Temperature Controller - Staveb AG

2-10 PreparationsWiring Input/Sensor DevicesConnect sensors to terminals 7…9 as follows according to the input type.Figure 2.87 8 9– +Thermocouple7 8 9A B BPlatinum resistancethermometer7 8 9– +VAnalog inputInput/Sensor Wiring Considerations• When the thermocouple leads are extended, make sure to usethermocouple extension wire matched to the type of thermocouple.• For a thermocouple, make sure to follow the polarity color codeconvention.• If there is a large error in the measurement values, make sure that inputcompensation has been properly configured.• RTDs can be either 2- or 3-wire types. If a 3-wire type is used, thecontroller provides lead wire resistance compensation up to 5 Ωresistance. If using 24 AWG lead wire, this is approximately 59 m ofwire. Use larger gauge wire if longer length is required.• For RTDs, the controller source is approximately 1 mA of current.• If a cooling fan is used in the panel enclosure, prevent only the terminalblock from being cooled when using thermocouples. Otherwise, thismay result in a measurement error.• To reduce induced electrical noise, the leads on the temperaturecontroller’s terminal block must be wired separately fromlarge-voltage/large-current power leads. Also, avoid wiring leads inparallel with power leads or in the same wiring path. Other methodssuch as separating conduits and wiring ducts, or using shield wire arealso effective.• When the platinum resistance detector leads are extended, use the leadhaving the smallest resistance to equalize the resistance of the threeleads.Publication 900-UM003C-EN-E - January 2004