SCREW-MACHINE 4B1255 - Caterpillar

Weigh Range Setup
The weigh range is the range of the linkage that measures the payload while raising the linkage. For accuracy:
The machine must not be digging
The linkage must not be accelerating in the weigh range
Illustration 1 g03750054
Weigh rangeFor best accuracy, allow 20% lift height between the start of lift and the start of weigh range.
20% will eliminate the effects of acceleration during lift
Lift acceleration looks like additional weight to the payload systemThis range must be adjusted from the default if:
End of dig or start of lift is higher than 30% (Then raise Start of Weigh Range)
Final height is below 65% (Then lower Start of Weigh Range)Software configuration parameters in Implement Configuration screen of Cat® Electronic Technician (Cat ET) are:
"Payload Weigh Activate Lift Position" = Start of weigh range - (50% default)
"Payload Weigh Range Configuration" = Size of weigh range - (15% default)To view linkage position in % and set the weigh range in the Information, touch:
Display: "Settings" > "Payload" > "Set Weigh Range"Improper Settings
The possible negative effects of improperly setting the "weigh range" must be understood. The weigh range should be set to an area that allows the smoothest operation to occur. The following table lists the possible problems that may occur from incorrectly adjusting the weigh range.
Table 1
Improper Setting     Result    
Setting the range too low     May cause poor weighing accuracy due to lift acceleration in the weigh range.    
Setting the range too high     May also cause excessive reweigh indications if the lift is stopped in the weigh range and poor accuracy if the lift kickout is hit in the weigh range.    
Setting the range too wide     May lead to poor accuracy due to the increased probability that machine operation could cause pressure instability in the lift cylinders (Lift velocity change).