Concept
Wire Sizes and Lengths for the RP-V Controllers
This section provides recommendations on wire sizes and lengths for the RP-V controllers.
For more information, see RP-V Models .
The recommendations are for guidance only. Other wire sizes and lengths may be used, depending on wiring rules and when appropriate.
With central transformer wiring, the wire length (distance to the transformer) must be limited to maintain minimum 24 VAC power level to the RP-V controller. Larger wire size (cross-sectional area) helps reduce voltage drop on the 24 VAC line. For more information, see Grounding and Power for Systems with RP-V Controllers .
|
Terminals |
Minimum Cross-sectional Area |
Maximum Cable Length |
|
Power input terminals (1, 2) |
0.75 mm² (18 AWG) a |
According to local wiring rules b |
|
Earth ground terminal (3) |
0.75 mm² (18 AWG) a |
Protective earth ground connection on or within the controller panel |
|
RS-485 terminals (12, 13, 14) c |
For more information, see RS-485 Communications . |
For more information, see RS-485 Communications . |
|
Universal inputs/outputs as digital d inputs |
0.34 mm² (22 AWG) |
200 m (650 ft) |
|
Universal inputs/outputs as analog e inputs |
0.34 mm² (22 AWG) |
100 m (330 ft) |
|
Universal inputs/outputs as temperature (thermistor) inputs, up to 75 °C (167 °F) |
0.75 mm² (18 AWG) |
75 m (250 ft) |
|
Universal inputs/outputs as temperature (thermistor) inputs, up to 75 °C (167 °F) |
1.5 mm² (15 AWG) |
150 m (500 ft) |
|
Universal inputs/outputs as temperature (thermistor) inputs, up to 150 °C (302 °F) |
1.5 mm² (15 AWG) |
75 m (250 ft) |
|
Universal inputs/outputs, for actuators and transmitters powered from the same transformer as the RP-V controller |
0.75 mm² (18 AWG) |
20 m (65 ft) |
|
Universal inputs/outputs, for actuators and transmitters powered from their own transformer (external or internal) |
0.34 mm² (22 AWG) |
200 m (650 ft) |
|
Universal inputs/outputs as voltage outputs, for actuators powered from their own transformer (external or internal) or when the outputs have isolated converters |
0.34 mm² (22 AWG) |
200 m (650 ft) |
|
Solid-state relay (SSR) outputs |
According to local wiring rules f |
According to local wiring rules f |
- Use wires rated for at least 90 °C (194 °F).
- With central transformer wiring, the wire length (distance to the transformer) must be limited to maintain minimum 24 VAC power level to the RP-V controller. Larger wire size (cross-sectional area) helps reduce voltage drop on the 24 VAC line.
- Only available on the RP-V-5C-M controller model.
- Digital or counter inputs.
- Supervised, voltage, current, or resistive inputs.
- Confirm the voltage drop from the external load current and the wire resistance (the product of the wire size and length) to obtain the appropriate voltage arriving at the controlled field device (load), to reliably energize and maintain the control action.
I/O Wiring
Wire Sizes and Lengths
RP-V Controllers
RP-V Models
RP-V Screw Terminals
Wiring
RS-485 Communications
Grounding and Power for Systems with RP-C 230 V Controller Models and RP Controller Expansion Modules