User manual
3U Servo Amplifier
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 enclosure via metal
conduit. If metal conduit is not used in the system, shielded cable is required on the power input wires
along with proper bonding techniques.
Filtering
CE Filtering
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 provides 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 electric shock, do not touch filters for at least 10 seconds after removing the
power supply.
The 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 the incoming cabinet power. •
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When mounting the filter to the panel, remove any paint or material covering. Use an unpainted
metallic back panel.
Filters are provided with a ground connection. All ground connections should be tied to ground.
Filters can produce high leakage currents; they must be grounded before connecting the supply.
Do not touch filters for a period of ten seconds after removing the power supply.
Motor Line Filtering
Motor filtering may not be necessary for CE compliance of Geo Drives. However, this additional
filtering increases the reliability of the system. Poor non-metallic enclosure surfaces and lengthy,
unbonded (or unshielded) motor cables that couple noise line-to-line (differential) are some of the factors
that may lead to the necessity of motor lead filtering.
Backplane Board 18