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2-2
Section
Installation
28
2-2-3 Grounding
The NT620S/620C has a GR terminal.
The GR terminal is the earth grounding terminal; connect the special grounding
wire (2 mm
2
or larger) to this terminal to prevent electric shock. Carry out class 3
grounding (grounding resistance must be less than 100
Ω
).
Grounding wire length should be less than 20 m.
Note that if grounding wire is used in common with other equipment, or if it is con-
nected to a beam of a building, for example, the NT620S/620C might be adverse-
ly affected by this grounding.
Other
equipment
Other
equipment
Other
equipment
NT620S/
620C
NT620S/
620C
NT620S/
620C
Grounding common to several pieces of equipment:
…
Incorrect
Grounding for individual equipment:
…
Correct
Class 3 grounding
(grounding resistance
is 100
Ω
or less)
Caution
Carry out grounding correctly in order to prevent incorrect operation due to
noise.
Note
Carry out class 3 grounding, connecting the grounding wire to the GR terminal.
If grounding is not carried out there will be a danger of electric shock.
Summary of Contents for NT620C
Page 1: ...Cat No V033 E1 5 Programmable Terminals NT620S 620C OPERATION MANUAL...
Page 2: ...NT620S 620C Programmable Terminals Operation Manual Revised April 2001...
Page 3: ...iv...
Page 5: ...vi...
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