Optional wiring connections
The following sections explain other connections you can make to AutoSet. Except for zero
cam wiring (required in some cases), these connections are optional.
The sections below cover:
• connecting a zero cam switch (installing an LMCS)
• connecting a remote reset switch
• connecting a strip chart recorder
Installing a zero cam switch (optional)
There will be instances where you will need a cam switch to signal AutoSet at the start of
each stroke. This signal is called the zero signal. In general, AutoSet zeroes automatically.
However, for high speed presses and for certain other applications, you must install a cam
switch to provide AutoSet with the zero signal. When you may need a zero cam switch is
Zero cam needed for high speed presses
For presses that operate over 400 strokes per minute, a zero cam must be wired to the AutoSet
1500. AutoSet cannot automatically zero itself fast enough at these press speeds. It must
signal AutoSet near top dead center of each stroke. AutoSet will then erase tonnage readings
from the previous stroke and get ready to record readings for the next stroke.
Other conditions when a zero cam is needed
For slower presses, a zero cam is not usually needed. AutoSet has enough time during the
stroke to zero itself automatically. However, in some instances, a zero cam may be needed
even for a slower press. Without a zero cam connected, AutoSet will not read tonnages less
than 5 percent of full scale tonnage. Therefore, if you will be using AutoSet on jobs where
less than five percent of press capacity is used, you will need a zero cam.
There are other instances where a zero cam may be needed. Some presses produce tonnage
over five percent of full scale at the beginning or end of a stroke. For instance, some presses
in single stroke operation will produce tonnages over five percent when they stop at top stop.
Also, some presses in continuous mode produce abnormally high or low tonnage at the
beginning or end of the stroke for the first few strokes only. This tonnage is produced by vi-
brations (also called ringing) or start-up torque.
A zero cam should be used in these cases. With a zero cam, AutoSet will record tonnage only
during the portion of the stroke when the zero signal is absent (off). When the zero signal is
set on between 240° and 30°, AutoSet will ignore tonnage produced during the beginning or
end of the stroke. Before installing a zero cam, be sure some other condition (loose wires,
improper calibration) is not causing erroneous tonnage readings. Also, do not hesitate to
contact Data Instruments if you need assistance in determining whether to install a zero cam.
AutoSet 1500 User Manual