Siemens Sinumerik 801 - Installation and Start-Up; Cabinet, Power & Grounding

SINUMERIK 801 2-1
安装调试手册
Installation and Start-Up 2
2.1 Cabinet, Power supply and Grounding
Requirements for
cabinet Machine tool builders need to pay attention to following requirements for a
cabinet:
1) Furnish the cabinet with a cooling or ventilation device; When using an
electric fan to cool the cabinet, mount a dust gauze at the air inlet of the
cabinet;
2) Mount all cabinet components on an unpainted galvanized metal plate;
3) Protection class for cabinet: IP54;
4) Grounding as per China national standard
GB/T5226.1-2002/IEC60204-1
： 2000 Safety of machinery - Electrical
equipment of machines – Part II: General requirements;
5) In the case of poor field grounding, disconnect connections between PE
and neutral (M24) of DC24V power supply and have CNC ungrounded;
6) When CNC is ungrounded, it’s imperative to configure a RS232 terminal
adapter (order number: 6FX2003-0DS00) for RS232 connector to protect
the connector from being broken down;
7) When wiring up the cabinet, AC supply lines (e.g. 85VAC, 220VAC,
380VAC lines and the cable for connecting an inverter to spindle motor)
shall be routed separately from the 24VDC and signal cables;
8) If an inverter is used as spindle drive unit for the machine tool, take
adequate anti-interference measures to protect the cabinet from mains
interference and radio interference, etc;
9) Connect an isolation transformer (i.e. control transformer 380VAC
->220VAC, JBK3-400VA) to the 24VDC power supply for the control
system; Connect a separate isolation transformer to the 85VAC power
supply for stepper drives (i.e. drive transformer 380VAC ->85VAC, JBK3
series); Do not connect the primary side of both transformers to the
same phase of the 380VAC;
10) Have the control transformer ungrounded in the case of poor field
grounding, however, it’s required to connect the 220VAC power supply
for either periphery (e.g. PC/PG) to the control transformer, see Fig.
2-1.
Control transformer Use a separate control transformer in the cabinet to supply the 24VDC
power supply for CNC when Siemens stepper drives are used. Cable
connections with the control transformer are shown in Fig. 2-1.