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5. Short circuit protection
The GPU has integrated short circuit protection for avoiding the regulator damage in case of a short circuit.
In case multiple loads are used on the same voltage line it is highly recommended to use fuses- this will allow the GPU to
operate in the event of load short circuit. Please see Figure 9 for a diagram of fuse installation.
As an example, fuses can be installed before the payload, rf-transmitters as well as before the individual servos. If, for
instance, there is a short-circuit in the payload - unmanned aircraft can still perform a safe landing.
Figure 9 Installation of the fuse before each load will allow the GPU to supply power in case of the load short-circuit
6. Battery backup
External battery provides power supply to the system in case the input voltage drops below the battery voltage. This
may occur because of several reasons:
a) During engine idle, when generator provides insufficient voltage at the given load
b) During pre-flight preparation when the engine is not operating and the external power supply is not
connected
c) During mechanical generator failure
d) During engine failure
The following formula should be used to calculate approximate battery capacity for a particular UAV configuration:
Battery capacity (Ah) = operation time (h) average load power (W) / battery voltage (V) / 0.8
Where operation time is desired operation time, battery voltage is 11.1 V and 0.8 is regulator typical efficiency.
UAV Factory USA LLC.
50 South Buckhout Street,
Irvington, NY 10533 USA
Phone: +1 (914) 591 3070
Fax: +1 (914) 591 3715
Email:
josephm@uavfactory.com
Fuse
Load 1
Fuse
Load 2
Fuse
Load 3
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24A-52 Ganibu Dambis,
LV1005, Latvia
Phone: +371 29119398
Fax: +371 63048747
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