Maintenance Procedures – Litter
87
Displaying Individual Load Cell Outputs:
A defective load cell can be detected by entering diagnostics and displaying individual load cell outputs.
1. Enter the diagnostic mode. The scale monitor will display CALIBRATE when the diagnostic mode is ac-
tive.
2. Press and release LBS/KGS until the scale monitor displays DISPLAY CORNER.
3. Press and release SCALE ON. The scale monitor should display PICK CORNER NOW.
4. Press and release the position key that corresponds with the load cell to be checked. The scale monitor
should display X/X=NNN.N. ”X/X” represents the initials of the selected corner, i.e. H/R will be displayed
for the patient’s head end, right side. ”NNN.N” represents the actual weight load on the load cell.
5. Repeat step four for each corner. Head end weight readings will normally be lower than foot end weights.
Weight readings should be constant. A drifting 000.0 or 999.9 weight, or a reading that does not change
when weight is applied to that corner of the bed indicates a problem with the selected load cell assembly
or load cell cable.
6. When all the load cell outputs have been checked, press and release SCALE ON. To exit diagnostics,
unplug the bed’s power cord from the wall socket.
Scale Calibration
NOTE
It requires two people to enable the calibration mode for the scale system.
1. Zero the empty bed. Place a known weight on the center of the bed; the heavier the better and no less
than 100 pounds. The displayed weight should be within 1% of the actual weight.
2. If the displayed weight is not accurate, use the following procedure to calibrate the scale:
A. Remove the weight from the bed and place the scale CPU in diagnostics mode (see diagnostic mode sec-
tion on previous page).
B. The scale monitor should display CALIBRATE SCALE
C. Press and hold SCALE ON. Zero the bed, following the displayed instructions. When the bed is zeroed,
the scale monitor should display REF X100=<2>000.0
D. The displayed number must now be changed to match the known weight times 100. For example, if you
weighed yourself on a known accurate scale and you weigh 192.4 pounds, you would change the REF
number to equal 19240. Change the REF number using the LBS/KGS key to position the brackets (<>)
around the digit needing to be changed and the ”+” key to scroll through the bracketed digit.
E. After the number is corrected, press and release SCALE ON. The scale should display ADD LBS, HIT
ON.
F. Place the weight used in step one on the center of the bed and press and hold SCALE ON. The scale
monitor should display RELEASE TO CAL.
G. Release SCALE ON. The scale monitor should display DO NOT TOUCH BED. Don’t touch the bed. When
calibration is complete, the scale monitor should display CALIBRATE SCALE.
H. Calibration is now complete, press LBS/KG until EXIT DIAGNOSTICS appears. Press SCALE ON and
the display will read WEIGHING. Re–zero the empty bed. Check the scale accuracy with the weight used
previously.
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