Eaton Alarm relay Card. UPS monitoring 66069 用户手册

 51029397EN/AB

 - Page 9

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,

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 relay 3 : Load protected,

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 relay 4 : Load on automatic bypass,

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 relay 5 : Load on battery power,

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 relay 6 : Low-battery warning.

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 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.