Campbell CNR4 Manuál s instrukcemi stáhnout pdf (Strana 63)

Appendix D. CNF4 Heater/Ventilator

D.3 Wiring

The following table shows the recommended datalogger wiring for using the

CNR4 sensor with the CNF4 heater/ventilator while making the differential

measurement.

TABLE D-1. CR1000 and CR3000 Datalogger Connections for

Differential Measurement with Heater/Ventilator Control

Function Wire Color CR6, CR1000, CR3000

Pyranometer Up Signal Red Differential Input (H)

Pyranometer Up Reference

*Blue

Differential Input (L)

Pyranometer Down Signal White Differential Input (H)

Pyranometer Down Reference *Black Differential Input (L)

Pyrgeometer Up Signal Grey Differential Input (H)

Pyrgeometer Up Reference

*Yellow

Differential Input (L)

Pyrgeometer Down Signal Brown Differential Input (H)

Pyrgeometer Down Reference *Green Differential Input (L)

Shield Clear

Thermistor

Thermistor Signal White Single-Ended Input

Thermistor Voltage Excitation Red

Voltage Excitation

(VX)

Thermistor Signal Reference Black

Shield Clear

CNF4 Heater/Ventilator

Ventilator Power

Red

SW12V

Ventilator Ground Blue G

Heater Power Green SW12V

Heater Ground Yellow G

Shield

Clear

*Jumper to with user supplied wire

Pull back wires for Pt-100 (grey, brown, green, and yellow), which are not in

use, and tie them around the TEMP cable using a cable tie or electrical tape to

avoid possible damage to the Pt-100, due to electrical short circuit.

Do not use the datalogger’s switched 12 V to simultaneously

power the heater and ventilator. Simultaneously powering

the heater and ventilator will exceed the current limit of the

switched 12 V channel. If the heater and ventilator need to

be used at the same time, connect the CNF4 to the 12V

channel instead of the switched 12 V channel and use an

external relay to switch the power on and off. Refer to

Section 4.1 of the CR1000 and CR3000 manual for details

on the 12V current source limits.

CAUTION

D-7

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