Installation manual

GEO Direct PWM Amplifiers – Preliminary Documentation
Mounting 15
Bonding
The proper bonding of shielded cables is imperative for minimizing noise emissions and increasing
immunity levels. The bonding effect is to reduce the impedance between the cable shield and the back
panel.
Power input wiring does not require shielding (screening) if the power is fed to the cabinet (enclosure) via
metallized conduit. If metallized conduit is not used in the system, shielded cable is required on the
power input wires along with proper bonding techniques.
Filtering
CE Filtering
The GEO Drive meets the CE Mark standards stated in the front of this manual. Apply proper bonding
and grounding techniques, described earlier in this section, when incorporating EMC noise filtering
components to meet this standard.
Noise currents often occur in two ways. The first is conducted emissions passed through ground loops.
The quality of the system-grounding scheme inversely determines the noise amplitudes in the lines. These
conducted emissions are of a common-mode nature from line-to-neutral (ground). The second is radiated
high-frequency emissions that usually are capacitively coupled from line-to-line and are differential in
nature.
When mounting the filters, make sure the enclosure has an unpainted metallic surface. This allows more
surface area to be in contact with the filter housing and provide a lower impedance path between the
housing and the back plane. The back panel should have a high frequency ground strap connection to the
enclosure frame and earth ground.
Input Power Filtering
Caution
To avoid an electric shock, do not touch filters for at least 10 seconds after
removing the power supply.
The Delta Tau Data Systems, Inc., GEO Drive electronic system components require EMI filtering in the
input power leads to meet the conducted emission requirements for the industrial environment. This
filtering blocks conducted-type emissions from exiting onto the power lines and provides a barrier for
power line EMI.
Adequately size the system. The type of filter must be based on the voltage and current rating of the
system and whether the incoming line is single- or three-phase. One input line filter may be used for
multi-axis control applications. These filters should be mounted as close to the incoming power as
possible so noise is not capacitively coupled into other signal leads and cables. Implement the EMI filter
according to the following guidelines:
• Mount the filter as close as possible to incoming cabinet power.
• When mounting the filter to the panel, remove any paint or material covering. Use an unpainted
metallic back panel, if possible.
• Filters are provided with an ground connection. All ground connections should be tied to earth.
• Filters can produce high leakage currents; they must be grounded before connecting the supply.
• Do not touch filters for a period of 10 seconds after removing the power supply.