Mec Speed Level Series Service & Parts Manual page 73

Secton 6 - Electrcal System
• Check CALIBRATIONS / HEIGHT CALS; the "ElevUp" value shows the recorded height where
the switch opened.
F20:HEIGHT<>0%
F21:HEIGHT<>0%
• This message occurs if the platform height is not 0% after the platform has been fully lowered
at the end of a calibration step. The platform must return to the same height each time it is fully
lowered.
• Check DIAGNOSTICS / SYSTEM to check the height.
F22:HEIGHT<>100%
F23:HEIGHT<>100%
• This message occurs if the platform height is not 100% after the platform has been fully raised
during a calibration step. The platform must return to the same height each time it is fully raised.
Check DIAGNOSTICS / SYSTEM to check the height.
F24:TOO MANY
• This message occurs if too many static measurements are taken during a calibration step.
• In the rare event that this occurs, please call MEC for assistance.
F25:CHECK ELEV
F26:CHECK ELEV
• This message indicates a problem with the elevation switch (P7-5) during the STATIC phases.
• The switch is either staying closed to a higher height, or staying open to a lower height, than that
recorded during the DYNAMIC phase.
F27:BAD HEIGHT
• This message indicates a problem with the height sensor output (P8-2 and P8-6) during the
STATIC calibration phases.
• The height sensor output must be between 1.0V and 4.0V at all times.
• Check DIAGNOSTICS / SENSORS to see the output. A reading of 0V or 5V is probably due to a
wiring problem.
F30:BAD HEIGHTS
• This message indicates that the recorded heights are not increasing during STATIC lift, or are
not decreasing during STATIC lower.
• This problem may be caused by repeatedly opening and closing the UP or DOWN switch during
the STATIC phases.
F31:REJECT CURVE
• The DYNAMIC pressure curve is unacceptable.
• An initial pressure peak when the platform lifted cannot be found between 0% and 15% height.
• Check for proper weight in the platform and check pressure sensor and lift cylinder hydraulics.
F32:REJECT CURVE
• The DYNAMIC pressure curve is unacceptable.
• There should be a lowest pressure about halfway through the lift (i.e.: near 50% height); the
lowest pressure measured is at too low a height.
• Check for proper weight in the platform and check pressure sensor and lift cylinder hydraulics.
Page 66 Speed Level Seres - Servce & Parts Manual
January 2019