APC DCM00K02W483 Datasheet download pdf (Page 39)

User Manual 990-9178A

DC MX06 40A Shelf Page 39 of 44 18

FEB 02

4.4 External Battery Installation

4.4.1 Battery Back-up function

Battery backup may be achieved by connecting 48V strings of batteries onto the external battery terminals

of the distribution module at the rear of the system. This battery string will be connected to the system bus

voltage via an internal LVD contact. If for any reason the rectifier outputs are not present, either by

component failure or by the loss of AC power then the battery string can supply the load for a limited time.

4.4.2 LVD Function

An internal LVD contact is fitted for battery string protection. Its function is to connect or disconnect the

battery string from the system bus. The LVD can be set to “ON”, “AUTO”, or “OFF”. In the On position the

batteries are connected to the system bus. In “Off” the connection is broken. In “Auto” the batteries are

connected to the system bus under normal system running conditions. If the system bus voltage falls the

battery string will supply the load. If the battery voltage then falls below 42Vdc the LVD contact opens and

disconnects the batteries to protect them. When system bus voltage is re-established the battery string will

be trickle charged until the battery voltage is >50Vdc and then the batteries will be reconnected to the

system.

4.4.3 Installation procedure

!!! CAUTION !!!

Only connect external battery strings of 48V to the MX06 40A Shelf.

External batteries MUST have circuit breakers fitted at source.

Observe the polarity of the external battery connector.

See section 4.3.4 for connection photo.

Note : It is possible to connect external battery strings of different capacities but the backup duration will be

affected.

• Ensure the battery breaker/s for the external batteries are in the ‘OFF’ position before

connecting external batteries.

• Set the front panel “battery connection” switch to “OFF”.

• Choose cables rated at 50A and colour coded to meet local installation regulations.

• Cables should be crimped with M5 ring crimps for connection to system battery terminals.

• Connect battery string to system ensuring correct polarity of connection.

• Conduct a final check before turning on the external battery breaker.

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APC DCM00K02W483 Datasheet Page 39