Siemens Micromaster 420 for EMT 930st ... converting 60Hz to 50Hz . - diyAudio
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Old 22nd December 2010, 03:04 AM   #1
ebxb is offline ebxb  Canada
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Question Siemens Micromaster 420 for EMT 930st ... converting 60Hz to 50Hz .

I have a 50Hz 110v EMT 930st but I'm located in North America which is 60Hz. The platter is turning too fast now. It is not usable.
I don't have the 420 yet. I'm need info. on how it works and how to operate the Micromaster for my EMT. Any info. are welcome.

Thanks...
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Old 22nd December 2010, 05:49 AM   #2
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I guess any 50Hz regenerator will do. 30W will probably be beyond the capabilities of single chip amps but maybe a parallel combination will be capable of driving a step-up transformer. I have no knowledge of your proposed invertor and how clean is its output waveform. It seems it also has the ability to drive directly 3-phase motors which could turn out to be a real improvement for your turntable. It will most certainly be capable of supplying the required voltage and power at 50Hz without any modifications and it appears to be much cheaper than any decent diy solution.
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Old 26th December 2010, 09:36 PM   #3
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The SIEMENS Micromaster series inverters are perfect for your application : I have successfully converted many EMT 930's by using these inverters. Not only will you solve your frequency/speed problem but you'll end up with a much more quiet and stable turntable, which is the greatest upgrade/improvement for the venerable 930.
The 930 has a 3-phase synchronous motor which can be directly driven by the Siemens inverter,and as the speed is frequency dependent you can adjust it with great accuracy on the inverter.(free varispeed bonus !) You no longer need the crude,noisy and instable speed adjusting brake felt/spring assembly and it can (must) be entirely removed. (one less source of noise). Also, the phase shifting network (adjustable resistor and failure-prone capacitor in the motor box) must be discarded and the motor rewired for pure 3-phase delta mode: you'll need 3 wires going directly from the motor to the inverter. (if the platter rotates backwards just reverse any two of the 3 wires) Now,the motor will be driven by a real 3-phase (120) voltage which will make it much quieter and happy (no longer need to play with sthetoscopes to adjust the resistor for minimum motor noise !). The Micromaster has a remote start-stop control input which can be controlled by the EMT turntable Off-Stdby-On microswitch for more convenience. I ususally use a 7-conductor screeened cable between the turntable and the inverter. (3 wires for the motor,2 wires for the remote,2 wires for the AC mains supply back to the inverter). The whole conversion/re-wiring process will take you about 2-3 hours and is fully reversible if you keep all the old parts. Then you will need to program the inverter to optimize the parameters for your motor. This can be a little more tedious as there are many many parameters and 3 levels of programming in the Micromaster. The (optional) control panel/display is of course an absolute must for programming and need to be ordered separately. I can't go into full details about this here. Just let me say it's really worth the effort, once you finished you'll have a better,more stable and quieter EMT 930 than new.
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Old 4th January 2011, 01:04 AM   #4
ebxb is offline ebxb  Canada
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Default How to connect the 420 to the EMT 930ST ?

Great info. but I need some directions on how to connect the 420 to the EMT. I'm not a technical person.

Thanks...
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Old 4th January 2011, 01:12 PM   #5
kevinkr is offline kevinkr  United States
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Here is the getting started manual for the MM420: http://www.watson-marlow.com/pdfs-gl...artedguide.pdf

And here is the manual: http://www.acpd.co.uk/sei/s/1488/f123.pdf

This is a complicated drive, and seems able to do just about anything you can imagine.

I am intrigued and may acquire one of these not too far down the road.

They are very inexpensive compared to any boutique motor controller and I suspect it probably outperforms them with appropriate 3 phase motors.

Note that these seem to require 200 - 240V input power so a special outlet to power the inverter or a step up transformer would be required.
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Last edited by kevinkr; 4th January 2011 at 01:33 PM.
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Old 7th February 2011, 10:54 AM   #6
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I have a problem with micromaster 420. When I conected, I cant see anything on display. Also, coupling noise cant be heard in micromaster. Micromaster is properly fead. What can be? Thank you.
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Old 7th February 2011, 03:06 PM   #7
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Typically you have to have the front panel interface installed, then connect mains power of the proper voltage for that model to at least two of the big screw terminals will get you an error message on the front panel.
If you have a 50 hz 120 VAC appliance, then there are different variable speed drives that will convert 120 60 hz to 120 50 hz. Use the 250 VA version for a turntable. If you have a 240 VAC 50 hz device in the western hemisphere, then you need a 240 vAC variable speed drive and an air conditioner outlet 230 VAC outlet, or a 120-240 transformer. These are sometimes sold as "isolation" transformers a little cheaper than a "power" transformer showing 120-240.
The 120 vAC VSD's are useful for stabilizing pitch on a hammond organ running on generator power.
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Old 10th April 2012, 11:00 AM   #8
g.nicot is offline g.nicot  France
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Hi Tubologic,

Could you set up the Siemens on EMT 930 for me?
If yes, what would be the price for that (including the Siemens part but without shipping)?

Thanks for your answer.

Best regards
Gilles

France
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Old 7th March 2013, 10:59 AM   #9
angcl is offline angcl  Singapore
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how to connect to a single phase motor ? , I am using Lenco L75 , the output got U,V,W for siemens 420 , if single phase motor ,how to connect ?
Thanks

Quote:
Originally Posted by g.nicot View Post
Hi Tubologic,

Could you set up the Siemens on EMT 930 for me?
If yes, what would be the price for that (including the Siemens part but without shipping)?

Thanks for your answer.

Best regards
Gilles

France
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Old 7th March 2013, 11:48 AM   #10
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There are many brands of inverters Siemens IMO is one of the most complicated expensive and charge for all the optional extras

I like Mitsubishi much better and they are much easier to use and control panel is standard Just goggle up single phase inverter and see what you can get near home.

They are built for industrial use and put out a lot of noise and electrical interference
a EMC filter is one of the possible solutions same have an integrated one.

Mitsubishi Electric - Inverters
Here is link from UK supplier
Buy Inverter Drives D720SC Inverter Drive 0.1kW 0.8A 1 Ph Mitsubishi FR-D720S-008SC-EC online from RS for next day delivery.
Just select number of phases and power rating (1 phase from 100 to 180 W came up with 14 results)
At times they give on the products manual the rating of the harmonic currents
Buy Inverter Drives Sinamics G110 inverter w/filter, 0.12kW Siemens 6SL3211-0AB11-2BA1 online from RS for next day delivery.
this has a filter but look at page 70 of manual 13th gives 0.5 amps with fundamental of 1.8 A it will not cost much more of the Mitzi but there is 26 extra for control panel

No Mather which one you get the manuals are all on line and provided you feel safe working with 240 V mains it takes just common sense and patience.

When setting up the inverter you need to know the motor parameters this may be biggest hurdle

Last edited by Bksabath; 7th March 2013 at 11:57 AM.
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