25
Power Supply and FG Wiring
Section 2-2
(2) Use a DC power supply with little voltage fluctuation.
(3) Do not perform a dielectric strength test.
(4) To comply with the Low-voltage Directive in the EC Directives, use a pow-
er supply with reinforced insulation. Reinforced insulation is a single insu-
lation method that can protect against electrical shock to the same
degree as double insulation.
Recommended model: S82K-03024 (manufactured by OMRON)
(5) Insert a 3-A fuse immediately after the secondary output from the power
supply.
(6) To comply with UL-recognized standards, always use a Class 2 power supply.
A
Class 2 power supply refers to one in which the current and voltage levels
of the product’s secondary output are both limited (100 VA max.), and
which has undergone and passed the necessary tests for UL certification.
2-2-2
FG Wiring
The cable connected to the PT has a functional ground terminal (FG)
Wire them according to the conditions described below.
1,2,3...
1.
If there is a ground potential difference between the NSH5 and the host,
install them as shown in the following diagram.
Do not ground the PT if there is a distance between the PT and the ground
and one-point grounding is difficult.
2.
If the PT is installed in the same panel as a source of noise, such as a mo-
tor or an inverter, do not ground the PT.
Note
Be sure to ground correctly to prevent malfunctioning due to noise.
NSH5
Host
One-point grounding
Summary of Contents for NSH5
Page 2: ......
Page 4: ...iv ...
Page 12: ...xii ...
Page 16: ...xvi ...
Page 24: ...xxiv EC Directives 6 ...
Page 58: ...34 Installing the Mounting Bracket Section 2 5 ...
Page 86: ...62 Connection Method Section 4 5 ...
Page 92: ...68 Precautions When Replacing the PT Section 5 4 ...
Page 98: ...74 General Specifications Appendix A ...
Page 99: ...75 Appendix B Dimensions 75 50 176 223 75 Four M4 70 5 16 5 ...
Page 102: ...78 Types of Memory Appendix C ...
Page 107: ...83 Recommended Enabling Circuits Appendix D Program Example ...
Page 108: ...84 Recommended Enabling Circuits Appendix D ...