APPLICATIONS

The 23BA23 board is used for the remote terminal unit RTU560.

The 23BA23 board should be installed if you need to check the output circuitry for object commands before issuing the actual command.

The 23BA23 board performs an “n select 1” check. It checks whether only one intermediate relay is activated in the output circuit.

This is only feasible if all mutually exclusive relays connected to a check circuit have the same resistance value. have the same resistance value.

23BA23 The board allows two separate check circuits to be used to check two different types of interlocking relays.

The allowable tolerance ranges are defined by parameters.

A maximum of 16 23BA23 boards can be used with one RTU560.

In RTU560 systems, the 23BA23 board is only functionally and pinout compatible with the 23BA22 board.

The 23BA23 board is only functionally and pin compatible www.cniacs.com with the 23BA22 board in an RTU560 system.

The basic additional tasks are as follows

Checking the galvanic isolation of the circuit

Suppress line frequency during measurement

Characteristics

Figure 1 shows the connection of the binary output boards 23BA20 and 23BA23 at two-pole startup for (n select 1) checking.

The check circuit for measuring the relay coil resistance is galvanically isolated from the electronic voltage and the switching voltage (UD) of the intermediate relay.

This is achieved by means of galvanically isolated DC/DC converters and optocouplers.

No auxiliary test voltage is required. During the measurement, the 23BA23 board switches the corresponding check circuit (P1 or P2) to both poles, thus separating the two.

During the check (1 out of n), the 23BA23 board measures the resistance value in the output circuit and compares this value with the configured upper and lower limits.

If the resistance value is within the limit values, the selected interlock relay can be activated. The object command will be acknowledged.

If the measured resistance value is outside the permissible range, the 23BA23 blocks the output and displays an error to the CMU (CMU = communication unit).

The CMU controls and coordinates the corresponding 23BA20 and 23BA23 boards.