System {14037 - Studer VarioString User Manual

A= equalization voltage, B= absorption voltage, C= floating voltage
8.4.5.7 New cycle {14027}
Usually, batteries are charged during the day via the PV generator then partially discharged during
the night by the user. The next day, a charge cycle starts again (bulk-absorption-floating). To start a
new complete charge cycle the battery should be discharged below the conditions set by the
parameters {14029} to {14034}. If these conditions have not been met because, for example, the
installation has no users, a new absorption phase will not be necessary as this would lead to slight
battery water consumption. In this case, the charge cycle is kept in floating phase.
8.4.5.7.1 Force a new cycle {14028}
This parameter enables to force manually a complete charge cycle. The VarioString switches
immediately to the bulk phase.
8.4.5.7.2 Conditions for a new cycle
A new battery cycle will be triggered if one or the other 2 conditions, defined by a period of time
during which the battery voltage is lower than a threshold, is met. These 2 voltages related to 2
durations are configurable. Usually a higher voltage is used for a longer duration and a lower voltage
for a shorter duration.
Voltage level 1 to start a new cycle {14029} (48.8 Vdc)
Time period under voltage level 1 to start a new cycle {14030} (30 min)
Voltage level 2 to start a new cycle {14031} (47.2 Vdc)
Time period under voltage level 2 to start a new cycle {14032} (2 sec)
8.4.5.7.3 Cycling restricted {14033} (yes)
The repetition of the charge cycles can be limited establishing the minimum time between each
cycle using parameter {14034}.
8.4.5.7.4 Minimal delay between cycles {14034} (1 hour)
Determines the minimum interval (time) between each cycle when parameter {14033} activates this function.
If the parameter {14033} is activated and the interval parameter {14034} is set to 24h, there
will be only one charge cycle per day. In this case, if the conditions are met for a new cycle,
it will not take place until the next day and the charger will keep the battery at floating
voltage.

8.4.6 System {14037}

8.4.6.1 Block manual programming (DIP switch) {14174} (no)
See Basic Settings chap. 8.4.4.1.
8.4.6.2 Type of battery grounding {14040} (no control)
This parameter allows the VarioString to constantly verify the state of the battery grounding
connection, if desired. In the event of an error, the VarioString stops until the battery grounding is re-
established. It is possible to ground either of the battery terminals.
User manual V 1.0
Studer Innotec SA
VarioString
35