www.pulsar.pl EN54M RED POWER plus
5.2. 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. Disconnection of the EXTi terminals will cause a failure of the PSU and
generate a failure signal at the ALARM output.
The EXTi technical input is not galvanically isolated from the power supply. The "minus" terminal is
connected to the power supply.
The connection of external devices to the EXT IN input is shown in the electrical diagram below. Relay
outputs or "open collector" signal outputs can be used as the signal source.
Fig. 8. Connections to the EXTi input.
The EXTi input has been adjusted to work with EN54C-LB4 and EN54C-LB8 fuse modules generating a
failure signal in case of a fuse fault in any of output sections (see section 5.6.1). To guarantee a correct
cooperation between the fuse module and the EXTi input, the connections shall be made as presented in the
diagram below.
Fig. 9. Example of a connection with the fuse module EN54C-LB8.
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