LINK Systems Omni II Automatic Setups Module - Manual (Page 38)

October 16, 2008 Manual Version 1.1
4-10
Type “B” and “C” valve systems may be used to provide a minimum
pressure through their manual regulator. This keeps the cushion from
falling due to air leakage when the control is powered off and prevents
cushion pins from falling through the lower die shoe and bolster.
NOTE! Cushions can always drift down when the plant air supply is
off. Also, if a type “B” valve is used, Min Pressure must be set above
the manual regulator setting.
Tolerance
This is the amount by which the system will allow the pressure to vary and
still be considered “good”. For instance if tolerance is 2, then a setting of
30 psi will be considered “At Pressure” from 28 to 32 psi. Suggested
setting is 2.
Fault Time
If the pressure in the cushion goes out of tolerance due to a leak or any
other reason, a countdown starts. The control will try to bring the pressure
back into tolerance before the countdown expires. If it cannot correct the
pressure, the press will be stopped. The fault time is the countdown in
seconds. Suggested value is 20 seconds.
Transducer Full Scale This value depends on the full scale rating of the pressure transducer
being used. All pressure transducers must have a 4 to 20 milliamp output.
The “Transducer Full Scale” is the pressure that the transducer is reading
when its output is 20 milliamps. It is suggested that the full scale rating of
the transducer be at least two times the maximum air pressure rating of the
cushion. Since cushion air pressure is not constant and increases as the
slide approaches bottom dead center, a transducer rating of at least two
times maximum air pressure is suggested.
Section 4.2.2 Configuring Slide Adjust Modules
The OmniLink II Press Automation Control Automatic Setups module can control press slide
shut height. To start the configuration process for an installed slide shut height adjust system,
the hardware slot must be told which of two possible slide shut height adjust systems it is to
control. Either Slide Adjust 1 or Slide Adjust 2 can be controlled by the system. In Figure 4.3,
Slide Slot 1 has already been assigned for control of a Slide 1. If it is necessary to add, change,
or modify an Slide Slot assignment, move the cursor to the Air Slot to be modified and press the
CHANGE SETTING softkey. A list of available assignments, Slide 1 or Slide 2 for the Slide
Slot will appear. Move the cursor to the desired assignment and press the SELECT softkey. The
majority of applications will have only one slide adjust system. These applications should have
Slide 1 selected.
Section 4.2.2.1 Configuring a Rotary Slide Adjust System
After a control function has been assigned to a Slide Slot, the system must be configured. This
configuration sets parameters, such as minimum shut height, maximum shut height, and