RKC INSTRUMENT SR Mini System, Руководство по эксплуатации оборудования

Страница: 67 / 112

5. WIRING
IMSRM02-E6
61
„ „ „ „ Input/output wiring
•
For thermocouple input, use the appropriate compensation wire.
•
For RTD input, use low resistance lead wire with no difference in resistance between the three lead
wires.
•
Use independent ducts for the input/output wires and power circuits inside and outside the panel.
•
If input/output wires have to be placed in the same duct as the power circuits, use shielded wires.
Ground the shield to reject any noise generated by the floating capacitance between the cores and
shield or by a grounding potential.
Example: When signal source is grounded, ground the shield to the signal source side.
Example: When signal source is not grounded, ground the shield to the instrument side.
„
„ „
„ Ground wiring
•
Ground the instrument separately from other equipment. The grounding resistance should be 100
Ω
or less.
•
Use grounding wires with a cross section area of 2.0 mm2 or more.
Insulation
Other
equipment
Control unit 1
Ground terminal
Ground terminal
Ground (Resistance of 100
Ω
or less)
Control unit 2
„ „ „ „ FAIL output wiring
Configure the external relay circuit of the FAIL output so that instrument failure does not affect the
entire system. Configuration of an emergency stop circuit is also required to protect the system.
Shield
Signal source
Instrument
Shield
Signal source
Instrument