IMPULSE•VG+ Series 3 Instruction Manual – 07/25/05
5-36
System Tare and Calibration
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.
For example: If C10-01 = 1, then the hoist will automatically pause at the speed programmed in
parameter C5-04 (6 Hz is the factory setting) 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 C5-04 or, if using an analog speed reference, then program B2-02 (minimum speed) so that it
is equal to C5-04.
3. Record the torque reading being displayed by the monitor parameter U1-09 (Torque Reference).
Repeat this step several times and record the average “No Load Torque” in parameter C10-06
(No Load Torque).
4. Attach all of the under hook attachments that are required during normal lifting (Chains, Slings,
spreader beam, etc.). 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 speed that the weight will be calculated at. See
Step 2 for an example.
6. Record the torque reading being displayed by the monitor parameter U1-09 (Torque Reference).
Repeat this step several times and record the average “Full Load Torque” in parameter C10-05
(Full Load Torque).
7. The monitor parameter U1-29 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.
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