Powerguard Pro Operation; After Installation - Merlin POWERGUARD PRO User's Installation Manual

• Vehicle type.
• Vehicle alternator rating (Amps).
• Auxiliary battery size (Ah) & type (e.g. Lead Acid / AGM).
•
Maximum auxiliary battery bank loads.
• Battery split charge connect / disconnect voltages.
• System switch inputs required.
Please ensure all programming requirements and parameters and any customer training needs
are addressed by your specifying engineer before taking delivery of the unit.

POWERGUARD PRO OPERATION

PowerGuard Pro has been developed as a remote battery switching & flat battery protection
system.
During normal operation the
auxiliary batteries. Depending on these voltages it will carry out the following tasks:
1. Flat battery isolation (PowerGuard)
Should the engine battery discharge to below the pre-set voltage threshold (set via the B1 trim
pot) a timer will activate. If the voltage remains below this threshold for the pre-set timer
period (set via the Timer trim pot), the engine contactor will isolate. The red LED in switch 1 will
also illuminate.
Should the auxiliary battery discharge to below the pre-set voltage threshold (set via the B2
trim pot) a timer will activate. If the voltage remains below this threshold for the pre-set timer
period, the auxiliary contactor will isolate. The red LED in switch 1 will also illuminate.
To reset the flat battery protection on either battery bank, press switch 1. The relevant
contactor will reconnect. At this point charge should be applied to the batteries by either
starting the engine or use of an external charge source.
2. Battery Isolators
Using switches 2 and 3 enables user control of the manual battery isolators. This facility
negates the need for additional battery isolation devices within the system. The switch LEDs
provide user feedback as to whether the battery is manually connected or disconnected.

AFTER INSTALLATION

After installation and set-up, the blanking plugs (provided) should be fitted into the holes in the
front of the unit. Note that they are designed to be difficult to remove so make sure you are
finished before inserting them! The rubber blanking plugs restrict ingress of moisture and dirt
into the ECU.
If you are unsure about any aspect please consult a suitably qualified engineer, your Dealer or
Merlin Equipment Ltd before commissioning the unit.
REF: QSF-030
Issue: D
PowerGuard will monitor the voltages of both the engine and
Merlin Equipment Ltd
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