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Installing the PT
Section 3-1
3-1-3
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 DC power terminals.
? Use a DC power supply with low voltage fluctuation.
? Do not perform a dielectric strength test.
? Use a DC power supply that will provide a stable output even if the
input is momentarily interrupted for 10 ms, and which has reinforced
or double insulation.
Power Supply
The following table shows the specifications for the power supply that can be
connected. Determine power supply specifications that meet the power sup-
ply capacity requirements.
Item
Power supply voltage
Allowable voltage range
Power supply capacity
Value
24 VDC
21.6 to 27.6 VDC (24 VDC ? 10% to +15%)
12 W minimum
24 VDC
Functional
ground Breaker
Breaker
24 VDC
power supply
Precautions
for Safe Use
? Connect power to the power connector using twisted-pair power lines
with a cross-sectional area of at least 2 mm 2 (AWG14).
? The tightening torque of the terminal block is 0.51 N·m.
3-1-4
Wiring the Ground Wire
The PT is provided with a functional ground (FG:
) terminal.
Wire the FG terminal according to the following conditions.
1,2,3...
1. Ground according to Figure when there is difference in potential between
the PT and host. Do not ground the functional ground (FG: ) of the PT
if it is far from the host and one-point grounding is difficult.
2. Do not ground the functional ground (FG: ) of the PT if it is mounted to
the same panel as devices that generate noise, such as motors and invert-
ers.
PT
One-point
grounding
Host
20
Precautions
for Safe Use
Ground correctly to prevent malfunctions caused by noise.
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