The information in this article applies to:
CWB-1762, NORTRON-7410

PROBLEM

How do you calibrate this unit?

RESOLUTION

Calibration:

Tools Required: 3.5 Oz weight, small standard screwdriver, 1/2" wrench.

General

Perform Steps in the order listed and as specified. DO NOT skip steps. DO NOT disassemble unit until Functional Check has isolated the problem.

When a Electrical malfunction is indicated: Check all inter-connecting wiring and connectors.

When a Mechanical malfunction is indicated: Check all fittings and fasteners.

Caution: Do not adjust or replace any part of the balancer before performing the Functional Check procedure. The Functional Check procedure will isolate the adjustment or replacement necessary.

Caution: If a discrepancy is found in the building wiring, have the owner call a licensed electrician.

Calibration Procedure (Transducer Equalization)

Note: After completing this procedure, the Rim Distance Gauge may not line up with "C" when the bolt is flush with the face plate. However; the balancer will be calibrated correctly and be able to balance in a single spin.

1. Enter the tire parameters in the normal manner: Rim Distance, Rim Width, Rim Diameter. Be sure the Rim Distance measurements are taken from the lip of the rim.
2. Fine balance (0.0) an F78-14 tire by holding the START key down.
3. Add a 3.5-ounce weight on the outer rim at position 0 on the outer display.
4. Press keys on the keypad in the following sequence:

   E,Start,3,5,Start

   The outer display will show E35. The inner display will be blank. The wheel will spin longer than normal (about 18 seconds).

5. When the wheel stops spinning, the inner and outer displays should read 3.5 +/- .02 oz. If not, adjust the inner and outer equalization pots to 3.5 +/- .01 oz. The pots are located on the Display Boards and are accessible by removing the weight tray.
6. Repeat step 4 to verify repeatability of the adjustment.
7. Remove the weight and check the fine balance. Add the 3.5 ounce weight to the inner rim at postion 0.
8. Press the start key for a normal spin to check the accuracy of the inner weight reading. The inner weight reading should be 3.5 +/- .02 oz. If within tolerance, skip to step 10. If not, Go on to step 9.
9. If the reading in step 8 is out of tolerance (3.5 +/- .02 oz) you MUST correct it by entering a different value for the rim distance parameter.

   For Example: If the weight reading in step 8 was 3.2 the rim distance parameter that was entered was 5.5, Re-enter a rim distance that is higher. In this case try 5.8.

   Likewise, if the weight reading in step 8 was too high, enter a rim distance parameter that is lower than the one that was already entered.

   Generally, every tenth of an ounce of weight is corrected by a tenth change on the rim distance parameter.

   Very Important: Return to step 2 and repeat the entire procedure. Continue running the entire procedure, Steps 2 through Step 8, until the inner and outer readings in Step 8 are within tolerance. DO NOT proceed to Step 10 until Step 8 is within tolerance.

10. If the inner weight reading in Step 8 is within tolerance, check the value entered for the Rim Distance. Be sure this value agrees with the distance gauge. If is does Calibration Is Complete. If it does not, loosen the lock nut and adjust the bolt to obtain the reading that was entered for Rim Distance.

Calibration Complete

REFERENCES

Keywords: Calibration,
General Category: Application
Specific Category: Calibration

Rel Yes: 35

Rel No: 1

Last Update:
4/5/2002

Total Views:
6082

Provided by Snap-on Equipment National Technical Support

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