Regal 53 SC Owner's Manual page 82

DVSR (DIGITAL VOLTAGE SENSITIVE
RELAY)
Located on the battery management panel next to the
universal battery switches are 2 DVSR's (digital voltage
sensitive relays).
The purpose of the DVSR is to protect the engine batteries
from being discharged. Also, when the engine batteries are
fully charged it sends current to charge the house battery.
When the cranking battery(ies) rise above 13.7 volts DC
the DVSR switches to charge (cranking and house) both
batteries in parallel simultaneously. When the battery volt-
age drops to 12.8 volts DC the DVSR's open and both
batteries become isolated from each other.
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 battery.
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.
Note in the troubleshooting chapter there is a
page devoted to the DVSR testing procedure.
POSSIBLE PROBLEMS/SOLUTIONS (VSR)
1. Red LED light not visible at DVSR-
A. One cause could be the system voltage
not high enough to activate the DVSR.
B. Check for a faulty ground.
C. Defective DVSR.
2. Red LED light stays on after the engine is turned
off- This is a normal condition. The residual battery
voltage because of battery charging has not yet dropped
below 12.8 volts for the DVSR to cut out.
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Chapter 4