5.3.2 Electrical Installation
Structure
of
the
Electrical
Panel
with
the
Components
of
a
Servo
System
Particular attention should be given to grounding, shielding and the use of the filter to reduce or
suppress particularly steep voltage surges (derived by PWM modulation), which are capable of
generating significant unwanted currents through capacitive couplings and grounded systems. These
voltage surges can also generate high-frequency radiation mainly through the motor cable. Filters can
be installed to reduce conducted disturbances; see Power Line Filters on page 47 for the
recommended models.
Regarding the grounding in the panels, there are typically two types of problems:
PN: L-MAM2-E-201
Moog Casella DM2020 Installation and Startup Guide
5.3.2 Electrical Installation
l
EMC Ground (high frequency) using unpainted areas of the metal panel, where the drives and
the filters are positioned, to create an adequate electrical contact for the mitigation of high
frequency noise.
l
Safety Ground (PE = protective earth) according to standard EN 60204-1, to be performed with
a minimum wire cross section of 10 mm
2
.
Regarding the shielding, all power and control cables must be shielded except those from the mains to
the EMC filter, as its separate shielding is connected to the body of the electrical panel and
consequently does not require further protection.
Generally, the shield must be connected at each end. In some cases, however, the control cable shield
can only be connected at one end to clear the noise that might interfere with the control signal.
Requirements for laying the connecting cables:
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