Wiring externally powered measurement devices - CAB100

CAB100 Installation Guide
Document code
M212242EN
Revision
D
ft:locale
en-US
Product
CAB100
Document type
User guide
  • Red 5-pole plug-in bridges (3 pcs). The bridges are included in the CAB100B accessory bag (included in the delivery)
  • Small screwdriver
  • Wire cutters
  • Wire-stripping pliers
CAUTION

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.
To avoid measurement errors, make sure that the analog outputs of the external measurement device are galvanically isolated.

Follow the steps below to connect an externally powered measurement device, for example Vaisala Humidity and Temperature Transmitter Series HMT330 transmitter, to the CAB100B analog terminal block.

For instructions on using the 24 V DC power block in CAB100B for powering measurement devices, see Supplying power to external measurement device from CAB100B.

  1. De-energize the cabinet: switch off mains power and the circuit breaker located inside the cabinet.
    1
    Circuit breaker
  2. Disconnect the 24 V DC power cable connector of the analog terminal block from the power block.
  3. Disconnect the other end of the 24 V DC power cable from the analog terminal block.

    Remove the 24 V DC power cable from the cabinet.

  4. Remove the red and blue plug-in bridges, as well as the yellow filler plugs from the CAB100B analog terminal block.
    1
    Filler plugs
    2
    Red bridge
    3
    Blue bridge
  5. Move the data logger connector(s) to the top row of the analog terminal block.

    Insert 3 pcs 5-pole plug-in bridges in the row below the connector(s).

    1
    Data logger connectors
    2
    Red bridges
  6. Remove the black wire (= common wire) from the push-in terminal of the data logger connector(s).

    Reconnect the wire to the lower (negative) row of the analog terminal block. Connectors #5, #10, and #15 are reserved for the common wires.

    The 4 connectors to the left of each common wire are reserved for the analog output wires of your external measurement device.

  7. Strip approximately 10 mm (0.4 in) from the analog output wires of the external measurement device.
  8. Connect the positive wires in the upper row and the negative wires in the lower row of the CAB100B analog terminal block.

    The following figure shows CH1 … CH2 wires from 2 measurement devices connected.

    1
    CH1 … CH2 wires from device 1
    2
    CH1 … CH2 wires from device 2
  9. Connect the wires to the corresponding screw terminals inside the external measurement device (for example, the HMT330 transmitter).

    See the wiring instructions in the device-specific user documentation of the external measurement device.

  10. Reconnect power in the CAB100B cabinet.
    1. Switch on the circuit breaker.
    2. Switch on mains power.