This document explains operation and maintenance of the Pneumatic Door Interlock.

PN: 93-2242 INTERLOCK PNEUMATIC INSTALLATION KIT

 Note: If the Door Interlock Cover is attached to the Interlock body with the one way security screws use the T-2198A to remove the screws.

Note: The picture shows the section view of the right side door closed and the interlock is in the LOCKED position. For proper Interlock operation machine needs to be in the RUN mode. Refer to the Operator's Manual for more information about RUN\SETUP mode.

When the machine's door is closed, the interlock stop block [1] moves past the interlock piston [2]. This triggers the normally open (NO) proximity sensor [3] to close the DOOR CLOSED circuit.

When commanded to lock the door, air pressure applies to the interlock air inlet [4] and forces the interlock piston [2] down against the O-ring [5]. The end of the piston then extends out of the interlock body into the path of the interlock stop block so the door can not be opened.

When commanded to unlock the door, air pressure is vented to the atmosphere and the return spring [6] retracts the interlock piston back into the interlock body and clears the path of the interlock stop block so the door can be opened.

For the proper Door Interlock operation, the gap R (between the top of the interlock stop block and the bottom of the proximity sensor) and the gap S (between the back side of the interlock stop and the interlock piston when door is fully closed) needs to be set and maintained within the following limits:

• The gap R should be set to 0.0" - 0.09"
• The gap S should be set to 0.06" - 0.25"

To check the gap R use the tab A on the T-2199. Try to insert the tab A between the proximity sensor and the top of the interlock stop block when the door is fully closed. If the Tab A fits in the gap, then the gap is too large. To adjust the gap A change the interlock stop block with the one that has an appropriate height.

Note: The Pneumatic Interlock Installation Kit (P/N 93-2242) contains three types of the stop blocks: 1/16", 1/8" and 1/4" in height. You can stack up to two different stop blocks to achieve the appropriate height.

To check the gap S use the tabs B and C on the T-2199. If the tab C does not fit in the gap then the gap is too small. If the tab B fits in the gap then the gap is too large. If the gap C is not within the limits, adjust the door bumper.

The pneumatic door interlock could get contaminated due to the poor shop air quality. If during the operation of the interlock the piston does not move IN/OUT freely or there is an air leak out of the interlock you can disassemble and clean the interlock internals.

Disassemble the interlock in accordance to the exploded view diagram. Clean, inspect and apply a thin coat of the silicone grease to the following components:

• Top o-ring [1]
• The piston shaft [2]
• Return spring [3]
• Lower o-ring [4]
• The bore inside of the interlock body [5]

Assemble the interlock in accordance to the exploded view diagram.

To check the operation of the interlocks make sure that the machine is in the RUN mode. Close the doors and command the slow continuous axis motion in MDI. Try to force the doors to open while the axis is in motion. If the interlock is properly aligned you should not be able to force each door to move more than 0.25" from fully closed position. Shake the doors with significant force while axis in motion. If the axis motion stops and control displays DOOR HOLD message, then the height of the interlock stop block needs to be corrected.

Important: Damaged or loose door rollers will affect the alignment of the interlock. Make sure to check the door rollers if you experience a continuous issues with the door interlock alignment.