WPC 2000 User Manual 1128500
Glossary G-3
Micro-inch A WPC 2000 feature that allows the operator to set the amount
of time in milliseconds that the Dual Safety Valve is open and,
therefore, the distance the ram will travel when the Run/Inch
switches on the Operator Station are pushed in Inch mode.
Micro-inch is designed for high-speed and/or short-stroke
presses.
NEMA 12 A rating certifying that an electrical device is protected against
dust, water, and oil.
ninety degree (90°) stop-
time test
A test required to set the proper safety distance for personnel-
guarding devices, including light curtains, two-hand controls,
and type-B movable barriers. This test checks the stopping
time of the press at its most critical stopping point, normally
the midpoint of the downstroke (i.e., 90°), while the press is
running in Continuous mode (or Single-stroke if the press does
not have a selector setting for Continuous). Stopping time is a
value required in the ANSI formula for calculating the safety
distance.
object sensitivity A value required in deriving the depth penetration factor for a
light curtain. Object sensitivity specifies the smallest diameter
object that a light curtain will detect anywhere in its field.
ON-OFF setting Stroke angle settings at which the cam channel is to turn ON
(activate) and turn OFF (deactivate)
OSHA Stands for Occupational Safety and Health Administration, a
government agency that has established regulations for
mechanical power presses including presence-sensing devices
for point-of-operation guarding.
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.
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