3
INSTALLATION INSTRUCTION
Asia-Pacific
+86 755 298 85888
Europe, Middle East
+353 61 225 977
North America
+1
408
785 5200
© 2020 Bel Power Solutions & Protection
BCM.00546_AC
OPERATING MODE
UPS MODE
UPS Mode:
In UPS mode the LDD960-UU protects a load from unwanted power interruption in
case of mains failure. An example of UPS connection is given on to the side. When
the input is present LDD960-UU acts as a bypass, connecting the input to the output
via the input switch. Meanwhile, if required, the battery is charged. During bypass
there is no voltage conversion, therefore the output supply voltage is equal to the
input voltage.
In case of power outage, the LDD960-UU takes energy from the battery to keep the
output regulated at “
Nominal output voltage
”.
Backup:
The system is in backup mode if the supply for the output is sourced from the battery
(input supply missing). During backup the battery is monitored continuously to
prevent over discharge.
A programmable backup timer is also implemented in order to fix a maximum backup
time during power outages. This allows preserving the battery life and shortening the
recharge time, avoiding discharging the battery when not needed. During backup the
internal Coulomb counter is used to give an estimate of the residual charge of the
battery.
Backup starts when the output voltage is lower than 90% of the “
Nominal output
voltage
”.
Battery charger:
The battery charger supports various chemistries such Lead-Acid, Nickel, Lithium and
Super-capacitors. Other charging algorithms can be implemented by request (contact
factory).
The battery charger automatically reduces the current to avoid exceeding the
maximum input current in case of high current load.
Warnings:
-
In order to avoid potentially hazardous situations including fire hazard, safety recommendations must be followed. Only authorized staff can install
the unit.
-
For Lithium cells the balancing and protection circuit must be included in the battery pack.
-
For Nickel batteries the use of the external temperature sensor is mandatory. The sensor must be placed in contact with the battery.
DC-DC MODE
DC-DC Mode:
LDD960-UU can be used as a high performance DC/DC converter.
An example of DC/DC connection is given on to the side.
Any voltage between 10 V to 55 V can be converted to any voltage between 10 V to
55 V (step-up and step-down operation) with up to 20A input or output current.
Input and output are protected against over current with user settable limits. When
used as a DC/DC converter the input supply must be connected to the battery
connector as shown on to the side.
