Precor AMT12 base, Руководство по обслуживанию

Страница: 44 / 276

© Precor Incorporated, Unauthorized Reproduction and Distribution Prohibited by Law Page 44
This error code monitors the physical lift position via a lift position potentiometer that mechanically tracks
the lift's physical position and sends a DC voltage back to the control system. The voltage is converted
to an 8-bit digital number. This number is then used to represent the lifts physical position. Software sets
upper and lower numerical limits. If the lift position number is found to be outside of the set limits, error 42
will be displayed.
When troubleshooting an error 42 it is important to be aware of the actual physical position of the lift when
the error occurs. If the lift is physically out of range or jammed you must first determine why the lift is
physically out of range. When the lift is out of range the error 42 is a secondary symptom and the problem
should treated as an error 40 instead of an error 42.
The A/D value for the home position (Level-2) is approximately 83.
Possible Cause
1 Bad or intermittent connection in the lift motor connector.
2 The lift motor requires re-calibration. ***If the lift had been calibrated correctly at the time of
installation and working for some period of time it would be highly unlikely (if not
impossible) for it to just go out of calibration on its own. It would be more likely that
something has broken causing the A/D value to be wrong.
3 The lift motor potentiometer is bad.
Possible Remedies
1 Intermittent connections can be difficult to locate. If the error 42 condition is intermittent a
connection is almost certainly the problem. This is especially true if the error 42 occurs while the
lift is within its normal physical range.
Carefully inspect the lift potentiometer connector, repair the poor connection, if possible. If the
intermittent connection cannot be found or repaired, replace the lift motor.
A lift calibration number of 0 or 255 indicates an open or shorted potentiometer connection. This
problem could be anywhere between the lift motor and the upper PCA. It can typically be found and
traced with an ohmmeter.

Remove the lift
motor’s connector from the INCLINE connector on the lower control module.
Visually inspect the lift
motor’s wiring and connector for any broken or improperly crimped
connections. With an ohmmeter, read between the red & black wires, the black & white wires,
and the red & white wires of the lift motor connector. The reading between the red & black
wires should read approximately 1K

(Ohms). The sum of the readings between the black &
white wires and red & white wires should total approximately 1K

(Ohms). If either reading is
significantly high or open, replace the lift motor.
2 Refer to the lift calibration procedure. If the lift position number and physical lift position
measurement does not correspond with the service manual, calibrate the lift motor.