Cardinal Floor Hugger, Owner'S Manual

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4
CALIBRATION PROCEDURE Continued
Place test weight equal to ten percent of the scales capacity over each of the four load cells, one at
a time. Record each displayed weight. If difference in displayed weight exceeds ±.05 percent of
the test weight, trimming adjustments for your load cells must be performed. Refer to TRIM
ADJUSTMENT Section for further instruction. If all four weight readings are within the allowable
tolerance (±.05 percent of test weight), weight indicator should be re-calibrated in accordance with
the indicator manual.
TRIM ADJUSTMENT
The purpose of adjusting trim is so the same weight reading will be displayed regardless of where
the load is placed on the scale deck. All scales are corner trimmed before leaving the factory. In
the event of re-calibration or load cell replacement, follow instructions below to re-trim corners. It is
assumed the other three load cells are already corner sealed to agree with each other. If not,
please refer to next page for further instruction.
1. Remove access plate located on scale deck.
2. Remove junction box access cover.
3. Refer to Figure No. 3 for load cell location reference.
4. Turn trim potentiometer for the load cell needing re-
calibration clockwise 25 turns, or until a click is heard
indicating the end of the potentiometer adjustment.
5. Place a test weight on each corner, one at a time,
and record the displayed weight for each corner.
6. Place test weight on the corner with the highest
reading and adjust the appropriate trim
potentiometer until the weight reading agrees with
the lowest reading obtained in Step 5.
7. Repeat Step 6 until all corners have the same weight
reading.
8. Replace screws securing the junction box cover and
access plate.
Figure No. 3
If two or more load cells must be replaced or scale needs an over-all resealing of each corner,
these procedures should be followed.
1. Remove access plate located on scale deck. Remove junction box access cover.
2. Turn all potentiometers clockwise 25 turns or until a click is heard. Now turn all potentiometers
counterclockwise 1 (one) turn.
3. Place test weight of at least 10 percent of scales capacity on each corner, one at a time, and
record each displayed weight.
4. Place test weight on corner with the highest displayed weight and adjust appropriate trim
potentiometer counter-clockwise until corner reading agrees with lowest weight reading.
5. Repeat Step No. 4 until all corners are equal.
6. Re-calibrate weight indicator following procedures in indicator manual.
7. Replace screws securing the junction box cover and access plate.
EXAMPLE:
CORNER NO.
1000 lb TEST WEIGHT 1 2 3 4
DISPLAYED WEIGHT READING 1020 1016 1017 1021
1. Place test weight on each corner, one at a time, and record each displayed weight.
2. Place test weight on corner no. 1 and adjust no. 1 trim potentiometer to reduce displayed
weight to the lowest corner reading (No. 2 in example).
3. Repeat step 2 with corners no. 3 and 4 until all corners are in agreement.
4. Calibrate weight indicator following instructions provided in its manual.