Servotronix CD3E Quick Start Manual page 21

CD3E
4.3.2 Shielding and Bonding
To minimize noise emissions and maximize the immunity levels of the drive system, motor
and feedback cables must be shielded and properly bonded to a grounded surface.
The shield must be connected to ground at both ends of the cable. Its effect is to reduce the
impedance between the cable shield and the back panel.
It is recommended that all shielded cables be bonded to the back panel.
The motor and feedback shielded cables should be exposed as close as possible to the drive.
This exposed cable shield is bonded to the back panel using either non-insulated metallic
cable clamps or cable bonding clamps.
It is recommended to use a star point shield connection with a shielding busbar.
4.3.3 Input Power Filtering
To meet the CE requirements for industrial environments, the electronic system components
in the CD3E require EMI AC line filtering in the input power leads.
Care must be taken to adequately size the system. The type of filter is determined according
to the voltage and current rating of the system and whether the incoming line is single phase
or three phase.
Implementation of the input power filter must adhere to the following guidelines:
Maintain separation of leads entering and exiting the mains filter.
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Filter must be mounted on the same panel as the drive.
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Filter must be mounted as close as possible to the drive, to prevent noise from being
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capacitively coupled into other signal leads and cables.
When mounting the filter to the panel, remove any paint or material covering. Use an
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unpainted metallic back panel, if possible.
Filters are provided with a ground terminal, which must be connected to ground.
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Filters can produce high leakage currents. Filters must be grounded before connecting
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the supply.
Filters should not be touched for 10 seconds after removing the supply.
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4.3.4 Regeneration
When a motor and load decelerate rapidly, kinetic energy of the load drives the motor shaft
energy back to the drive. This regeneration energy must be dissipated or absorbed.
Regenerative energy that is not dissipated is added to the electrical energy already stored in
the capacitors of bus module. If the capacitors can absorb the energy, the system does not
require a regeneration resistor. However, if excessive energy is added, the voltage on the
capacitors will exceed the over-voltage threshold, which then disables the drive.
To prevent over-voltage, and potential damage to the system, excessive regenerative energy
must be dissipated by a regeneration resistor.
If your application requires a regenerative resistor for braking a high inertia load during
emergency stops, connect an external regenerative resistor to terminals C and P on the
Power interface.
Quick Start Guide
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