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Magtrol Hysteresis Dynamometers
8.1.4
M
eCHaniCal
Refer to the drawing and the instructions below if the dynamometer will apply torque but the torque
reading will not calibrate full scale, even though the zero balance is within tolerance. See Figure
5–1 Mechanical Layout of a Load Cell.
1. Disconnect all inputs and outputs on the dynamometer rear panel.
2. Disconnect the dynamometer line cord from the line power source if applicable.
3. Carefully remove the rear panel.
Note:
4. Remove the socket-head cap screw retaining the pulse disk to the shaft.
5. Remove the pulse disk.
6. Loosen, but do not remove, the load cell clamping screw.
7. Carefully grasp the brake assembly and slowly rotate the assembly in both directions. Please
note several degrees of free-swing, restrained by the damper cylinder in both directions.
Note:
The objective is to reposition the load cell in such a manner to re-establish the center of
allowable rotation, restricted by the damper assembly. Devise a shim of sufficient thickness,
that when inserted between the top of the damper cylinder and the damper arm, the arm will
be parallel to the top of the cylinder.
The above diagram shows the location of these elements, however, you will only be able to
view them from the top.
8. While pressing down on the damper arm, thus positioning the entire assembly, tighten the
load cell clamping screw. Be sure the load cell assembly has not moved axially and is seated
against the sleeve resting up against the inner race of the carrier bearing.
9. Remove the shim.
10. Reinstall the pulse disk, reassemble the enclosure and then recalibrate.
(r
) a
oTaTional
lignMenT
It is a good idea to clamp the rear panel to the dynamometer base
plate.
Do not force this assembly!
MAINTAIN PARALLEL
DAMPER
CYLINDER
Figure 8–1 Damper Connection
DAMPER ARM
BRAKE
63
Chapter 8 – Troubleshooting
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