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Installation and User Manual
3.6 Environmental Signal of the Media Contacts 11 Board
Terminals XR2, XR3, XR4 and XR5 on the "Media Contacts 11" board of each type of unit can be used to receive
signals from the operating environment and to transmit signals concerning the operating status of the UPS, see
Figure 2-3, page 2—5 for the position of the board, item 1 and 2).
3.6.1 Signal Reception
The signals should be provided by volt-free contacts.
Emergency off: An NC contact causes shutdown of the inverter and the rectifier/charger, opening of
the battery circuit breaker, blocking of the static bypass and activation of a relay
contact on the "Media Contacts 11" board.
Battery room
ventilation fault: A ‘NO’ contact causes shutdown of the rectifier/charger.
Battery circuit
breaker QF1 closed: A ‘NO’ contact prevents inverter start-up if the circuit breaker is open.
Battery temperature: A PC-board, placed near the battery, supplies information on the battery tempera-
ture, thus enabling the rectifier/charger to regulate the battery voltage.
"Auxiliary" signals: Depending on the selected settings, these signals may be used to provoke:
- forced shutdown of the inverter (whatever the status of the bypass AC source),
- protected shutdown of the inverter (load transfer to the bypass AC source).
- limiting of the current drawn by the rectifier/charger (programmable value) when
supplied by an engine generator set with an insufficient power rating. The additional
power required by the inverter is supplied by the battery which discharges,
- limiting of the battery charge current (programmable value) if the normal AC source
is replaced by an engine generator set with an insufficient power rating.
3.6.2 Signal Transmission
An auxiliary 24 V
power supply: Isolated and backed up, is used to supply:
- the undervoltage release of the battery circuit breaker(s) QF1.
- the board that measures the temperature in the battery room.
"low battery"
warning signal: (Volt-free changeover contact) indicating that battery time is about to run out.
The warning threshold may be personalized.
"load on UPS" signal: (Volt-free changeover contact) indicating that the load is supplied by the
inverter. For a single-UPS unit, one volt-free changeover contact may be used
to indicate that the load is supplied by the bypass AC source.
Installation 3 — 786-133060-00 A00