Hello,
I'd like to power 3 steppers motors FL86STH80-4208A (4 phases, 4.2 A per phase), datasheet attached. I will only use 2 steppers in the near future, but would like to be able to add a third later. The wiring I am using at the moment is bipolar (parallel) connection... The steppers will be used for relatively light work (for example a sand plotter as shown by Bruce Shapiro), maybe a small mill.
I think my steppers are well over specs for my actual needs, but I have two of them and would like to avoid buying more steppers.
My question is about the power supply I need and the amp rating of the drivers (datasheet attached) ... my online seller first told me that a 36V 10A power supply and 4.2 A (max) drivers were fine for this, ... Is this right?
From the specs of the stepper in parallel connection I apparently need 6A (4.2 * 1.4) A ... so it looks like 6 * 3 = 18A. So my power supply looks too small
As for the drivers the max amperage is 4.2A - this again looks under-powered if I use the stepper in parallel connection...
Now the seller is okay swapping my drivers (at a cost) for drivers that can handle up to 7.2A (
http://www.ebay.co.uk/itm/CNC-Mill-Router-DIY-Stepper-Driver-Board-Controller-MA860H-2-6A-7-2A-24V-110V-DC-/270917084995)
Should I do this, and also get a new power supply? What power supply would you recommend?
many thanks
Thomas