System Tare And Calibration For Weight Measurement; Setting Up U01-29 To Display Actual Weight; Weight Measurement Design Considerations - Magnetek Impulse G+ series 4 Instruction Manual

System Tare and Calibration for Weight Measurement

1. Attach all of the under-hook attachments that are required during normal lifting (chains, slings,
spreader beam, etc.). Remove the load from the bottom block. If there is a spreader beam or
other lifting device that is constantly attached to the bottom block, it may be left in place. If the
lifting device changes, it should be removed for this procedure and the known weight of the lift-
ing device used for each lift should be manually subtracted from weight that is calculated by the
hoist drive.
2. Run the unloaded hoist in the raise direction at the speed that the weight will be calculated at.
The hoist will automatically pause at the speed programmed in parameter C10-05 (6 Hz is the
default) while calculating the weight on the hook. This is the speed the hoist should be run at. An
easy method would be to set the first speed point equal to C10-05 or, if using an analog speed
reference, then program B02-02 (minimum speed) so that it is equal to C10-05.
3. Record the torque reading being displayed by the monitor parameter U01-09 (Torque
Reference). Repeat this step several times and record the average "No Load Torque" in
parameter C10-10 (No Load Torque).
4. Rig the FULL load that the hoist and weight measurement system will be expected to calculate.
If the rigging used for the full load is different than that used in steps 2 and 3, it will need to be
added to the known weight being lifted to obtain an accurate total weight at a later time.
5. Run the loaded hoist in the raise direction at the same speed as step 2.
6. Record the torque reading being displayed by the monitor parameter U01-09 (Torque
Reference). Repeat this step several times and record the average "Full Load Torque" in
parameter C10-09 (Full Load Torque).
7. The monitor parameter U01-29 should now be displaying a value when lifting a full load. This
value is a raw number that could later be converted into a meaningful weight to be displayed on
the keypad. For this procedure, it is not imperative that the number is converted to tons or
pounds. Most importantly, it should read a value of zero or very close to zero when lifting no load
and should be relatively consistent when lifting the same weight repeatedly.

Setting Up U01-29 to Display Actual Weight

1. Enter the weight of the FULL load into C10-04, not including chains, slings or spreader beams.
Enter this number into the right-most four digits of C10-04.
2. Set the desired number of decimal places in the left most digit; see the examples below:

Weight Measurement Design Considerations

1. The drive's weight measurement monitor, U01-29, will display a fixed value after the
measurement occurs. That value will continue to be displayed until the next weight
measurement is taken at the next run.
2. When displaying the drive's weight measurement feedback on an auxiliary display, such as a
radio or PLC interface, the most accurate feedback can be obtained from the drive with the use
of the drive's RS-485 Memobus interface, similar to the architecture implemented with
Magnetek's RDSI systems. An analog interface can also be implemented, but it is important to
understand the analog input and output resolution's effect on feedback accuracy before
implementation.
IMPULSE®•G+ & VG+ Series 4 Instruction Manual – February 2017
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