LINK Systems 5100-8 Tonnage & Analog Signal Monitor - Manual (Page 12)

Doc #: L-802-1110 Page 10 Rev. 02
2.2.1 Data Window Start Angle
The Start Angle for a data window is the angle at which the setpoints for that data window start to be
enforced. For example, in Figure 3 data window 1 has a start angle of 165 degrees.
2.2.2 Data Window End Angle
The End Angle for a data window is the angle at which the setpoints for that data window stop being
enforced. For example, in Figure 3 data window 1 has an end angle of 170 degrees.
2.3 Limits
The tonnage monitor can compare the tonnages it reads to limits set for each job. The following
sections detail these limits.
2.3.1 Machine Rating Limit
The machine rating limit, unlike low and high limits, is intended to protect the machine rather than the
tooling. This limit can be configured to be between 100% and 125% of the tonnage rating for each
channel with a typical value of 125%. 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 would be 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.
2.3.2 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 issued. In setup modes (Inch and Timed Inch for the 5000
press control, setup mode input active on the automation control) it is common to operate the press
without material in the die during the setup operation. In order to prevent unintended stops, the tonnage
monitor can be configured to 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.
2.3.3 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 (configurable as Cycle Stop, Top Stop, or Intelli-Stop) is issued.