BIO-MED DEVICES CROSSVENT-3+ Operation & Service Manual page 95

APPENDIX F
CHARGERS AND INVERTERS CHARGERS AND INVERTERS CHARGERS AND INVERTERS CHARGERS AND INVERTERS
This explains some of the requirements for connecting a Bio-Med Devices Crossvent ventilator to a charger
or AC adapter. It is important that the correct charger be used and if a Crossvent is to be used in a vehicle
with an AC generating device (inverter), it must comply with certain requirements.
1. LAND OPERATION
When using an AC adaptor to either run the Crossvent or to charge the batteries, only the Jerome Industries
model WSZ116M (16VDC 3A) charger supplied by Bio-Med Devices should be used.
The Bio-Med charger has been thoroughly tested for proper operation with the Crossvent to make sure that
all standards are met. This includes all of the applicable standards for safety, EMI/RFI, power surges, and
leakage. It is approved for medical applications and conforms to FDA, CE, UL, and other required
standards.
Although other forms and brands of chargers may operate the Crossvent, there is no guarantee of system
reliability or conformance to required standards.
Should an emergency arise and it becomes necessary to operate the Crossvent without the Bio-Med charger,
use only a charger that is approved for medical use and complies with all applicable standards. It must
produce filtered DC voltage ranging between 12 and 28 volts DC and be rated for continuous 2.5 amps of
current.
Should a Crossvent fail to operate or charge from a charger, both the Crossvent and the charger should be
returned together to Bio-Med Devices for evaluation.
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.
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