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SCALE SYSTEM DIAGNOSTICS AND CALIBRATION (STANDARD BED) (CONTINUED)
4. Press and release the position button that corresponds with the load cell to be checked. The LCD 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 resistance of 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.
Verifying Scale Accuracy:
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 ±1% of the actual weight.
2. If the displayed weight is not accurate, remove the weight from the bed and proceed to the Scale Calibration
section.
Scale Calibration:
Note
It requires two people to enable the calibration mode for the scale system. Raise the siderails when calibrating the
scale to avoid getting inaccurate scale readings due to possible interference between the siderails and the casters.
Calibrate the scale system with a known 50 pound weight. If exactly 50 pounds is not available, the factory default for
calibration will have to be changed as described in step 6.
1. To enter the calibration mode, unplug the bed’s power cord from the wall socket.
2. Press and hold down the LBS/KGS button.
3. While still holding the LBS/KGS button, plug the bed’s power cord into the wall socket.
4. After two seconds, release the LBS/KGS button. The LCD should read “Angle Calibrate”. The calibration mode is
now active.
5. Press and hold the Enter button (LBS/KGS). Zero the bed, following the displayed instructions. When the bed is
zeroed, the LCD should display “REF X100=<0>5000”. This is the factory default for 50 pounds. If 50 pounds will
be used to calibrate the scale, proceed to step 7.
6. If exactly 50 pounds is not available, change the display to match the weight you are using. Pressing the Change
Equip. button will move the cursor position to the right. Pressing the up arrow (Zero) button will increase the
numbers. Pressing the down arrow (Scale On/Off) button will decrease the numbers. Scroll through the numbers
until they match the weight you will use for calibration.
7. Place the 50 pound calibrated weight in the center of the bed. Press and release the Enter button and the LCD
will display “Press Rev. Trend”. Press and hold the button with the Reverse Trendelenburg symbol (feet down/
head up) until the bed stops. Release the button and the LCD will display “Do Not Touch Bed”. Press and hold
the Reverse Trendelenburg button again until the bed stops. Release the button and the LCD will display “Do Not
Touch Bed”.
8. The LCD will display “Press Trend.” Press and hold the button with the Trendelenburg symbol (feet up/head down)
until the bed stops. Release the button and the LCD will display “Do Not Touch Bed”. Press and hold the Trend
button again until the bed stops. Release the button and the LCD will display “Do Not Touch Bed”.
9. Repeat steps 5 - 8 with 200 pounds.
10. The LCD will display the weight. This indicates the calibration procedure is complete.
11. Level the bed at a full up or full down position. Remove the weight and zero the bed.
12. Verify scale accuracy and functionality before returning the bed to service.
Service Information
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