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LN - Machine Data Parameters
The following parameters relate to the machine data of the elevator. It
is important to enter the correct values, such that both the motor and
the car run at the correct speed and the drive’s internal Overspeed Er-
ror limit is calculated correctly. The drive uses the following equation
to calculate the motor speed in RPM from the machine data param-
eters.
12 x LN02 Gear Reduction Ratio x LN03 Roping Ratio x FPM Speed
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LN01 Traction Sheave Diameter x 3.141
RPM =
12 x LN02 Gear Reduction Ratio x LN03 Roping Ratio x m/s Speed x 0.00508
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LN01 Traction Sheave Diameter x 3.141
RPM =
The diameter of the sheave in either inches or mm, depending on US02
System Units (ft/min or m/s). Ideally this value would be measured from the
center of the rope.
The gear ratio, X:1. If the gear ratio is unknown, refer to parameter LN05.
Once the car is running on high speed, if the measured speed is slightly
above or below the contract speed, the gear ratio can be changed slightly
to compensate. Higher values in LN02 will increase the car speed, lower
values will decrease the car speed. Make ver
y small changes at first!
For geared machines with an unknown ratio, the LN05 Estimated Gear
Reduction Ratio can be entered in LN02; refer to LN05 for additional
information. The gear ratio can also be determined by counting the
revolutions of the motor during one revolution of the traction sheave.
The roping ratio, X:1.
6.5 LN - Machine Data Parameters
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LN01
Traction Sheave
Diameter
LN02
Gear Reduction Ratio
i
LN03
Roping Ratio