Back to rchobby main page             Mini lathe SD300 - Conversion

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This page describes the conversion of lathe SD300 made by Proxxon from single phase alternating current motor to three-phase A.C. motor with frequency converter.
 

All you need is:
- V-belt pulley, hole diameter = 11 mm
-
three-phase A.C. motor
- contactor
- relay
- frequency converter

 

 
The new circuit diagram
The new frequency converter transforms 1 x 230 V to 3 x 230 V. My aim was to retain the old operation system unchanged. Therefore it was necessary to add a contactor and a relay. So it is also possible to use this machine without a
frequency converter, but it needs a direct connection to the three-phase power system.

You don't need a relay, if you toggle the direction of the spindle at the frequency converter.

 

  Click for a larger picture
     
View into the machine without control system

The old control system has been removed.
 
     
The new construction units:
- contactor 230 V
- relay 230 V
 
     
View from bottom-up
On the left side you can see the contactor.
The relay is under the sub plate.
 
     
The new electric motor
 
   
Type:  DAS 63SX2-A1DB/9;5W46
 
Technical Data: 230/400 V;50Hz; 0,25kW, 2.800 U/min.,IP54, WKL FT9356,B3, isolation of phase
 

design of cable:
wire 300 mm long without varnishing

   
Manufacturer:   

   
EMC Grünhain GmbH & Co. KG
Bahnhofstraße 17
08358 Grünhain
phone: +49 3774 523-0
online: http://www.emgr.de
(also in english)

 
     
Frequency converter
Siemens Micromaster Vector
Type MMV55/2,
208/240V +-10%,
47-63Hz,
0-650Hz,
Siemens part-nr. 6SE3212-8CA40
 
     
Side view  
     
View from behind the motor
The
three-phase A.C. motor is much shorter than the original motor due to the fact that there is no contactor of the centrifugal force.
 
     
Source: http://www.emgr.de/uk/norm_dreh_motorabmess.htm
 
What does that costs?
Siemens Micromaster Vector
motor
v-belt pulley
relais and contactor
 
appr. 70,00 EUR (ebay)
appr. 85,00 EUR (EMC Grünhain)
appr. 10,00 EUR (UNITECH)
appr. 20,00 EUR (Conrad)

all prices incl. shipping costs for germany


 

   IEC: A AB AD B C D
k6
E GA H HD K L LC
DAS 63S, SX 100  120  94 (104) 80  40  11 14 23 30 12,5 16,0 63  157 (167) 7  178 185 207 221