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2-47

Running on Machine Room Inspection

iControl AC

Calibrating Actual Car Speed

If iLand and iLink are already installed, use the landing system speed (Speed/Actual on the

Operational Status tab) as the speed reference for calibration. If not, use a hand-held tachome-

ter to obtain the value.

If you are using a hand-held tachometer, hold it against the hoist or governor rope on the

machine. The car must run at the commanded inspection speed in both directions (see Cau-

tion). If measured inspection speed does not match the commanded value, verify the following:

1. Verify the Inspection - High Speed parameter (iView: Configuration > Pattern > Modes

tab or iBox: Car/Pattern Profile/Inspection high velocity).

2. Verify that Pattern scaling is set to 100% (Configuration > Pattern > Common tab).

3. Verify drive parameters set earlier:

• TORQMAX F5: see “Initial Drive Settings (TORQMAX F5)” on page 2-26.

•Magnetek: see “Initial Drive Settings, HPV 900 S2” on page 2-31.

4. Additional drive specific instruction:

• Magnetek: Adjust drive parameter A1 Contract Mtr Spd if the speed is not correct

(higher RPM for increased speed.

• TORQMAX F5: Adjust motor parameter LN02 Gear Reduction Ratio, on the Home >

Prog > Machine Data menu, in small increments to obtain the correct Inspection

speed (see Note) (LF.22).

Note

Gear Reduction Ratio: If the gear reduction ratio is not available from the machine name plate, calculate

the value by first measuring the motor revolutions using a marker on the motor shaft or brake drum.

Reduce the inspection speed by decreasing the Inspection High speed setting, then determine the num-

ber of motor shaft revolutions required to complete one revolution of the sheave. Calculate the gear

reduction ratio using the formula: Gear reduction ratio = Motor RPM / Sheave RPM. Enter the calculated

value in parameter LN02 (LF.22).

The drive has the capability of estimating the gear reduction ratio. Run the car on inspection and read the

value of parameter LN05 (LF.25), the gear ratio estimated by the drive. The value of LN05 (LF.25) can be

temporarily used for LN02 (LF.22).

Caution

Up vs. down speed variance: If the car runs at commanded speed in one direction but less then

commanded speed in the other direction, this can indicate insufficient voltage available to generate

the required torque. At inspection speed this may be as little as 1 or 2 fpm, but at contract speed this

variance will be much greater. On a small percentage of jobs it is necessary to increase the value of

TORQMAX F5 parameter LM05 Motor Voltage on the Home > Prog > Machine Data menu (LF.14).

For example, for a motor rated for 480 volts it may be necessary to increase LM05 to 500 volts.

Motion Control Engineering Nidec iControl User Manual

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