Wiring and powering loop-powered measurement devices - CAB100

CAB100 Installation Guide

Document code
English (United States)
Document type
User guide
  • Small screwdriver
  • Wire cutters
  • Wire-stripping pliers

CAB100 analog input channels are not surge protected. Therefore, note the following:

  • The analog input channel wiring must not exceed 30 meters.
  • The wiring must not come from outside the building where CAB100 is installed.

If CAB100 cannot be installed in an environment that meets the above criteria, use a suitable surge protection device that has been installed following local regulations.

CAUTION Before connecting any external measurement device to CAB100, refer to the wiring instructions in the device-specific user documentation.
CAUTION Loop-powered and externally powered measurement devices cannot be connected in the same analog channel terminal block.

Follow the steps below to connect a loop-powered measurement device, for example Vaisala Humidity and Temperature Transmitter Series HMT120 transmitter, to the CAB100 analog terminal block. Note that once connected, the loop-powered device is powered via the CAB100 analog terminal block.

  1. De-energize the cabinet: switch off mains power and the circuit breaker located inside the cabinet.
    Circuit breaker
  2. Disconnect the analog channel 24 V DC power cable connector from the power block, located on the right-hand side of the cabinet.
  3. Strip approximately 10 mm (0.4 in) from the analog output wires of the external measurement device.
  4. Insert the wires in the push-in terminals of the CAB100 analog terminal block.