LINK Systems OmniLink II Press Automation Control - Manual (Page 61)

August 30, 2002 Manual Version 1.0 4.12
Section 4.2.1.6 Use Mode Input Setting
The OmniLink II Press Automation Control provides an input that allows the user to provide an isolated
contact to the operator terminal, when this can be derived from the press clutch/brake control, to indicate
when the setup mode (usually Inch) is selected. When this input is provided, it allows die protection
functions and counters to be bypassed when a setup mode is selected, if desired. Manual bypass of die
protection and counters is also always available even when the Use Mode Input setting is Yes.
If this contact is wired as an input as described in the installation section of this manual, The CHANGE
SETTING softkey should be used while Use Mode Input is selected to toggle the setting to “Yes”. If
the Mode Input is not used, select “No” as the setting.
Section 4.2.1.7 Setting Clutch Engagement Time Limit
When the press control sends an electrical signal to the clutch/brake valve(s) to start stroking the press,
there is a time delay before the air (or hydraulic on a few presses) flow can push the clutch plates
together and ramp up crank speed (the clutch plates slip till flywheel or gear RPM is reached) to the
setting made for Minimum Press Speed (see section 4.2.1.3). This is illustrated in Figure 4.9
Figure 4.9 Illustration of Clutch Engagement Time.
The Clutch Engagement Time Limit is used two ways by the system. First, the motion detector will not
issue a fault, which stops stroking when the press clutch/brake control sends a stroking signal to
clutch/brake valve, as long as motion starts within the time limit set for clutch engagement. Secondly,
the Clutch Engagement Time limit provides useful diagnostic information relating to clutch wear. As
clutch plates wear, increasing the volume of air that must flow into and be stored in the clutch air
operator, clutch engagement time gradually increases. The increased volume of air stored in the clutch
also takes longer to flow out when the air valve dumps pressure to stop stroking, resulting in longer
stopping time for the press. When clutch wear reaches the point where actual clutch engagement time
exceeds the limit, a fault will result that stops stroking and will be displayed as the reason for the last
stop. Most (though not all) presses provide for adjustment or shimming to compensate for clutch wear.
Exceeding the clutch engagement time limit tells you that clutch adjustment or shimming should be
performed. When possible, it is preferable to adjust the clutch clearance to the press manufacturers
recommended setting to determine the clutch engagement time with optimum clearance.
To determine the value to enter as the Clutch Engagement Time Limit, put the press in Single
Stroke Mode and stroke the press several times. Record the Clutch Actual Engagement Time indicated
by the system on the Machine Parameters screen at the end of each stroke. Some margin for wear must
FLYWHEEL RPM
Minimum Press Speed SPM
TIME
CRANK RPM
Clutch Eng.
Time