Everest XCR - Product Manual |
Wiring and Connections
INGENIA | 08/04/2019
33
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Safe Torque Off (STO), Brake and Motor Temperature
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9.2. Protective Earth
Connection of Everest XCR Servo Drive and motor housing to Protective Earth (PE)
is required for safety and
Electromagnetic Compatibility (EMC) reasons
.
Electrical faults can electrically charge the housing of the motor or
cabinet, increasing the risk of electrical shocks. A proper connection to PE derives the charge to Earth, activating
the installation safety systems (differential protections) and protecting the users.
Everest XCR Servo Drive provides the following Protective Earth connection points, which are internally connected
and decoupled to power ground:
•
PE terminal in the motor connector P2 pin 4.
• Driver housing
•
Threaded M2.5 assembly holes
•
Pin 20 of feedback connector J1
•
Pin 2 of Inputs / outputs connector J2
A diagram of the recommended Protective Earth wiring is shown following. Special emphasis is placed on the
power wiring.
Some considerations for a proper earth connection are detailed next:
•
Switching noise by the phases is coupled to earth through the housing of the motor. This high-frequency
noise creates common mode current loop between drive and motor. Although the motor housing is
connected to earth through the system chassis, its electrical connection may have a relatively high
impedance and present a big loop. For this reason is essential to reduce the common mode current return
path impedance and its loop area.
Reducing EMI susceptibility
Connecting the drive PE terminals
and cold plate screws
to your system Earth and to the motor
housing solves many noise and EMC problems.
The enclosure of the drive and PE terminals are
decoupled to power ground (supply negative, GND_P) through two Y safety capacitors. This creates a low
impedance
preferential path for coupled common mode noises that otherwise would be coupled to
sensitive electronics like the encoders.
Earth plane reference
While some systems will not have a "real Earth" connection, use your
machine chassis
, the metallic
structure of the device or a good grounding conductive plane as your reference earth.
