User guide

Set Up 2 Page Description (continued)
Tuning the Belt Drive
Upper Belt - Additional Controls
The control for the upper belt includes additional controls that are there to help
balance the load between the two belts. Since motors, gear boxes and belts are
similar it is expected that gear ratio should always be 1.000:1. However, there are
always mechanical differences. If these are not compensated for one drive will
end up pulling the entire load and the other will act as a brake. The system here
attempts to keep a 1:1 gear ratio but checks the torque for each puller drive and
modifies gear ratio in order to keep the torque similar.
Adjustments that provide load sharing are at the lower section of the control
display. The read-only values are at the top section of the control.
Effects of Tuning:
• Command & Actual - These values show the commanded and actual RPM's
for the belt drive motor.
• Volts In - The upper belt drive obtains the torque from the lower belt drive as
an analog value. This is shown as Volts in.
• Gear Ratio - The Gear Ratio should be close to 1.000:1 for a balanced load.
This value should be allowed to change. It is recommended that this stays within
a maximum variance of 1%.
Upper Drive - Torque share parameters
Effects of Tuning
Load Sharing
4-82 l Operation
NOTE: All values under “Load
Sharing” can be changed by
pressing individual windows
and using the keyboard method
to alter the value.
See Operation
Section entitled Setting the
Cutter Length Scroll and
Keyboard Methods.
Results can
be viewed in the Effects of
Tuning portion of each section.
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