Alarm relay Card. UPS monitoring, six output relays.
The relay card may be used in all UPSs equipped with UPS BUS communications slots or in a MultiSlot module.
The card:
◗ Controls six output relays depending on the operating status of the UPS.
◗ Receives signals on the two SELV inputs (this function is available only in programmable mode).
There are three operating modes:
◗ Standard mode: the relays are controlled when the UPS changes a status condition. The following information is transmitted:
◗ relay 1 : General alarm,
◗ relay 2 : Battery fault,
◗ relay 3 : Load protected,
◗ relay 4 : Load on automatic bypass,
◗ relay 5 : Load on battery power,
◗ relay 6 : Low-battery warning.
◗ Programmable mode: relays 1 to 6 are controlled directly by the UPS and all changes of state on inputs A and B are transmitted to the UPS. In this mode, the control logic for the output relays and management of the inputs is integrated in the UPS (see the UPS user manual).
◗ Load-shedding mode: relays 1 to 6 are controlled during operation on battery power. The load-shedding sequence is the
following:
◗ load transferred to battery power => relays 4, 5 and 6 are opened,
◗ low-battery warning issued => relays 1, 2 and 3 are opened,
◗ return of AC-input power => relays 1 to 6 are closed, with a 2-second delay between each closing order.