Merlin Equipment: PowerGuard Lite manual V2.2 10/15
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2.
Package Contents
19-4015 Merlin PowerGuard Lite
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12V & 19-4016 Merlin PowerGuard Lite
–
24V:
Merlin PowerGuard Lite Central Processing Unit (CPU)
Reset Switch with integrated warning LED
Battery Disconnect Contactor with bracket
19-4017 Merlin PowerGuard Lite
–
OEM Version (CPU Only):
Merlin PowerGuard Lite Central Processing Unit
3.
Operation
The PowerGuard Lite is a flat battery protection device. When the battery voltage reaches a
preset voltage, the LED within the reset switch will flash to warn that batteries are low. When
the voltage has been at the preset level for longer than the preset time, the contactor will
disconnect the battery from the loads. At the same time, the LED within the reset switch will
stay on continuously.
To reconnect power, press the reset switch. We highly recommend that the engine is started or
that an alternative charging source is connected immediately.
Note: If the reset switch is pressed after disconnection and a charge source is not connected, the
timer will start again and disconnect the batteries.
CAUTION: Continual pressing of the rest switch without attaching a charging source will
eventually cause excessive discharge to the battery.
4.
Inhibit Function
PowerGuard Lite is fitted with an Inhibit Function. When there is +12V/24V on this wire, the
PowerGuard Lite will not disconnect the batteries regardless of battery condition. We normally
recommend the Inhibit wire to be connected to the engine ignition switch.
CAUTION: Not fitting the inhibit wire to the ignition or other circuit that becomes live when
the engine is running could cause damage to the engine alternator, ECU or other components
if the battery is disconnected while the engine is running.
