LINK Systems 5100-8 Tonnage & Analog Signal Monitor - Manual (Page 57)

Doc #: L-802-1110 Page 55 Rev. 02
A simple method of determining if the Tonnage Monitor is at the end of the bus is to check the high
speed bus connector. If only one cable is wired into this connector, then the unit is at the end of the bus.
If two cables are wired into the connector, then the unit is not at the end of the bus and termination
should not be made active.
6.6 Strain Gage Locations
6.6.1 "C" Frame Machines
Machines with "C" frame configurations, such as OBI and GAP frame presses, should be installed with
one strain gage mounted to each side frame member and the tonnage monitor configured for 2 channel
operation.
Choices of strain gage mounting
locations are illustrated in Figure
28. The preferred mounting
locations are near the middle of the
front of the "C" frame. The forces
that occur at the front of the
machine frame are tensile forces.
The compression forces that occur
at the "acceptable" locations at the
rear of the "C" frame can be
accompanied by nonlinear
buckling (bending) on the thin web
side frames of some machines.
Do not mount strain gages near the
curves at the front of the "C"
frame. The curvature of the frame
produces nonlinear strain signals.
Also, on presses with increased
cross sections near the front of the
frame, avoid mounting sensors
next to the change of cross section
to avoid nonlinear strain signals.
The center portion of the front face of the "C" frame is an excellent sensing location, but sensors are
susceptible to damage from die setting operations.
Preferred
Mounting
Area
(Tension)
Acceptable
Mounting
Area
(Compression)
Neutral
Zone
Preferred
Mounting
Area
(Tension)
Acceptable
Mounting
Area
(Compression)
Neutral
Zone
Figure 28: “C” Frame Machine Gage Locations
6.6.2 Straight Side Machines
Straight side presses should be monitored with one strain gage on each corner of the frame and the
tonnage monitor module configured for 4 channel operation. On machines with tie rod through hollow
upright (column) construction, strain gages may be mounted on either the tie rods or the uprights,
although ease of installation usually dictates mounting the strain gages on the uprights. On solid frame
straight side machines, the uprights are also the best strain gage locations.