Setting The Start Time Limit At Press Parameters - Honeywell SmartPAC 2 User Manual

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Power down SmartPAC 2 with WPC and power it up again to make the new switch
setting take effect.
About 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. The worst case scenario occurs
halfway on the down stroke at 90° while the press is running in continuous. Therefore, WPC
is designed to check stopping time at that critical crankshaft angle, and provides you the T s
value referenced in ANSI B11.1 2001.
To properly perform the 90° stop-time test, follow the steps in "Performing the 90° Stop Time
Test," page 346 and "Calculating the Safety Distance," page 348, under "Brake Monitor" in
Chapter 6.

Setting the Start Time Limit at Press Parameters

Every press takes a finite amount of time from energizing of the Dual Safety Valve (DSV) 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.
After initialization, the start time limit defaults to 500 ms. After the press makes its first
stroke, WPC automatically resets the start time to twice the actual start time. Wintriss
Controls recommends that you use this automatically set start time.
However, if you want to set the start time manually, follow the steps below.
1. Select "Press Control" from SmartPAC's Initialization menu (Figure 4 - 1). The WPC
Initialization menu (Figure 4 - 28) appears.
2. Select "Press Parameters." You will see a display similar to Figure 4 - 29. Use the
cursor keys to select "Start Limit." Notice the value for Start Time Limit will be
highlighted.
3. To change this value, press ENTER. Change the value using the number keys and then
press ENTER to accept the change. (For assistance in using the number keys, refer to
Chapter 3.) Press RESET when done.
NOTICE
If you manually set the start time limit, you should normally use a value at least 40% greater
than the measured start time of your press.
Example
Your measured start time is 250 ms. You want to set a start time limit 40% greater than
the measured time.
Page 234
Take 40% of 250: = 0.40 x 250 = 100
Add 100 to 250:
Chapter 4
SmartPAC 2 with WPC Integration
250 + 100 = 350 ms.
SmartPAC 2 Initialization Mode