Eltek Valere UNV-F 2.5 Manual de usuario descargar pdf (Pagina 21)

DC Controller

UPC4 Master

User Manual

Page 21/100

4.3.2 Charge current limitation

Figure 7. Diagram “Charge current limitation”

Discharged batteries, e.g. after backup operation, are charged with an adjustable maximum current

unti

l the value of the temperature-controlled trickle charge voltage is reached. The battery voltage is

measured at the beginning of the battery charging. Commencing with this battery voltage, the output

voltage of the rectifiers is increased accordingly so that the set maximum of the battery charging

current is reached. This process is retained as long as the output voltage has reached the value of the

trickle charge voltage (temperature-controlled).

(For details please see section 6.4.3 Charge Control

4.3.3 Autarkic rectifier operation

(Emergency operation)

If the rectifiers do not receive a control signal, e.g. because of

 breakdown of the UPC4,

 breakdown of the CAN-Bus connection (e.g. cable break),

the rectifiers self-acting return to a constant output voltage as default.

Example: Rectifiers of a 48 VDC system return to default voltage value of 54.5 V (factory preset).

At battery backed systems this operating mode should be seen as an emergency operation.

4.3.4 PLD function (Power Load Disconnect)

The PLD function makes it possible to disconnect inferior priority loads during battery backed

operation. Due to this the backup time of more important loads is extended.

There is the possibility to configure up to two consu

mer load levels (inferior priority loads)

independently of each other.

The following criteria for PLD recognition are available:

 PLD recognition at under-run of an adjustable voltage threshold, reset after exceeding the

adjusted voltage threshold.

 PLD recognition at detection of battery operation after expiration of an adjustable time delay,

reset after ending of battery operation.

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Eltek Valere UNV-F 2.5 Manual de usuario Pagina 21