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BVSMP/LT Issue 3 ECR 2544
Battery Resistance Monitoring
The Battery Resistance Monitoring function ensures the battery condition is continuously
monitored, and is a more accurate method than simple voltage measurement.
The BVSMP monitoring meets the requirements of BS EN54-4.
Monitoring is controlled by a 2way DIL switch located behind the front panel.
Note: To ensure compatibility with previous versions of BVSMP the Resistance Monitoring
can be disabled (see “Compatibility Mode” instructions below).
The BVSMP has a factory preset default threshold of 0.1
Ω
for the overall resistance of the
cables and batteries. If the BVSMP detects a reading above this threshold then a fault will be
announced.
Depending on the cables and batteries in use it may be necessary to adjust this threshold to
ensure correct fault detection.
BVSMP “Diagnostic Mode”
Press and hold the front panel “Lamp Test / Fault Accept” button for 10 seconds.
The unit will then enter a “Diagnostic Mode” and the Front Panel LEDs will display the
Resistance Value the BVSMP has detected.
This is shown in the following figure:
Set the front panel DIL SW to match the detected resistance.
To leave “Diagnostic” mode and return the BVSMP to normal operation press the
“Lamp Test / Fault Accept” for 10 seconds.
Compatibility Mode (Both DIL SW “ON”)
The resistance monitoring function must be disabled if the BVSMP is being retro-fitted to a
system with other non-resistance monitoring BVSMP units.
Set both DIL SW to “ON” to disable resistance monitoring.
In “Compatibility Mode” the battery monitoring detects and displays “Battery Low Voltage”
faults.
