Help with plasma controller build

[Clive S]

I couldn't fault the leadshines to be fair I just thought I'd get the geckos as there is so much info on them so I now have 4
the leadshine may come in handy for another project, just wanna get the plasma working
the Psu from zapp only has 3 outputs
yes I have two motors on 1 axis and yes I'm sure the pdmx supports slaving

doing some research and it looks like for these motors 62v is the right Psu
is this correct?

I think you will find that all the outputs are connected together so you can just connect two to one of the outputs.
If you read the Gecko manual it says that the motor voltage can be up to 20 time the rated voltage on the motor ie. 75.6V

[Lewywri89]

I found this calculation online saying
take the square root of the motor inductance which is 3.8mh
times it by 32 and this is the voltage
is this the wrong way to calculate?
thanks again for the help

the pmdx 126 can only be slaved if used with pmdx 134 I think

[Clive S]

I found this calculation online saying
take the square root of the motor inductance which is 3.8mh
times it by 32 and this is the voltage
is this the wrong way to calculate?
thanks again for the help

the pmdx 126 can only be slaved if used with pmdx 134 I think

Well you are using Gecko drives so why not take their figures? I take it you are using nema 23's motors, It will run fine with 62V but you will get better performance with a little extra.

I don't see in the manual re the 134 slaving it just looks like a breakout board for the gecko.

[Lewywri89]

An axis can be cloned but the direction of the clone is the opposite directionso phases need switching

[Clive S]

An axis can be cloned but the direction of the clone is the opposite directionso phases need switching

Ok if you are happy BUT can you home them individually to square the gantry!!!

[Lewywri89]

Ok if you are happy BUT can you home them individually to square the gantry!!!

Asked pmdx direct And got Instant replies as I wasn't 100% on slaving and squaring

[m_c]

I think you will find that all the outputs are connected together so you can just connect two to one of the outputs.
If you read the Gecko manual it says that the motor voltage can be up to 20 time the rated voltage on the motor ie. 75.6V

The 20 times motor voltage is a very rough guide for maximum voltage. If the motor inductance is known, the sqrt of the inductance times 32 is a more accurate voltage.

Gecko cover it in the power supply section of their stepper motor basics guide - http://www.geckodrive.com/support.html

[Lewywri89]

So 60v - 62v would be the correct size psu? If I use 68v I assume I would have unwanted motor heat?
is anyone in the north west able to make a psu for me for a fee
cant find enough info to buy the parts and build myself
would like a linear psu to minimize electrical noise
Also what amp psu would be sufficient
thanks again
lewis

[paulus.v]

So 60v - 62v would be the correct size psu? If I use 68v I assume I would have unwanted motor heat?
is anyone in the north west able to make a psu for me for a fee
cant find enough info to buy the parts and build myself
would like a linear psu to minimize electrical noise
Also what amp psu would be sufficient
thanks again
lewis

It is not that hard to build your PSU. you only need a toroidal transformer, a bridge rectifier, a capacitor and fuse(s) if you want to be on the safer side.

I would go with a 45V 500VA toroid (or 625VA max.) but here you may find different answers as there is not a generally accepted formula to calculate the power you need.

[Clive S]

It is not that hard to build your PSU. you only need a toroidal transformer, a bridge rectifier, a capacitor and fuse(s) if you want to be on the safer side.

I would go with a 45V 500VA toroid (or 625VA max.) but here you may find different answers as there is not a generally accepted formula to calculate the power you need.

I think you have it spot on and they can all be purchased here http://www.rapidonline.com/electronic-components