Brake Monitor; Setting Stop Time, Stop Angle, And Start Time; Start Time - Honeywell SmartPAC 2 User Manual

SmartPAC 2 with WPC Integration

BRAKE MONITOR

(RUN – BRAKE MONITOR)
DANGER
!
Incorrect safety distance due to incorrect stop time
• Perform a 90 ° Stop Test any time you change the stop time limit. (See "Performing the 90 °
Stop-Time Test," page 346.)
• Recalculate the safety distance based on the new stop time limit and adjust or reinstall
safeguarding devices according to the new safety distance.
Failure to comply with these instructions will result in death or serious injury.
NOTICE
Find instructions for running the press at the end of this chapter, starting on page 364.

Setting Stop Time, Stop Angle, and Start Time

In Run mode, you can view stop time and stop angle, and you can perform the 90° stop test
to determine the longest stop time of the press. You can also get a reading for the start time
of the press.
Stop time is the time that it takes the crankshaft to stop once the dual safety valve (DSV) has
been de-energized. Start time is the time it takes for the crankshaft to start turning after the
DSV has been activated. Stop angle is the number of degrees that it takes the press to stop.
It is equal to the stopping position in degrees minus the crankshaft position when the DSV is
closed. (Stop angle does not compensate for the complete rotation when it takes more than
360° to stop.) The stop angle helps you when you set up the top stop cam. For example, if
the stop angle is 100°, set the top stop cam to turn on at 260°. For a discussion on the brake
monitor, see the section "Brake Monitor" in Chapter 4.
You need to determine the press's stopping time under normal stopping conditions, which is
usually top stop. Therefore, the stop time limit must be calculated based upon stopping time
at top stop.

Start Time

Every press takes a finite amount of time from the point when the Dual Safety Valve (DSV)
is energized to when the resolver signal indicates to WPC that it is turning. This elapsed
time, primarily taken by the clutch mechanism, is called Start Time. WPC needs an internal
limit for the start time to detect resolver drive failure. The display provides the Start Time
the last time that the press was started.
SmartPAC 2 Run Mode Chapter 6
1126800
page 345