2HSS86H Driver... AC or DC PSU?

[JW1977]

Hi!

I’m currently in "PSU build mode".
My drivers (JMC 2HSS86H) can be run with 24-70V DC or 30-100V AC.

Whats the pros and cons by running them on AC?
Would the PSU look the same, with capacitors but without the rectifier?

I´ve got 4 drivers and 4 motors. 3 Nm Hybrid, 1,8 mH, slaved Y-axis.
Working plan resulted in components that would give the drivers 48V and a 600-700 W PSU.

Would it be a mistake running 2 switched PSU´s of 350W each instead of a DIY Thoroidal PSU?
It’s cheaper but how about ripple and back current?

Thanks
/J

[Clive S]

Hi!

I’m currently in "PSU build mode".
My drivers (JMC 2HSS86H) can be run with 24-70V DC or 30-100V AC.

Whats the pros and cons by running them on AC?
Would the PSU look the same, with capacitors but without the rectifier?

I´ve got 4 drivers and 4 motors. 3 Nm Hybrid, 1,8 mH, slaved Y-axis.
Working plan resulted in components that would give the drivers 48V and a 600-700 W PSU.

Would it be a mistake running 2 switched PSU´s of 350W each instead of a DIY Thoroidal PSU?
It’s cheaper but how about ripple and back current?

Thanks
/J

Re the AC input 3-100 you would not use caps just a transformer with a secondary of about 7--80 v

If you want to go down the DC route then a toroidal power supply is a better choice using a 22-0-22 secondary would give you about 62V DC when rectified with caps.

[JW1977]

But if i choose to go AC there will not be any capacitors handling the back EMF from the motors right?

[Clive S]

But if i choose to go AC there will not be any capacitors handling the back EMF from the motors right?

The caps are in the drives. You can't put caps on the transformer without the rectifier before them.

edit

My drivers (JMC 2HSS86H) can be run with 24-70V DC or 30-100V AC.

Are you sure you have this the correct way round

[JW1977]

This is from the manual but im still leaning towards going DC.
After all, its quite fun building the PSU...

[Clive S]

This is from the manual but im still leaning towards going DC.
After all, its quite fun building the PSU...

So yes you had it the wrong way round. I would up the toroidal transformer to 25- 0 - 25 which would give you about 70v dc when rectified . good vid here. https://www.youtube.com/watch?v=4OoQ...zD30sZjtp_VyqY