Merlin POWERGUARD PRO User's Installation Manual page 14

Flat Battery Protection System
PC Interface Battery 1 Battery 2
Volts Volts
L H L H 0
The left-hand trim pot adjusts the disconnection voltage threshold for battery 1, the middle trim
pot adjusts the disconnection voltage threshold for battery 2, the right-hand trim pot adjusts
the time delay between zero and 240 seconds.
Note that potentiometer settings are almost perfectly linear.
For example, with the control in the 12 o'clock position, this would be in the middle of the
adjustment range. e.g. 11.6 Vdc for disconnection voltage, 120 seconds for time delay.
The flat battery protection setting is the threshold at which the PowerGuard Pro will disconnect
the battery once the disconnect voltage has been reached and the time delay has elapsed.
Please note that the battery voltage must remain below this threshold for the entire time delay
period.
As a rough guide we would recommend the following settings:
• 12V Engine Start Battery:
• 24V Engine Start Battery:
• 12V Auxiliary Battery:
• 24V Auxiliary Battery:
Actual settings will be dependent upon battery type, battery capacity and installation
conditions. Some experience and practice may be required to get the settings perfect for your
installation, however, Merlin and its Dealers will be happy to provide advice if required.
REF: QSF-030
Issue: D
Time
Delay
L
Time
Delay
B2 Disconnect
Voltage
B1 Disconnect
Voltage
Merlin Equipment Ltd
PowerGuard Pro – User and Installation Guide
12.1V DC 2-minute timer
24.2V DC 2-minute timer
11.6V DC 4-minute timer
23.2V DC 4-minute timer
Page: 14 of 18