LINK Systems Omni II Automatic Setups Module - Manual (Page 27)

October 16, 2008 Manual Version 1.1
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slide adjust. Slide adjust motor(s) must be wired to the automatic shut height adjust board(s). In
addition, a transducer must be mounted in such a way as to detect slide adjust position and wired
to the automatic shut height board. Rotary transducers may be used when shafts that turn when
shut height is adjusted are accessible such as a shaft that drives a mechanical shut height
indicator.
Section 3.5.1 Rotary Transducer Mounting
The Automation Control module software supports the use of a rotary transducer for the slide
adjust position feedback. These transducers are based on dual resolvers to provide an absolute
position indication. Resolvers are tough and accurate rotary position sensors. By using two
resolvers mounted in an enclosure with one resolver geared down relative to the other, a multi-
turn resolver (typically around 100 turns or 180 turns) is created.
As mentioned earlier, just about every slide adjust system is different. Some point must be found
that rotates when the slide is adjusted. Some obvious points are the slide adjust motor shaft and
the shaft that drives a dial counter (if present) that indicates slide position. Depending on the
press, there may be other points that can be used. The resolver should be tied in to one of these
points and may need to be geared up or down. Requirements are:
a)
The resolver should be mounted where it will not be submerged in oil, grease, or other
contaminants.
b) The slide should travel no more than 1 inch per turn of the resolver.
c)
The cable from the resolver to the OmniLink II Press Automation Control Auto Setups
module should not be run with any high voltage wiring (i.e. 120/240 VAC). In fact, this
cable should be run in its own shielded conduit.
It is not necessary to know the exact gear ratio of slide travel to resolver turns - only that
condition “b” is met. The resolver may rotate in either direction relative to slide travel (i.e. the
resolver may rotate clockwise or counter-clockwise as the slide goes down).
Section 3.5.2 Rotary Slide Adjust Wiring
A cable must go from the dual resolver mounted on the slide to the Automatic Setup module.
Since the slide goes up and down relative to the machine, some means of stress relief must be
used on the cable between the slide and the machine frame. The recommended method is to use
a helical cable (same principle as a telephone handset cord) from the resolver to a junction box
on the bottom of the crown. This lets the wire run in a “spring” pattern to help it resist breaking.
Appendix B, Figure B.3 shows a conceptual view of this type of resolver mounting. The
junction box should be grounded to the machine to help shield the connections inside.