SENS MicroGenius S2/S4 Technical Manual
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8.4.20.
Load Share Fail
Indicates that chargers connected for load sharing are not sharing the current load. Activates
double flashing yellow DC LED. Alarm/communications circuit board LOAD SHARE FAIL relay
contacts change to Fail state after delay when alarm is assigned to relay contacts.
8.4.21.
AutoBoost Lockout Active
Indicates the Boost mode time limit has expired and charger has returned to Float mode. Boost
mode is disabled until the time limit is reset. The Boost time limit is reset if charger power is
cycled or an engine crank is detected. The Boost time limit is set to 24 hours by default.
8.4.22.
DC Negative Open
Indicates an open DC negative output connection when chargers are load sharing. Tighten or
make connection to remove alarm. Activates double flashing red DC LED. Alarm/communications
circuit board DC NEGATIVE OPEN relay contacts change to Fail state after delay when alarm is
assigned to relay contacts.
8.4.23.
Address Fault
Indicates an address fault when more than the maximum number of chargers is connected to load
share. Activates double flashing red DC LED. Alarm is not displayed on the LCD and cannot be
assigned to relay contacts.
8.4.24.
Charger Module Fault
Indicates one or more individual charger module(s) internal to the charger are in an alarm state.
Activates flashing green/red DC LED. Alarm/communications circuit board INDIVIDUAL CHARGER
relay contacts change to Fail state after delay when alarm is assigned to relay contacts.
9
OPERATION
9.1.
Charging Algorithms
The charger uses charging algorithms appropriate for different battery types. The charging algorithm for
each battery type includes various combinations of Float mode, Dynamic Boost™ mode, and HELIX mode,
as described in Table 17. See following sections for descriptions of each charging mode.
Table 17 – Charging Algorithms
Battery Type
Charging Algorithm
Float
Mode
Dynamic
Boost Mode
HELIX
Mode
FLA for Genset
FLA
AGM
NCD
VRLA
9.1.1.
Recharging Batteries
After a battery has been discharged, the charger will enter Dynamic Boost mode if this mode is
enabled (see section
9.3
). The charger’s output voltage setpoint during Dynamic Boost mode
increases to the boost voltage value (see section
9.3
). If the battery is deeply discharged, DC
voltage will remain below the boost voltage setpoint until the charger’s output current drops
below its rated maximum. Charging in the boost mode continues until the Dynamic Boost control
system ends the boost mode or the boost time limit expires (boost time limit set to 24 hours by
default). After operating in boost mode the charger switches to Float mode (see section
9.2
). If
the charger is configured for flooded lead-acid batteries the charger will engage HELIX mode after
operating in Float for a short time.
