Vyaire VELA, Руководство по обслуживанию

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Chapter 9: Frequently Asked Questions
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Chapter 9: Frequently Asked Questions
Q.
How do I check the battery charging circuit?
A.
Access the
SVT mode. Access “Transducer Data”. Choose “Analog X” any one showing will do. Rotate
the control knob until IB (Internal Battery) is selected press accept. Exit screens and return to the wave
form screen. In the area just above one of the wave forms that shows what the wave form represents
you can touch this and a menu window will appear rotate the control knob until the “Analog X” that you
set IB in is selected then press accept. The wave form will now represent a battery capacity. You can
see this voltage by pressing the freeze button and the voltage value will appear next to the curser line,
with a green status light this voltage should read above 80% of full charge. The charge scale is 1.0 to
4.0, 1.0 being 0 charge and 4.0 being Fully charged. The formula to find the percent of charge for the
VELA internal batteries is:
(( # - 1.0)

3) x 100 = % of charge
Example:
3.4 -1.0 = 2.4

3 = 0.8 x 100 = 80 % of full charge capacity
Another way to see if the battery charge is working would be to connect to the internal battery Molex
connecter on the red and black leads using the voltage meters probes enter the back of the connecter
on these leads and with the unit connected to AC you should see a slight increase of voltage taking
place over time. If you disconnect the AC plug while unit is running on a test lung you will see the
battery voltage maintain a very stable reading.
Q.
How do I determine if the batteries are good?
A.
Refer to the
“Battery Performance Test” in chapter 7. Using the same set-up as mentioned above, with
voltage meter probes connected to the back of the Molex connecter and ventilator connected to and
running with a test lung connected. Check the battery voltage during step #7
. The voltage should
decrease very slowly during this test. If you detect a very rapid discharge occurring and the batteries
are very hot to the touch the batteries have lost their capacity and should be replaced.
Q.
How often do I need to change the batteries?
A.
The Nickel Metal Hydride batteries have a life expectancy of 300 to 500 full discharges, however this is
a difficult life expectancy to quantify in an amount of time as few customers will often discharge the
batteries fully. The life of a battery will depend largely on the exercise of the batteries regularly. It is a
good practice to run the ventilator on battery power for 2-4 hours on a regular interval to ensure
discharge and recharge. This could be done once or twice a month, if vent is in constant use. The
battery care is a very important aspect of preventative maintenance. It is however, recommended that
the batteries be replaced every two years.
Q.
How do I know the Monitored Volumes are good or bad?
A.
Because the monitored values are calculations based on the Delivered volumes you must first
determine if the delivered volumes of the ventilator are accurate before you can know if the monitored
values are inaccurate. Follow the “Delivered Volume Test” in chapter 7. This will tell you if the delivered
volumes are accurate.
If the delivered volumes are good, follow the “Monitored Volume Test” in chapter
7 to determine accuracy of the monitored values.