DC Controller
UPC4 Master
User Manual
Page 22/100
©2010. ELTEK VALERE DEUTSCHLAND GmbH. UM_UPC4_V2.00_E_R1.1_2011-01-04
PLD recognition at detection of mains failure (requires MMB) after expiration of an adjustable
time delay, reset after ending of mains failure.
(For details please see section 6.8 LVD/PLD/Drop diode
).
4.3.5 LVD function (total discharge protection)
The LVD (Low Voltage Disconnection) function makes it possible to protect the batteries against total
discharge.
The following criteria for LV recognition are available:
LVD recognition at under-run of an adjustable voltage threshold, reset after exceeding the
adjusted voltage threshold.
LVD recognition at detection of battery operation after expiration of an adjustable time delay,
reset after ending of battery operation.
LVD recognition at detection of mains failure (requires MMB) after expiration of an adjustable
time delay, reset after ending of mains failure.
(For details please see section 6.8 LVD/PLD/Drop diode
).
4.3.6 Battery asymmetry
It is possible to monitor the battery symmetry voltage in order to locate faulty batteries within a
battery string. Therefore, a voltage (symmetry voltage) is measured at a tap point of the battery string
and compared with the total battery string voltage.
If the batteries are okay, the measured symmetry voltage is equal to the symmetry voltage as
expect
ed.
If the measured symmetry voltage differs from the (adju
stable) value, the event "Unsymmetry" is
generated.
(For details please see section 6.4.6 Battery
).
4.3.7 Battery test
The battery test serves for the inspection of the batteries as well as for the inspection of the faultless
connection t
o the batteries.
This test can be executed by the following manners:
manually at the display (an external remote display RDD, RDP is required)
automatically by date and time
automatic repetition at selectable days
externally via MMT software, SNMP, Modbus
via digital input
Furthermore it is possible to suppress the bat
tery test via digital input.
(For details please see section 6.4.4 Service/Enable
).
The rectifiers’ voltages are reduced to an adjustable voltage value during the battery test.
ATTENTION!
This voltage value should be greater than the voltage threshold of the LVD/PLD
function. Otherwise the load supply could be disconnected during the battery
test if the batteries are faulty.
(192 paginas)
(78 paginas)
(80 paginas)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comentarios a estos manuales