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EN54-7A17
RED POWER
27
6.5. Input of collective failure: EXTi.
The EXT IN (external input) technical input indicating collective failure is intended for additional, external
devices that generate the failure signal. The voltage appearing at the EXT IN input will trigger PSU failure, storing
the information about the event in the internal memory and sending the signal about the failure to the ALARM
output.
The EXT IN technical input has been made with g
alvanic isolation between the PSU’s systems and the
attached devices.
Fig. 11. Electrical diagram of the EXT IN input.
The connection of external devices to the EXT IN input is shown in the electrical diagram below. OC
outputs (open collector) or relay outputs can be used as the source of the signal.
Fig. 12. Examples of connections.
In the option with external switch, the V
EXT
jumper, which polarises the EXT IN input circuit and is
required in such configuration, must be on.
The EXTi input has been adjusted to work with fuse modules generating a failure signal in case of a fuse
fault in any of output sections (see section 6.7). To guarantee a correct cooperation between the fuse module and
the EXTi input, the connections shall be made as presented in the diagram below and the V EXT jumper must be
on.
Fig. 13. Example of a connection with the fuse module EN54-LB8.
