IMPULSE
®
•G+ & VG+ Series 4 Technical Manual
November 2020
Page 109
5.2.19 Weight Measurement
The IMPULSE
®
•G+ & VG+ Series 4 includes a Weight Calculation function that can be used in hoisting
applications. The weight measurement calculation is based on motor torque at a constant speed. The VFD must
pause the acceleration, wait for the torque to stabilize, and then perform the weight calculation based on the
system tare values. The function takes a reading one time per lift (Raise Run command) when C10-02 = 0
(Automatic), or it can be configured to take a reading at any speed with a Multi-Function Input when C10-02 = 1
(Manual). The calculated weight can be displayed on the keypad of the hoist VFD.
NOTE:
Weight Calculations will be more consistent when a weight measurement is calculated at the same speed
every time. Example: C10-02 = 01, weight measurement is always calculated at C10-05 speed. It is important
to note that after the load has been rigged, it should be suspended and the brakes should be set on the hoist.
When the next raise command is given, the hoist is now ready to calculate the weight of the load. The function
only works in the Raising motion (Fwd Run). If extreme accuracy is required, a load cell should be used.
The Weight Measurement function of the hoist VFD has an accuracy within 5% with VG+ VFDs and 10% with
G+ VFDs of the hoist’s rated capacity.
Table 5-35: Weight Measurement Parameter Settings
Parameter Display Function Range Default
C10-01 Load Weight Selects method for Load Weight measurements.
Measurement is reset at Brake Closed.
0–2 0
0 Disabled
1 Auto - I/T Enabled
2 Auto-Analog Enabled Analog (Load Cell)
C10-02 LW Start LW Measurement Start 0, 1 0
0 At C10-05
1 By MFDI=5C
C10-03 LW Display Hold Hold until next run command 0, 1 0
0 Hold Display
1 Hold Disp 3 Sec
C10-04* LW Conversion Multiplier of torque output calculation for display.
Data is n0000, so multiplier is 10000; “n” is
decimal point.
Example: 24000 = 40.00
0–39999 0
C10-05 Test Freq Frequency at which the Weight Measurement
will occur.
0–E01-04 Hz 6
C10-06 Unit Displayed Selects the units of measurement being
displayed on the keypad.
0–4 4
0 Tons
1 Pounds
2 Kilograms
3 Metric Tons
4 Percent Load
C10-07 Holding Time Time for holding output frequency to measure
weight.
0.0–2.55 sec 1.00
C10-09 Full Load Torque Percentage of Torque output that is considered
full load (VG+ only).
0.0–200.0% 100.0
C10-10 No Load Torque Percentage of Torque output that is considered
no load (VG+ only).
0.0–200.0% 20.0
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