Table Appendix B-1 External Wiring - Honeywell VPR100 User Manual

Wire Function
No.
HIGH VOLTAGE
1
Line Power
2
Earth Ground
3 Line Voltage
Digital I/O
ANALOG I/O
4
Process Variable
RTD
Thermocouple
dc Millivolts
5
Low Level (<100V)
4-20 mA dc
1-5 Vdc
DIGITAL I/O
6 Low Voltage (<100V)
7 Computer Interface
Additional rules
Please observe these additional rules for wire bundling:
•
For distances over five (5) feet, and when shielding is recommended, use a separate metal tray or
conduit for each bundle. Where conduits or trays are not practical, use twisted wires with a metal
overbraid and provide physical separation of at least one foot.
•
Tray covers must be in continuous contact with the side rails of the trays.
•
When unlike signal levels must cross, either in trays or conduits, they should cross at a 90-degree angle
and at a maximum spacing. Where it is not possible to provide spacing, a grounded steel barrier or grid
should be placed between the unlike levels at the crossover points.
•
Trays containing low level wiring should have solid bottoms and sides. Tray covers must be used for
complete shielding. Tray cover contact with side rails must be positive and continuous to avoid high
reluctance air gaps, which impair shielding. Trays for low level cables should be metal and solidly
grounded.
•
Wires containing low level signals should not be routed near any of the following:
– Contactors,
– Motors,
– Generators,
– Radio transmitters, and
– Wires carrying high current that is being switched on and off.
•
Use a 12-gage (or heavier) insulated stranded wire for the ground connection. Attach it firmly to a
proven good earth ground such as a metal stake driven into the ground.
•
All shields should be grounded at one end only — preferably the instrument end.
12/00

Table Appendix B-1 External Wiring

Bundle No.
Type
VPR & VRX – User Manual
Are Shielded Twisted Wires
Recommended?
1
2
3
Appendix B
NO
YES
YES
297