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Link 2600 User Manual

Link 2600
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Doc #: L-2600-1023 Page 59 Rev. 02
4.4.2 Motion Threshold
Press SPM must exceed the “Motion Threshold” after stroke initiation if the main motor is running in
the forward direction (see Figure 47 for the relationship between “Engagement Time” and “Motion
Threshold”). Failure to establish motion will result in an immediate stop and the reason for the last stop
will display Motion Did NOT Start.
It must also maintain motion above this limit while the press is stroking (see also “Loss of Motion
Time” and Figure 48). Failure to maintain motion above this threshold while stroking will result in an
immediate stop and the reason for last stop will display Motion Stopped. Whenever slide motion is at
rest and the press control is not energizing the clutch/brake valve(s), crankshaft motion must remain
below this threshold. If motion above the threshold occurs for greater than 250 milliseconds it will
result in a stop and the present running status will display Motion w/o Clutch Signal.
This parameter can be set from 0 to 255 SPM and generally should be set 10% to 30% below the slowest
normal stroking speed of the press.
4.4.3 Loss of Motion Time
The “Loss of Motion Time” is provided
because mechanical backlash of drive
system components can cause the
crankshaft to turn in a jerky motion,
falling below the motion threshold for
very brief periods of time. Figure 48
shows an exaggerated illustration of this.
The “Loss of Motion Time” setting is
chosen to prevent nuisance stopping by
permitting press SPM to drop below the
“Motion Threshold” for brief periods of
time without the assertion of a stop.
For typical applications this parameter should be set to:
Time (in milliseconds) = 3500 / Max SPM
For example, if the press maximum speed is 100 SPM, then this value would be set to:
3500 / 100 = 35 milliseconds
Like wise a press with a maximum speed of 20 SPM would be set to:
3500 / 20 = 175 milliseconds
Press SPM
Time
Average SPM
Motion Threshold
Loss of Motion
Figure 48: Loss of Motion Time and Motion Threshold
NOTE: If the loss of motion time value calculated by the formula is shorter than the
time that motion can dip below the “Motion Threshold”, loss of motion
faults will result. If these occur, you may increase the time calculated by the
formula but, in no case should this time be increased more than 2.5 times
the value calculated by the formula.

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Link 2600 Specifications

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Model2600
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