Siemens Sinumerik 801 Technical Manual page 18

Start-Up
Drive transformer
2-2
U V W
380VAC
1)
4)
3)
PE
Fig. 2-1 Connecting the control transformer
Notes (for Fig. 2-1):
1) Two phases of U，V，W that are not used by the drive transformer;
2) Connections can not be made until PE rails are found well grounded.
3) In order to ensure a good grounding, the cross-sectional area of PE rails
shall be not less than 6mm
Notice
The control transformer will not be provided by Siemens. Customer may
order it from other sources.
Use a separate drive transformer in the cabinet to supply the 85VAC power
supply for stepper drives. Connections with the drive transformer are shown
in Fig. 2-2.
Fig. 2-2 Connecting the drive transformer
220VAC
L
220/24 DC
Power
Supply
0V
PE
N PE
3) 2,3)
2
.
220VAC
24V
L+
L+
CNC
0V
M
M
0V
PE
3) 3)
PE rails
PE rails
SINUMERIK 801
L
PC
N PE
3)
Start-Up