LINK Systems OmniLink 5000 - Manual (Page 20)

April 17, 2000 Man ual Revisio n 1.0
3.5
Section 3.2.2 Data Window Off Angle
The Off Angle for a data window is the angle at which the setpoints for that data window stop being
enforced. For example, in Figure 3.5, data window 1 has an off angle of 170 degrees.
Section 3.3 Limits
The tonnage monitor can compare the tonnages it reads to limits set for each job. The following sections
detail these limits.
Section 3.3.1 Machine Rating Limit
The machine rating limit, unlike low and high limits, is intended to protect the machine rather than the
tooling. This limit is 125% of the tonnage rating for each channel. For instance, on a 400 ton machine
with a four channel tonnage monitor module, each channel is rated at 100 tons (400 ton machine divided
by four channels). The machine rating limit for each channel in this case is 125% of 100 tons which is
125 tons. Note that it is possible to get a machine rating alarm even though the total tonnage does not
exceed the machine rating. Suppose the tonnages for the above machine read 80 for channel 1, 90 for
channel 2, 130 for channel 3, 80 for channel 4, and 380 for the total. A machine rating alarm would be
indicated on channel 3 even though the total tonnage was less than 400 tons. A machine rating alarm
results in a Cycle Stop to the press. Unlike high, low, and reverse limits, this limit can NOT be
bypassed.
Section 3.3.2 Low Limits
A Low Limit is the minimum tonnage required to properly produce a particular part. There are separate
low limits for each channel of the tonnage monitor for both the peak tonnages and data window
tonnages. If something in the process changes during normal operation that causes any channel to not
reach its’ minimum limits, a Top Stop is provided to the press control in order to stop the process. In
stroking modes Inch and Timed Inch it is common the operate the press without material in the die
during the setup operation. In order to prevent unintended Top Stops, the tonnage monitor module will
automatically turn OFF the Low Limits during these modes. The Low Limit for a particular channel can
NOT be set greater than or equal to that channels' High Limit.
Section 3.3.3 High Limits
High Limits should be set above the maximum tonnage required to properly produce a particular part
and is set for each channel of the tonnage monitor for both peak and data window tonnages. If
something in the process changes during normal operation that causes the tonnage developed to exceed
this maximum limit, a Stop Signal is provided to the press control in order to stop the process. The
tonnage monitor module can be configured to generate either a Top Stop or a Cycle Stop when a high
tonnage alarm occurs. It can also be configured to generate a Cycle Stop AND Turn Off Hydraulic
Overload Outputs when a high tonnage alarm occurs.