Service manual

Course # 1 Manual
Rev. 1/02 page # 10
Service & Parts Education
CALIBRATING THE BATTERY DISCHARGE INDICATOR MKIV
(MKIV RX, A, PSF, PSR, A+, & REMOTE DISPLAYS)
BATTERY DISCHARGE INDICATOR
The BDI is the fuel gauge for a power wheelchair. The
BDI measures the battery voltage, and will show the
status of the voltage on the BDI Display. Calibration of the
BDI is done at the factory, but can be checked and
recalibrated in the field. It is a good rule of thumb to
check this calibration when replacing a joystick or control-
ler on a chair, or during routine service.
BATTERY LEVEL CALIBRATION PROCEDURE:
STEP 1: Measure the static battery voltage with a digital
multimeter and record this number. The battery voltage
must be in the range of 22.9 - 25.6 VDC, in order to
proceed. If battery voltage is too low, recharge batteries
overnight.
STEP 2: Verify the segment position of the BDI, and use
the chart below to see if calibration is necessary. Your
static battery voltage reading should match the segment
position of the BDI. If it does match the range then no
calibration is necessary, if it is NOT in the range then
proceed to Step 3.
Battery Voltage Segment Position
22.9 - 23.2 Volts 3
23.3 - 23.6 Volts 4
23.7 - 23.9 Volts 5
24.0 - 24.2 Volts 6
24.3 - 24.5 Volts 7
24.6 - 24.7 Volts 8
24.8 - 25.0 Volts 9
25.1 - 25.6 Volts & Up 10
STEP 3: Disengage the motors and turn the power on.
Plug in your MKIV Remote Programmer into the 5 Pin
connector on the chairs controller. Turn on your program-
mer and select the CALIBRATION MENU, arrow down
until you see the BATTERY LEVEL menu option and
select it. Observe the position of the right most lighted
segment (bar) on the BDI display counting from the left.
The LCD and LED display 10 segments. Using the chart
above and the UP & DOWN arrow keys on your program-
mer, recalibrate the BDI Display and save your changes.
Turn the chair off then back on to verify calibration.
LED BDI DISPLAY
EF
I II I
I II I
I I
II
II
I
LCD BDI DISPLAY
EF
Use your digital multimeter to
verify the static voltage. Take your
reading from pin numbers 1 & 2 in
the charger port.
Don’t forget to SAVE your changes
when you are done, also remem-
ber that you only need to save the
changes to one drive (calibrations
are global with MKIV Electronics).
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