About Malfunction detect
Malfunction detect around the press machine
Malfunction detector "PS-682" detects various processing conditions in automatic stamping and outputs a stop signal to the press machine when an abnormality occurs.
| Usage | explanation | |
|---|---|---|
| (1) | Material end detection | Detect material end with rayed sensor. |
| (2) | Buckling detection | Contact detection between the material and touch sensor when buckling. |
| (3) | Scrap detection | Detection of the scrap pass out from the die after stamping. |
| (4) | Miss ejection detection | Detection of workpiece ejection by passing though optical sensor. |
| (5) | Miss feed detection | Contact detection between the material and touch sensor after complete material feed. |
Passage detection and Feed detection
Passage detection and Feed detection check for the presence or absence of sensor input while the timing signal is ON.
Passage detection is used to confirm the ejection of products.
Feed detection is used to check the material feed.
The require signals are timing signal (TM), sensor input (IN) and passing storing (PS).
At the OFF edge of the timing signal, the following processing is performed.
・Confirm that passing storing is ON.
・Confirm that the sensor input is OFF.
If the above two conditions are not confirm, it is judged to be abnormal and the stop output is activated.
Operation example of passage detection
This is an example of the operation for passage detection.
The operating conditions are below.
・Timing signal：185°ON, 350°OFF
・Sensor input： Turn ON when passing the optical sensor
Operation example of feed detection
This is an example of the operation for feed detection.
The operating conditions are below.
・Timing signal：185°ON, 60°OFF
・Sensor input： Turn ON when the touch sensor is away from the material.
(For ease of comprehension, some timing signals differ from actual operation.)
About allowance angle function of PS-682 (patented)
The allowance angle is a new function added in PS-682.
Applicable detection is passage detection and feed detection.
The angle from the OFF edge of the sensor input to the OFF edge of the timing signal is called the "Allowance angle".
The PS-682 displays the allowance angle when the timing signal turns OFF.
Able to handle like below by looking at the allowance angle,
- If the angle is small or fluctuate, review the sensor type or installation method.
- If the angle is large, make OFF timing signal earlier or increase SPM etc.