Siemens Sinumerik 801 - Page 19

Start-Up
SINUMERIK 801 2-3
Start-Up
Notes (for Fig. 2-2):
1) Two phases of U，V，W that are not used by the control transformer;
2) In order to ensure a good grounding, the cross-sectional area of PE rails
shall be not less than 6mm
2
.
Notice
When AC servo drives are used, please connect cables as per requirements
concerned.
24VDC power supply
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.
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.
0VDC
24VDC
KA1
CNC
0VDC
KA1SA2SA1
24VDC
KA1
Fig. 2-4 Power on/off sequence of the power supply
Note:
W
ave
f
orm o
f
Si
emens
PS
W
ave
f
orm o
f
non-
Si
emens
PS
S
ys
t
em opera
ti
ng
vo
lt
:
24V
m
i
n.