Messages

91

General Mach Discussion / Re: CS Labs CSMIO/P-A

« on: August 13, 2018, 03:03:36 AM »

Hi All
Need to get a EMI filter for the drives I've ordered.
The motors are BCH2LF073
The spec say 4amp continuous and 13amp rms.
What ampage does the filter need to be?
Can I use one filter for the two drives?

Cheers Again
Mick

92

General Mach Discussion / Re: CS Labs CSMIO/P-A

« on: August 09, 2018, 04:24:13 PM »

Thanks Craig

That's a huge jump by just fitting a Line Reactor. Never heard of one but just been reading up on improving power factor. Interesting stuff, wished I fully understood it.

By the way, the phase converter is 5.5kw. Max single motor size 7.5hp.

There is an Amp meter built into the line side of the converter. Not sure if you noticed.

Mick   

93

General Mach Discussion / Re: CS Labs CSMIO/P-A

« on: August 08, 2018, 09:54:47 AM »

Hi Craig

I am trying to achieve two things. One was to have everything running off single phase and two was to turn the spindle axis into a controllable C axis. The lathe can potentially do a lot more with a C axis.

No, I am not thinking of selling it but if and when I do it would be more saleable.

I think its clear that using single phase is not going to be an option for the spindle and after further thoughts and following all your comments, it makes sense to use a larger motor and not restrict what the machine is capable of.  

I have ordered the 750w motors and drives for the X and Z axis, absolute bargain at £718.00 with all the cables. Delivery is 16th August.

Thanks for your input on this again.

Cheers
Mick

94

General Mach Discussion / Re: CS Labs CSMIO/P-A

« on: August 08, 2018, 01:31:38 AM »

Cheers Craig will have a look.

Hi All

Is this motor worth looking at?

https://www.schneider-electric.com/en/product/BMH1401P37A1A/servo-motor-bmh---10.3-nm---4000-rpm---keyed-shaft---without-brake---ip65-ip67/

On single-phase up to 1500 rpm has 9.9nm then drops to 7 as opposed to the DDM's 7.9nm at 2000rpm. Over that, it drops significantly.

It also has a lot higher peak torque of around 32nm.

If it proved to struggle around 2000rpm or I needed more rpm, I could change the drive to a three-phase 440v giving higher torque values than the DDM that I think we have suggested will be sufficient.

Cheers
Mick

 

95

General Mach Discussion / Re: CS Labs CSMIO/P-A

« on: August 07, 2018, 05:01:02 PM »

Hi

Does anyone have a spindle torque calculator to hand? Where I can input stock diameter, material, feed rates etc. Going round in circles on the net.

Cheers 

96

General Mach Discussion / Re: CS Labs CSMIO/P-A

« on: August 07, 2018, 01:54:31 PM »

Hi Craig

Cheers for the info. did think it was a bit strange for everyone to have to use step down transformers. Will check them out.

Mick

97

General Mach Discussion / Re: CS Labs CSMIO/P-A

« on: August 07, 2018, 01:11:07 AM »

Hi Craig

Thank you.

The other thing I would need to buy is 3 phase step down transformer. The 3 phase drives are 220v 3 phase and the converter puts out 430v.

Cheers
Mick 

 

98

General Mach Discussion / Re: CS Labs CSMIO/P-A

« on: August 06, 2018, 03:38:25 PM »

Hi Craig
Thank you for the detailed explanation but I am more confused now. Can we check the amp draw via a clamp amp meter using my existing motor to confirm the draw and not be guessing power factors and everything else that's drawing power?

Cheers
Mick

99

General Mach Discussion / Re: CS Labs CSMIO/P-A

« on: August 06, 2018, 01:43:47 PM »

Hi Craig

Thank for taking the time on this. This is definitely something which needs checking prior to going for the Servo Spindle. We run an 8kw heat pump which gets used a lot through the winter. Excuse me for being thick but can you please explain a little more. I apologise if you have already covered this.

the first motor:

power =2600 X 2 X PI / 60 X 19
          =5172 W

the second:
power = 3000 X 2 X PI / 60 X 14
          =4397 W

I don't understand why we are getting 4397w when the motor is rated at 3000w

The motor on the lathe at the moment is 6kw at 65HZ at 1950 rpm at 15A according to the plate. Can we run this motor at full speed and use a clamp meter to check the amp draw. Taking away assumptions of the power factors. Then work back from this with the servo motor ratings?     

Cheers
Mick

100

General Mach Discussion / Re: CS Labs CSMIO/P-A

« on: August 06, 2018, 03:09:25 AM »

I need to speak to SMP as there website is no longer showing these converters. Don't want to spend the money on the 3 phase spindle then have a problem with the converter and not be able to get it repaired.
Cheers