3-1 Installing the PT
3-7
3-1-4 Connecting the Power Supply
Connect a 24-VDC power supply to the power input terminals.
Precautions
for Safe Use
• Do not connect an AC power supply to the power terminals.
• Use a DC power supply with low voltage fluctuation.
• Do not perform a dielectric strength test.
• To conform to EC Directives, use a DC power supply that will provide a sta-
ble output even if the input is momentarily interrupted for 10 ms, and that
has reinforced or double insulation.
• Power Supply
The following table shows the specifications for the power supply that can be connected. De-
termine power supply specifications that meet the power supply capacity requirements.
Item Value
Power supply voltage 24 VDC
Allowable voltage range
20.4 to 27.6 VDC (24 VDC ±15%)
Power supply capacity 45 W min. (NS15)
25 W min. (NS12, NS10, NS8)
15 W min. (NS5)
24 VDC
Breaker
Functional ground
Breaker
Functional
ground
24 VDC
power
supply
24 VDC power supply
24 VDC
NS15, 12, 10, 8 NS5
• Parts Used to Connect the Power Supply
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