TOMATECH AUTOMATION
See Appendix Ⅰ, Ⅱ.
1.2.2 Preconditions of the cabinet installation
� The dust, cooling liquid and organic resolution should be effectively prevented from
entering the
cabinet;
� The designed distance between the CNC back cover and the cabinet should be not less
than
20cm, the inside and outside temperature difference of the cabinet should be not more
than 10℃
when the cabinet inside temperature rises;
� Fans can be fixed in the cabinet to ventilate it;
� The panel should be installed in a place where the cooling can’t splash;
� The external electrical interference should be taken into consideration in cabinet design
to
prevent it from interfering the CNC system.
1.2.3 Measures against interference
In order to insure the CNC stable working, the anti-interference technology such as space
electromagnetic radiation shielding, impact current absorbing, power mixed wave filtering
are
employed in CNC design. And the following measures are necessary during CNC
connection:
1. Make CNC far from the interference devices (inverter, AC contactor, static generator,
high-voltage generator and powered sectional devices etc.);
2. To supply the CNC via an isolation transformer, the machine with the CNC system
should be
grounded, the CNC and drive unit should be connected with independent grounding wires
at
the grounding point;
3. To inhibit interference: connect parallel RC circuit at both ends of AC winding (Fig.
1-3a), RC
circuit should approach to inductive loading as close as possible; reversely connect
parallel
freewheeling diode at both ends of DC winding (Fig. 1-3b); connect parallel surge
absorber at
the ends of AC motor winding (Fig. 1-3c);
Chapter 1 Installation Layout
309
Ⅲ Connection
a) b) c)
Fig. 1-3
4. The CNC leadout cables use the twisted shield cable or shield cable, the cable shield
tier is
grounded by an terminal at CNC side, signal cable should be as short as possible;
5. To reduce the mutual interference among the CNC signal cables, and among the strong
To Next Page
Loading...
Need help?
General