BOSS – Installation, Operation and Maintenance Manual
A l e n c o n S y s t e m s L L C - P a g e
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Communication
The communication with the BOSS is carried out via MODBUS RTU. Please contact Alencon for Modbus
map information.
BOSS Protection
The BOSS’s protection functions are grouped into three classes:
BUS
Battery
Environment
BUS Protection
Protection caused by conditions on any DC-to-DC converter’s unit. The conditions parameters
are configurable and are stored in the nonvolatile microcomputer memory
Under voltage
The input voltage is too low for normal operation. BOSS enters into STANDBY mode.
Current Limit
Current magnitude is requested by the ESS controller. Current limit is set in the
configuration file and overrides the ESS request.
Short Circuit Protection
When in Discharge mode, Rapid shut down of the DC-to-DC converters unit in case of
external short.
Battery Protection
Under voltage
The output voltage is too low for normal operation. This may prevent upstream equipment
to operate below its designed limit. BOSS enters into STANDBY mode
Over current
Current magnitude is requested by the ESS controller. Current limit is set in the
configuration file and overrides the ESS request.
Short Circuit Protection
When in Discharge mode, Rapid shut down of the DC-to-DC converters unit in case of
external short.
Ground Leak Protection
The BOSS monitors leakage to ground and shuts down if excessive ground leakage
current is detected.
The Ground Leak Monitoring built into the BOSS is not a certified feature, therefore it
does not satisfy the GLDI requiremenets of the overall system. The system must have
an external GFDI device such as GARD (Alencon’s Ground Arc Rapid Disconnect) to
