IMPULSE•G+/VG+ Series 4 Technical Manual
November 2022
Page 106
5.2.19.1 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 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 lifting device used for each lift should be manually subtracted from weight that is
calculated by the hoist VFD.
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.
5.2.19.2 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 num-
ber 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:
5.2.19.3 Weight Measurement Design Considerations
1. The VFD’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 VFD’s weight measurement feedback on an auxiliary display, such as a radio or PLC
interface, the most accurate feedback can be obtained from the VFD with the use of the VFD’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.
Содержание Impulse G+ series 4
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