Wednesday, December 14, 2011

Fujitsu DL6400 -- Cover Interlocks

There are two cover interlocks -- a safety interlock that disables carriage drive,[1] and a logical interlock that informs the controller of a cover open condition.

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The safety interlock switch resides at the upper right front corner of the chassis. Here's a view of it.

The switch is actuated indirectly by means of a pivoted paddle that's quite strongly spring loaded. 'Easiest way to cheat it is to clamp a small set of Vise-Grips on the upper corner of the switch's mounting bracket, just above the actuating paddle, like so.

Clamp on the Vise-Grips good and tight so they won't tumble on you while the machine is running.

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The logical interlock comprises two Hall-effect sensors at the upper edge of the control panel. They're 'actuated' by a permanent magnet embedded in the front of the access cover.

Cheating those sensors is a bit awkward; here's the best arrangement I've come up with for doing it so far.

Lash a suitable magnet in place with rubber bands. (The magnet in the photo is from a cabinet door latch.) The sensors are sensitive to magnetic polarity, so you have to experiment a bit to find the magnet orientation that works.

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Note:

[1] An inoperative safety interlock will cause a Left End Alarm condition. See this post for an explanation.

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