-PA205C Power Supply Unit with Replacement Notification moni-
tors the internal temperature of the Power Supply Unit while the power is
Power Supply Unit Maximum current at 5 V DC
CJ1W-PA205R/PA205C 5.0 A
CJ1W-PA202 2.8 A
CJ1W-PA025 5.0 A
CJ1W-PA022 2.0 A
Power Supply Unit Maximum current at 24 V DC
CJ1W-PA205R/PA205C 0.8 A
CJ1W-PA202 0.4 A
CJ1W-PA025 0.8 A
CJ1W-PA022 0.4 A
Power Supply Unit Maximum total power output
CJ1W-PA205R/PA205C 25 W
CJ1W-PA202 14 W
CJ1W-PA025 25 W
CJ1W-PA022 19.6 W
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