[Jackal66]

On my Hurco KM3P, the info for the motors says rated at 90VDC @ 12 amps continuous & 20 amps peak.

While looking at the schematic for the air powered items, I noticed the transformer that feeds the servo power says 60volts output. Is there some kind of booster or capacitor/amp that brings it up to 90 volts?


If this is what is going to the servo motors, that means I could use a servo amp that is rated at 80 volts & 20 amps.< Is this correct?

The amps I ordered (160 volts & 35 amps), have been back-ordered for over a month.

If the 80 volts & 20 amp would work, I could get started right now.

These smaller amps have an optional *braking resistor* for when the servo coasts down and generates higher voltage.

Also the smaller amps are $70 each cheaper .

Thanks for the help,

JAckal

PS: If anyone wants to see the schematic I am referencing to, I will post a scan of it.

[bloke]

Once the 60v AC is fully rectified and smoothed with a capacitor, the voltage will be higher than the average of the AC voltage by a factor of 1.414
The 60v AC will become 60 x 1.414 = 84.84 vDC

[Jackal66]

Thanks bloke,

You are good!!!

JAckal

[SHAILESHSHEOREY]

Hi Bloke,
I have Hurco km3p CNC knee mill .I tried to start it in manual mode just to see axis jog etc. I followed startup routine like
Manual mode
Power
Reset servos (soft key)
Start
A small pulse of Humm for a second and nothing else happens.
I could see note at bottom of left screen saying no power to servos press axis jog and then start.
Please help me in the matter .what would be the problem.
Regards,
Shailesh sheorey

[Al_The_Man]

Ideally the power supply voltage for a servo in a motion control should be at least 10% above the motor rated voltage in order to obtain maximum results from the motor, of course the drive has to be able to handle the voltage supplied.
Al.

[scrambled]

Are you sure the air is turned on?

Check the overloads on the motor contacter

Steve


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