C N C 4 2 2 0 M a c hi ne Too l Op e ra t ion an d Te st
59
When design the electric cabinet, please reduce the external electrical interference to avoid affecting
the system.
To avoid interference
When the system is designed, we have taken measures to shield space electromagnetism radiation,
absorb impact current, filter power clutter and other measures to avoid interference. It can
prevent the external interference to the system to a certain extent. To ensure that the system
works stably, please take the following measures when install the system:
1: Keep the machine tool away from equipment that may cause interference (e.g. frequency inverter,
AC contactor, static generator, high voltage generator and section device of power lines). At the same
time, connect the switching power supply to the filter separately to improve the interference resistance
of the machine tool (see Fig. 1-4).
2: To supply power for the system through isolation transformer, the machine tool installed with the
system should be grounded, and machine tool and the drive should be connected to separate earth wire
from the connection point.
3: Interference suppression: connect RC loop in parallel on both ends of AC coil (0.01μF, 100~200Ω,
as in Fig. 1-5); approach to inductive load when install RC loop; install reverse parallel freewheeling
diode on both ends of DC coil (Fig. 1-6); connect surge absorber in parallel at the winding end of the
AC motor (Fig. 1-7).
Fig. 1-5
5: To reduce the interference between machine tool signal cable and strong electricity cable, please
follow the rules below for wiring:
Group
Cable type
Wiring requirement
AC power cord
AC coil
A
AC contactor
Bind cables in group A separately from those in
group B and C, keep at least 10cm between
each other, or shield the cables in group A
B
DC coil (24VDC)
Bind cables in group B separately from those in
group A, or shield the cables in group B; keep
Filter
Switching power supply
Surge
absorber
Fig. 1-4
Fig. 1-5
Fig. 1-7
Fig. 16