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Tech Head - The Technology Section
The Work Bench and Soldering Station
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<blockquote data-quote="Vipersan" data-source="post: 914106" data-attributes="member: 325666"><p>So ..put pen to paper and traced the Gbox motor control schematic ...insofar as it is relevant to back emf and transients.</p><p>TBH it looks ok ...but only a single 100nf cap used accross the contacts ...</p><p>no series resistor ....(snubber)</p><p>but a 100nf cap and varistor across the motor contacts ..M+ and M-</p><p>A 470uf cap decoupling the motor supply</p><p>There is no series current limiting resistor from what was the bridge rectifier to the relay contacts</p><p>Perhaps I should add one ? ...but it will get a bit hot I suspect</p><p></p><p>Keep in mind also that there is a second Gbox pcb in parallel on the 24v line...</p><p>thus you can increase the relay contact cap to 200nf ...and the decoupling electrolytic to 1000 uf +</p><p>anyway..</p><p>I've done enough staring at the pcb tonight..</p><p></p><p>suggestions for any improvements are most welcome..</p><p><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p>rgds</p><p>VS</p></blockquote><p></p>
[QUOTE="Vipersan, post: 914106, member: 325666"] So ..put pen to paper and traced the Gbox motor control schematic ...insofar as it is relevant to back emf and transients. TBH it looks ok ...but only a single 100nf cap used accross the contacts ... no series resistor ....(snubber) but a 100nf cap and varistor across the motor contacts ..M+ and M- A 470uf cap decoupling the motor supply There is no series current limiting resistor from what was the bridge rectifier to the relay contacts Perhaps I should add one ? ...but it will get a bit hot I suspect Keep in mind also that there is a second Gbox pcb in parallel on the 24v line... thus you can increase the relay contact cap to 200nf ...and the decoupling electrolytic to 1000 uf + anyway.. I've done enough staring at the pcb tonight.. suggestions for any improvements are most welcome.. :D rgds VS [/QUOTE]
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Tech Head - The Technology Section
The Work Bench and Soldering Station
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