Wintriss autoset 1500, Руководство пользователя

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1137200 AutoSet User Manual
2-16 Installation
Installing a Zero Cam
A “zero cam” is a cam switch that sends a signal to AutoSet near the beginning of each stroke.
This signal, which is called the zero signal, turns on at a crankshaft angle of 240° and turns off
at an angle of 30°. The zero signal clears, or “zeroes,” the tonnage reading on each stroke and
prevents AutoSet from registering any tonnage events within the zero cam window. The zero
cam ensures that AutoSet records press tonnage occurring near the bottom of the stroke and
not tonnage events associated with the beginning or end of the stroke.
The zero cam window also enables AutoSet to determine what proportion of the tonnage
recorded on each stroke is being produced by expansion of the press frame as the press heats
up during the day and to correct the displayed tonnage accordingly.
A zero cam is recommended for standard AutoSet 1500 and 1504 load analyzers and is
required for AutoSet 1500 Plus and 1504 Plus units. A latching magnetic cam switch (LMCS)
to provide the zero signal is available from Wintriss.
Using a Zero Cam on Standard AutoSets
A zero cam is recommended for standard AutoSet load analyzers and is required in the
following cases:
•
When your press operates at speeds greater than 400 strokes per minute. AutoSet cannot
zero itself at these speeds.
•
When presses that operate at speeds slower than 400 strokes per minute run jobs at
tonnages less than 5% of press capacity. AutoSet cannot detect tonnages beneath the 5%
threshold and, therefore, cannot reset itself when tonnages are lower than 5%.
•
When presses generate tonnage readings greater than 5% at the beginning or end of a
stroke. For example, some presses when running in Single-stroke mode produce tonnages
greater than 5% when they complete their stroke at Top Stop. When AutoSet detects these
Figure 2-12. Shield Drain Wire Connected to Ground Stud on Enclosure
Secure drain wire
under nut on
ground stud
Drain wire
Strip cable jacket
as far as end of
conduit fitting