AMETEK 1025 Foot & Palm Switches - Manual (Page 15)

11 Operating Manual
Chapter 3: Operating Instructions
5. Tape the switch temporarily over the control button. Cycle the press. When
pressing the Manual Start Switch and E-STOP button simultaneously, the press
begins to stop and the Safetimeter starts counting. After the press stops, the
Safetimeter displays STOP TIME in milliseconds. Similarly, the Normally Open
Manual Start Switch released simultaneously with the RUN or INCH button
starts the Safetimeter counting upon release.
NOTE: Run several tests, initiate stops at the same position in the stroke. Results
should be fairly repetitive. Use only the largest values in determining safety
distance to be used. Prudent judgement suggests adding 10% to 20% to the
readings being measured.
NOTE: The Auto-Hand and P/V Transducer are not used with the Remote Tachometer.
3.8: Using Optional Remote Tachometer
1. To calculate the Stop Angle requires a press stop started exactly at 90 degrees
or 270 degrees, use the Auto-Hand. Set the Control Start Point (CSP) to 90
degree crankshaft position. To set the CSP, see Section 3.2: Set the Control
Start Point (CSP).
2. Raise the press to top stop, then cycle the press. The press will begin to stop
when the ram reaches 90 degrees. Leave the ram where it stopped.
3. Rotate the CSP dial counterclockwise somewhere below the point where the ram
is stopped. This will be approximate, accuracy is not required.
4. Rotate the CSP dial clockwise until the Safetimeter starts to count.
5. Switch the Safetimeter OFF then ON to reset the counter.
6. Repeat steps 3-5 until the CSP dial displays the new position of the stopped ram.
7. Subtract the stopped ram position in step 6 from the 90 degree position in step
1. The result is the distance the ram moved after a stop occurred. This distance
is called, “ram or slide after-travel”, “stopping distance” or “over-run”.
8. Use the curve in the following fi gure to determine the stopping angle. This curve
is based on a connecting rod to stroke length ratio of two (2).
Example: 16” connection rod, 8” stroke = 2.0. Lower ratios than 2 will have smaller
stopping angles. Higher ratios will have greater stopping angles. The curve is useful
for ratios of 1.5 to 4.0 and across the 15 degree to 40 degree stopping angle range.
Higher ratios and larger than 40 degree stops should not use this curve.