LINK Systems OmniLink 5000 - Manual (Page 50)

April 17, 2000 Man ual Revisio n 1.0
5.5
Figure 5.3: Machine Rating Configuration Screen
Section 5.2 Machine Rating
This selection displays the screen shown in Figure 5.3. Changes are made with the RUN/PROG keyed
selector switch in the PROG position by positioning the cursor onto the desired parameter with the
arrow keys, using the numeric keypad to set a new value, and pressing the ENT key or through the
softkeys provided.
The Machine Rating is the total capacity of the machine frame as defined by the press manufacturer and
is typically specified at some position off the bottom of the stroke. The tonnage monitor will use this
parameter along with the number of channels to determine the rating of each channel. The scale factors
calculated are used to translate strain gauge outputs into tonnage values. This value should be set at the
time that the tonnage monitor module is installed and not changed afterward.
Section 5.2.1 Decimal Point
The tonnage monitor module can measure and display tonnages 150% greater than the machine rating.
A machine rating greater than about 660 tons could not show the entire measurable range with a display
format of 999.9. For machine capacities greater than this, the tonnage monitor module should be
formatted to display without the decimal point (9999). The format (decimal point position) is selected
by pressing the desired softkey.
Section 5.2.2 Derate Total Tonnage
A mechanical power press is typically specified by its manufacturer with a tonnage capacity rating and a
height off of the bottom of the stroke at which this rating applies. One reason for this is that an
mechanical advantage is created in the translation of rotary motion of the crankshaft to linear motion of
the slide that changes depending upon crankshaft angle. The constant torque of the clutch develops
more downward force as the crankshaft angle travels from 90 degrees (mid stroke) to 180 degrees
(bottom).