4x4 cnc router

[irving2008]

Hi Guys

thank you all, I'm going for the din rail type of holders (fuse)

so for my motors....
http://www.axiscnc.com/pdfdocs/sy85sth1184208a.pdf

setting these up in unipolar (4.2) i have the 82K +/- 5% 1/4W Resistors which i think is just right for the drivers with the motor settings ?

so am i right in thinking a 12amp fuse! i cant seem to find the trip style of fuse so should i still go with the slow blow 12amp glass fuse ?

my driver specs are here http://www.geckodrive.com/upload/G203V-REV-7-MANUAL.pdf

says something regarding 10amp short circuit trip protection

so would a 10amp fuse be good before it gets to the drive ?

oh i wish i was electrical minded!

The Motors you have are 8 wire...they can only be used in bipolar parallel or bipolar series with those drivers. So you have the choice of running at 6A or at 3A per phase. You can of course run them wired bipolar parallel at a lower current, e.g. 4A if you wanted but the only reason to do that is if your power supply wasnt up to the job. Your PSU is an 11A output. Ideally you'd want one per motor, or at least two in parallel. A single supply is going to limit you to a phase current of about 4.5A - 5A.

These are hi-inductance motors, so wiring them Bipolar Series is going to severely limit torque at speed, so I'd still wire them Bipolar Parallel but run at a reduced current of 4.5A (82k resistors). You can always add a second or third supply later and up the current to 6A.

The Gecko will shut down if you try to draw more than 10A from it. Fuses in the supply to the Geckos are additional protection in case of a catastrophic failure of the Gecko - to prevent wires melting and potential fire. They should be rated at 10 - 12A in this instance.

The other consideration is that the Gecko need a substantial heatsinks for running at 5A - I think you have these and showed a pic of them in another thread?

One word of warning:

80v at 11A is potentially lethal (as is anything above 50v - which is why phone systems are all 50v). Keep hands away and if you have to adjust anything while its switched on always work with one hand in your pocket - that way you stay safe!