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Author Topic: Franklin Designs TDM-1025 masking motor control issue Ken Lackner Phenomenal Film Handler Posts: 1907 From: Atlanta, GA, USA Registered: Sep 2001 posted 06-28-2019 03:33 PM                     Side-movable masking using a TDM-1025 motor. When opened all the way up to Scope, when I press the Flat button on the automation or issue a Flat cue, the masking closes in a little towards the Flat position and then stops. Press the button again, it moves a little more. Again, and again. About four times, total, for it to reach it's final resting position. Same for moving towards Scope from Flat. At first I just thought the limits need to be adjusted, but it doesn't seem like that would cause this problem. Once the motor reaches the assigned limit, it would not continue to travel when the input were pulsed. I don't believe it's a wiring problem, as the issue happens when I jump the terminals on the control board at the motor. Any ideas?  |  IP: Logged Frank Cox Film God Posts: 2234 From: Melville Saskatchewan Canada Registered: Apr 2011 posted 06-28-2019 03:36 PM                        Any chance that the masking is getting jammed in the track?  |  IP: Logged Sean McKinnon Phenomenal Film Handler Posts: 1712 From: Peabody Massachusetts Registered: Sep 2000 posted 06-29-2019 09:06 AM                        Sounds to me like something is causing the motor to stop even though it is being commanded on. I would measure the output from the controller to make sure that the power to the motor isn't dropping out then I would try to run the motor unloaded and see what happens. My guesses would be 1. Controller failure 2. Motor failure 3. Mechanical problem in the rigging. In that order  |  IP: Logged Steve Moore Expert Film Handler Posts: 211 From: Leeds, West Yorks, UK Registered: Apr 2008 posted 06-29-2019 07:52 PM                     The motors I have encountered, have a piece of threaded rod, driven by a gear/belt from the motor, somewhere near the masking cable flywheel. When the motor turns, so does the threaded rod, which has a lever attached to it, which moves a distance left or right, along the thread and and when it reaches the limit set, this lever touches on a microswitch which cuts the motor. If these motors work the same way, then one of the microswitches could be jammed or something is pressing on the microswitches with each revolution of the motor? The motors I have come across are 40+ years old, with this simple end stop switch. Are modern ones microprocessor controlled now with some counting going on?  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 06-30-2019 03:14 PM                     Yes, they are sorta just adapted Garage Door Openers. Mulones crap was much the same. Check the micro (limit switches) carefully. Switches made today are garbage and short lived because the contacts contain no cadmium. Mark  |  IP: Logged

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