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2. AIR OPERATION – FIXED OR ROTARY WING AIRCRAFT
The aircraft industry is constantly making technical advancements in the areas of composite material construction and weight
reduction of installed equipment. Unfortunately, this can conflict with the safe operation of some electronic medical
equipment. Composite materials do not work well as a grounding agent for electronic equipment. The weight reduction
techniques used in AC inverters often create unsafe conditions when operating electronic medical equipment.
The Crossvent is designed to operate from an external power source delivering 12 to 28 volts DC at a continuous current of
2.5 amps.
It is best to operate the Crossvent from the aircraft’s 24-volt DC battery source, rather than an AC inverter. To insure the
best “grounding” between the Crossvent and the aircraft metal frame, connect the Crossvent directly to the 24-volt DC
power bus through appropriate fusing. This will keep extraneous interference and current leakage to a minimum.
3. INVERTER OPERATION
If it is necessary to operate the Crossvent from an AC inverter, similar to KGS Electronics brands, only those inverters in
compliance with NEMA standards should be used. Inverters with “split winding” output transformers should not be used
with the Crossvent and supplied charger.
The inverter output must be configured like standard household or industrial wiring, where the black wire is “hot”, the white
wire is “neutral”, and the green wire is “ground”. The neutral and ground wires should be connected together at one point
of the frame so that there is no voltage between them, and there should be 115 volts AC between the hot and neutral wires.
The inverter receptacles must be of the standard three-prong configuration to utilize the hospital-grade cord of the Bio-Med
supplied charger. This will keep voltage surges, spurious noise and leakages to a minimum.
Any other type of AC/DC power supply or charger, such as open frame devices, medically approved or not, is not
recommended by Bio-Med Devices.