AMETEK 1025 Foot & Palm Switches - Manual (Page 11)

7 Operating Manual
Chapter 3: Operating Instructions
3.3: Set the TIME UP/TIME DOWN Switch
NOTE: When testing the top stop, the distance determined in step 3 will correspond
to the 270 degree position of the crankshaft when the TIME UP/TIME DOWN
switch is in the TIME UP position.
The TIME UP/TIME DOWN switch is used to select the direction the press (closing
or opening) is moving when the automatic stop command is given. This switch must
be properly set even when a manual test, with the optional manual start switches,
is performed.
NOTE: The Gemco Semelex II Safetimeter has the capability to check both down and
up stop times to aid in setting the press counterbalance.
For best results, the down stop time test should be initiated at 90 degrees, and the
up stop time should be initiated at 270 degrees. During these tests, it is important to
stop the ram before the dies engage on the down stoke and before top dead center on
the up stroke. On some presses, however, the ram may take more than 90 degrees to
come to a complete stop. If so, adjust the CSP as follows:
1. On the down stop time test, increase the Control Stop Point (CSP) setting to
initiate a stop between 0 and 90 degrees. Continue increasing the CSP and
testing the press until the ram can be stopped before the dies engage.
2. Similarly, on the up stop time test, decrease the CSP setting to initiate a stop
between 180 and 270 degrees. Continue decreasing the CSP and testing the
press until the ram can be stopped before top dead center.
It is important to test both the down and up stop times using the same press control.
Typically, an inch button or two-hand control in the inch mode is used since the up
stop time test is not possible in the single-stroke mode with two hand controls.
Adjusting the counterbalance air pressure to obtain near equal down and up stop
times will set the counterbalance at is optimum point.
NOTE: Always follow the press manufacturer’s recommendations for setting the
counterbalance. Several down stroke Safety Distance and/or Stop Time tests
must be performed after setting the counterbalance to ensure proper press
operation and guarding.
3. The distance determined in step 7 (number displayed on the CSP dial) is the 90
degree point of the crankshaft, which includes allowance for the cable angle.