Operating instructions

Protect 5.31/xxx-480-220-120 10 kVA - 120 kVA
Page 43 of 56 8000020680 BAL, en
10 Annex
10.1 Battery Handling using the Graphical DOU
10.1.1 Charging the Battery
The battery is charged according to DIN 41772 in accordance with a
CVCC curve. This ensures that the battery is charged in the shortest
possible time and also prevents overcharging.
Battery charging is electronically controlled and monitored. Operating
faults are registered, causing the charging process to be interrupted.
Charging:
After a mains failure, for example, the battery is charged with a
constant current (e.g. 20 A/100 Ah). When the charging voltage is
reached (e.g. 2.35 V/cell for lead-acid cells), the control electronics
maintains this voltage constant at ± 1% with decreasing current.
When the calculated charging time has elapsed, the battery is
switched over to trickle charging.
Trickle charging:
When the electronically controlled charging has been carried out, the
control unit switches over to trickle charge voltage (e.g. 2.27 V/cell).
Further operating modes are available for special treatment of the
battery, providing they are implemented in the UPS. These can be
manually activated via the graphical DOU in the "SERVICE / REC
OPERATING MODE" menu.
The works setting of the characteristic values can be changed via the
DOU in the menu "SERVICE / BATTERY VALUES". This allows ideal
adaptation to the existing battery.
Equalising charging:
Equalising charging is carried out in accordance with a CVCC curve
and is automatically switched back to trickle charging after 8 hours,
for example. As a standard, the characteristic curve values
correspond to the charge values. The charging voltage can be
adjusted separately.
Start-up charging:
Start-up charging is carried out in accordance with a CVCC curve and
is automatically switched back to trickle charging after 8 hours, for
example. Charging current and charging voltage can be adjusted
separately from the other characteristic curves.