KEB COMBIVERT F5 Reference Manual page 303

Item #
Verify correct Machine Data
(LN) parameter settings.
Encoder/Motor Pole Position
Incorrect
Motor Data Incorrect
Diagnostics and Troubleshooting
Check/Solution
The Machine Data parameters are used as a scalar to translate the
command speeds programmed in FPM to an rpm value used by the
drive. Incorrect setting of the machine data parameters may cause the
command speed in rpm to be too high or too low.
For example, if a machine has a 1:1 roping ratio, then setting this
value in the drive as 2 (:1) will cause the speeds to be calculated
as twice as fast.
If the Motor (Encoder) Speed matches the Command Speed (rpm),
but the calculated Elevator Speed or the actual speed measured
by hand tach (FPM) are slightly off, then the Machine Data can be
adjusted slightly so the numbers agree. This would typically be
done by adjusting the Gear Reduction Ratio (LN02) or the Traction
Sheave Diameter (LN01).
Refer to Determine the Correct Motor Speed in RPM for further details.
For PM motors, the absolute encoder position is used to properly
indicate the position of the rotor. If the connection of the encoder
to the motor shaft changes (removed/replaced, slippage, etc.), the
absolute encoder position relative to the motor poles is no longer valid
and will require the position to be relearned. If the LE06 Encoder
Pole Position has changed by more than 2,000 from the previous
value, this indicates a change in physical position relation of the
encoder to the rotor, generally due to encoder slippage over time
(potentially distance or change in direction as well), mounting
issues, or mechanical aspects.
When the encoder/motor pole position is incorrect, the motor will tend to
draw high current, hitting the LC30 Maximum Torque setting or Inverter
Peak Current Limit, and tending to stall or only move in the direction
of weighting.
Check the motor data against the nameplate values and perform a
LL01 Motor Tune if not previously completed.
For PM motors, ensure the relationship between the motor rated speed,
motor rated frequency and number for motor poles is correct in case of
any nameplate rounding. Refer to the LM02 Motor Speed for further
details.
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