[Yellowhair]

Cheer, thanks for your help.

Best regards

[mactec54]

HI,
OK, then that sound like an adjustable output supply, which is good because thats what you require.

Some supplies such as matec posted can vary the output voltage in response to a 0V-10V DC signal, and has the same effect as the pot. They are great for using a CNC
program like Mach to control the speed of the spindle. Lets hope your new supply either has that or can be modified to do the same.

Craig

Understand what he it is Powering; he has a DC spindle motor, so the 48v supply is a DC motor controller (Not a regular Power Supply) which has the PWM built into the DC Motor Controller.

[Al_The_Man]

One interesting method is using the ex-Treadmill MC2100 control board for the DC motor(s) which range from 2HP to 3.5HP.
The board accepts a PWM control signal which can be supplied from the likes of Mach3 etc direct.
There are also small pot controlled boards that will plug in and use the same method as the OP uss.

[hanermo]

There is nothing wrong with using switch mode power supplies.
Just like using gensets for welding.
One needs about 40% extra nominal capacity, and then there are zero issues.

So a 3 kW welder needs about a 5 kVa genset to run well.
Any 1000 W switch mode power supply will run any typical hobby cnc with steppers under 80V.
This is because the stepper drivers take peak current, for 20 ms +/-, so high voltage drivers can overwhelm a 1000W PSU.
Their actual power usage is typically under 200-300W for 3.

E:
My 750W AC servos, 220V, take peak power of 2 kW, but they do it "softly" via electrical regulation.
This is called soft-start.
Everything lasts longer with soft start and proper electronics.

Typical lifetimes are 10.000 hours at 100 % load 24 x 7, and actual lifetimes are similar, as long as the servo driver electronics are in a cool ventilated cabinet.
Based on 10.000 + units of motor drivers over 20+ years of collective experience.

[Al_The_Man]

The bottom line is, it comes down to personal choice based on one's own experiences.
Plus, manufacturers own recommendations.

[hanermo]

For the OP yellowhair -- it´s harder than You think.

Most stuff 20x40 is not readily upgradeable - the linears.
Better, even vastly better, ac servo drivers will produce much better results, but on a basically weak framework.

One basically needs much better linear guides,
(stiffer supports),
better servos,
and a better controller (higher rate in kHz, typically 500 kHz, or more).

It´s not so much HARD, as it´s relatively expensive and complex.
Each component costs less than 60€.
But it´s 2 each per axis for linears, plus 2 each for mounting steel substrates (20 € each).
x 3 axis.

[hanermo]

Generally, these were ok for old stuff.
Today, spindles can do hard tapping via encoder input.
CSLabs csmio-ips supports this.

HI,
OK, then that sound like an adjustable output supply, which is good because thats what you require.

Some supplies such as matec posted can vary the output voltage in response to a 0V-10V DC signal, and has the same effect as the pot. They are great for using a CNC
program like Mach to control the speed of the spindle. Lets hope your new supply either has that or can be modified to do the same.

Craig

[Yellowhair]

Thank you everyone who helped me get my head around what had happened and how to get over it.
About to re-assemble now having tested the power supply and controllers .:wee:

Many thanks & Best regards

Joe

[mactec54]

There is nothing wrong with using switch mode power supplies.
Just like using gensets for welding.
One needs about 40% extra nominal capacity, and then there are zero issues.

So a 3 kW welder needs about a 5 kVa genset to run well.
Any 1000 W switch mode power supply will run any typical hobby cnc with steppers under 80V.
This is because the stepper drivers take peak current, for 20 ms +/-, so high voltage drivers can overwhelm a 1000W PSU.
Their actual power usage is typically under 200-300W for 3.

E:
My 750W AC servos, 220V, take peak power of 2 kW, but they do it "softly" via electrical regulation.
This is called soft-start.
Everything lasts longer with soft start and proper electronics.

Typical lifetimes are 10.000 hours at 100 % load 24 x 7, and actual lifetimes are similar, as long as the servo driver electronics are in a cool ventilated cabinet.
Based on 10.000 + units of motor drivers over 20+ years of collective experience.

He is controlling a DC Motor so needs a DC motor controller, not a SMPS and yes, there is nothing wrong with a SMPS just use it for the right job.