9 – 77
Exception Status Bits
The Exception Status Bits are accessed using the following functions:
07 Read Exception Status - Reads the state of the Exception Status Bits
Further information about the application of these inputs and outputs is given in the "WL Modbus RTU Communication Manual" WL
Low Voltage Power Circuit Breaker catalog.
Catalog number
9.2.2.6 Metering function PLUS
Trip units ETU745 - ETU776 can be equipped with a metering function PLUS. This, however, requires external voltage transformers
providing a three-phase metering voltage (such as the Siemens WL3VT).
This data can be shown on the display of the trip units, transmitted by the COM module via PROFIBUS DP, PROFINET IO, Modbus RTU,
or Modbus TCP, and passed on to the outputs of external c modules. Based on this data, conclusions can be drawn about the
condition of the power system. To use the metering function without communication, an external 24 V auxiliary voltage supply is required.
In addition to the values for the currents, the metering function PLUS provides data on voltages, powers, energy values, power factors and
frequency via the
cfor further processing.
Bit Description
0 Excessive breaker contact wear
1 Communication with trip unit OK
2 COM16 is OK
3 - 7 Reserved
Catalog No.
WL Breaker Configuration Software POWERCONFIG
NOTICE
High voltages may damage the MeteringPLUS module.
The secondary voltage of the external voltage transformers must not exceed 150 V AC RMS or 300 V AC peak value.
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