Advertisement
3.2
Magnetic Coil Noise
In the case of DC coils, a diode is installed across the coil in a direction that will cause
the voltage transient to be dissipated through the diode.
Figure 3.1 DC Coil Suppression
In the case of AC coils, a capacitor and resistor are installed across the coil to suppress
the unwanted transients.
Figure 3.2 AC Coil Suppression
3.3
Grounding
The GND terminal of the drive is bonded to the frame and the mounting tabs. There are
two acceptable methods for connecting the grounds of the enclosure and other
electrical equipment to the Earth ground. Figure 3.3 shows the ideal grounding method
providing a grounding point isolated from the enclosure and ground all the electrical
equipment to this one point. From there, a grounding wire with good conductivity will be
run to the enclosure cabinet ground point. The machine ground wire and earth ground
supply wire are connected to this enclosure ground point. This method provides
maximum isolation of the control and servo grounds from the machine and other
sources of ground imbalances and noise. In most cases however, a single point
enclosure ground can be used as shown in Figure 3.5.
Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com
Section 3– Page 2
Advertisement
