Siemens Sinumerik 801 Technical Manual page 19

24VDC power supply
SINUMERIK 801
Start-Up
Notes (for Fig. 2-2):
1) Two phases of U，V，W that are not used by the control transformer;
In order to ensure a good grounding, the cross-sectional area of PE rails
2)
shall be not less than 6mm
Notice
When AC servo drives are used, please connect cables as per requirements
concerned.
The SINUMERIK 801 CNC is supplied by a 24V DC power supply, which
enables the control system to run in order under the voltage range of
24V-15% ... +20%. The excellent quality of the DC power supply is critical for
the stable operation of the control system. You're recommend to select
Siemens 24VDC stabilized power supply (order number: 6EP1333-3BA00). If
a DC power supply other than Siemens is used, please detect the output
waveform generated when the power supply is switched off.
Waveform of Siemens PS
Fig. 2-3 The power supply waveform
If the waveform as shown in the upper right figure occurs, supply the
SINUMERIK 801 in a way as indicated in the figure below and describe the
system power-on sequences in the corresponding user guide for machine
tools. Proper sequences are: switch on the mains for machine tools (to
energize 24VDC power supply and drives) first, then supply the control system
by pressing the button SA1; For switching off the control system, press SA2
first, then power off the mains for the machine tool.
24VDC
24VDC
0VDC
Fig. 2-4 Power on/off sequence of the power supply
Note:
.
2
SA1 SA2
KA1
KA1
Waveform of non-Siemens PS
System operating
volt: 24V min.
KA1
0VDC
CNC
Start-Up
2-3