31
Systems
POSSIBLE PROBLEMS/SOLUTIONS (DVSR)
1. Red LED light not visible at DVSR-
One cause could be the remote battery
switch is not energized.
2. Red LED light stays on after the
engine is turned off- This is a normal
condition. The residual battery voltage because of bat-
tery charging has not yet dropped below 12.8 volts for the
DVSR to cut out.
DVSR (DIGITAL VOLTAGE SENSITIVE
RELAY)
Located on the
battery manage-
ment panel are 2
DVSR’s (digital
voltage sensitive
relays).
T he p ur po s e
of the DVSR is
to protect the
engine batteries
from being dis-
charged. Also,
when the engine
batteries are fully
charged it sends current to charge the house battery.
When the cranking battery(ies) DC voltage rises above
13.4 the DVSR switches to charge (cranking and house)
both batteries in parallel simultaneously. When the battery
voltage drops to 12.8 volts DC the DVSR disengages.
This DVSR capability is referred to as “dual sense”. This
permits the DVSR to sense the voltage of both batteries
that it is connected between. If one of the batteries is
receiving a charge the DVSR will close by paralleling both
battery banks to charge the house battery along with the
2 engine cranking batteries.
Notice the illustration shows a LED light which indicates
when lite that the DVSR is closed and is sending a charg-
ing current to a battery(ies).
If the DVCR senses the engine batteries are being dis-
charged at a fast rate it will open and will not allow those
batteries to be overly discharged to the point that the
engines will not crank over.
An example of the above situation would be if the vessel
was stationary at sea for an extended period with various
electronic and entertainment equipment energized along
with the engines and
generator off the batteries would
normally discharge.
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