Wintriss SmartPAC 2, User Manual

Page: 545 / 604

SmartPAC 2 with WPC 2000 Integration User Manual 1128600
Glossary GL-5
overrun limit switch A device mounted on the press to check the accuracy of the
crankshaft angle maintained by the resolver. The overrun limit
switch consists of a magnet, which is mounted on the crankshaft
(or other shaft), and a stationary magnetic switch, which is
mounted just above the magnet so that it detects the magnetic
field on every stroke. The magnetic switch is also called an
“overrun sensor.”
WPC 2000 checks the resolver crankshaft angle by comparing it
to the signal received from the overrun limit switch. When the
signal is not received at the same resolver angle on every stroke,
WPC 2000 knows that the resolver is no longer rotating at a 1:1
ratio with the press.
overrun timing A WPC 2000 feature that provides a backup for top-stop timing,
stopping the press if the top-stop output relay should fail.
Overrun timing is a function of the stopping time of the press and
is influenced by the condition of the brake linings and press
speed. It is also dependent on proper installation of the
overrun
limit switch
.
palm time
The length of time within which the two palm switches on each
Operator Station connected to WPC 2000 must be activated in
order to start the press. This interval is 1/2 (0.5) second as
required by ANSI. If the palm time on any Operator Station is
exceeded, the press will not start. ANSI standards refer to the
palm time as
synchronous time
.
pinch point The hazardous area between the upper and lower die from which
OSHA mandates that the operator should be protected by
installation of safety equipment such as light curtains, two-hand
controls, and other barriers.
PMA Stands for Precision Metalforming Association.
reset A command issued by the operator that allows the press to
resume operation after it has been stopped due to a malfunction.
The “reset” command clears the fault message from the
SmartPAC 2 display. The command is issued by pressing the
RESET key.
resolver An electrical component mounted on the press used by
SmartPAC 2/WPC 2000 to provide continuous information about
the position of the crankshaft and to maintain a count of the
number of revolutions it makes. The resolver, which has internal
windings and works on the principle of inductance, turns at a
one-to-one ratio (1:1) with the crankshaft.