Ashley R Posted July 24, 2014 Share Posted July 24, 2014 Hi All Currently have yet another MAC 550 not playing ball. When it re-sets itself, it seems to re-set okay into its normal positions, then it tries to slam itself past the pan limit (cue a large amount of grinding and noises) Noticed that the sensor was missing a single tooth, but that shouldn't cause it? - as even when removed, it still went beyond the limits of the pan. Also checked that the end stop switch was working. This has me completely baffled. Its also showing a FBEP as expected, but I can't use the fixture as it thinks its home position is almost at the end of its travel, and just grinds about anywhere below value 100. any bright ideas? Link to comment Share on other sites More sharing options...
timsabre Posted July 24, 2014 Share Posted July 24, 2014 Could the pan motor be connected backwards?If this is a previously working fixture which has failed then this is unlikely. But if someone else has been messing with it or the motor has been swapped then you never know. Link to comment Share on other sites More sharing options...
theatretechie Posted July 24, 2014 Share Posted July 24, 2014 Have you tried to disable the FEEDBACK function in the menu? Also check the toothed encoded wheel for pan has all its teeth. Link to comment Share on other sites More sharing options...
DrV Posted July 25, 2014 Share Posted July 25, 2014 That sounds as if the feedback isn't working at all. I stand to be corrected but I think that during the reset the controller just moves the head by sending stepper pulses until it finds the limit switch. Thereafter it uses the feedback from the encoder and just assumes it can go 540 degrees from the limit without hitting anything. If you have teeth missing or a faulty/misaligned sensor then the controller will not know how far the head has gone. Check the teeth and the opto... Dave Link to comment Share on other sites More sharing options...
timmeh2 Posted July 29, 2014 Share Posted July 29, 2014 Hi Just to back up what DrV has said and I'd be checking to see if the limit switch is actually working as well. All the bestTimmeh Link to comment Share on other sites More sharing options...
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