IMPULSE®•G+ & VG+ Series 4 Instruction Manual – February 2017
5-44
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 drive 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 C10-01 = 1 (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 drive.
NOTE: Weight Calculations will be more consistent when a weight measurement is calculated
at the same speed every time. Example: C10-01 = 1, 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 drive has an accuracy within 5% with
VG+ drives and 10% with G+ drives of the hoist’s rated capacity.
Table 5-35: Weight Measurement Parameter Settings
Parameter Display Function Range Default Model
C10-01 Load Weight Selects method for Load Weight
measurements. Measurement is
reset at Brake Closed.
0–2 0 G+/VG+
0 Disabled
1 Auto - I/T Enabled (VG+ Only)
2 Auto-Analog Enabled Analog
C10-02 LW Start LW Measurement Start 0, 1 0 G+/VG+
0At C10-05
1 By MFDI=5C
C10-03 LW Display Hold 0, 1 0 G+/VG+
0 Hold Display Hold until next run command
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 G+/VG+
C10-05 Test Freq Frequency at which the Weight
Measurement will occur.
0–E01-04 Hz 6 G+/VG+
C10-06* Unit Displayed Selects the units of measurement
being displayed.
0–4 4 G+/VG+
0Tons
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 G+/VG+
C10-09 Full Load Torque Percentage of Torque output that
is considered full load.
0.0–200.0% 100.0 VG+
C10-10 No Load Torque Percentage of Torque output that
is considered no load.
0.0–200.0% 20.0 VG+
* Used for keypad display; consult factory for assistance.
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