1126800 SmartPAC 2 with WPC Integration
Page 346 Chapter 6 SmartPAC 2 Run Mode
Stopping Angle
Stopping angle is the crankshaft rotation angle that it takes for the press to stop. It is the
stopping position in degrees minus the crankshaft position when the Dual Safety Valve
(DSV) is closed. Stopping angle will compensate for the complete rotation when it takes
more than 360 degrees to stop. You can use Stopping angle to help you when you determine
critical angle for your die protection system.
Brake Warning
The brake monitor in WPC accurately monitors the stopping time of the press on every top
stop. Each time the press top stops, WPC determines if the stopping time is within the preset
stop time limit. Any time that the stopping time is within ten milliseconds of the stop time
limit that you set in SmartPAC 2, "Brake Warning" LED on the front of SmartPAC 2
illuminates. This warning alerts maintenance to perform the necessary repairs on the press.
Whenever the stopping time is outside the safety range, WPC immediately inhibits the press
from further operation and displays a message on the LCD display (see Chapter 7). When this
happens, you cannot run the press, until you have completely corrected the problem.
Performing the 90° Stop-Time Test
The 90° stop-time test is required in order to set the proper safety distance for personnel
guarding devices including light curtains, two-hand controls, and type-B movable barriers.
This test is done at the press's most critical stopping point -- 90°. The worst case scenario
occurs half-way through the downstroke at 90° while the press is running in continuous
mode. Therefore, SmartPAC 2 is designed to check stopping time at that critical crankshaft
angle, and provides you the T
s
value referenced in ANSI B11.1-2001. Follow these steps to
perform the 90° stop-time test:
1. Install the heaviest upper die set into your press. Adjust the counterbalance for ram
weight, if your press has a counterbalance.
2. Set the PROG/RUN key to "Run" to get into Run mode. Then select "Brake monitor"
from the Main Run menu. You will see this display:
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