Everest XCR - Product manual |
Wiring and Connections
INGENIA | 2020-10-01 00:04:38
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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. Please see this technical note to
understand why this is important:
Electromagnetic Interference Issues With Servo Drive Systems
.
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
The protective earthing conductor must have an area equal or superior to the power cables and always no less than
2.5 mm². Respect the green-yellow color code for PE. Connections must always be done using non-corrosive
bonding points. A diagram of the recommended Protective Earth wiring is shown following.
Some considerations for a proper earth connection are detailed next:
Connecting PE to GND_P near the power supply can provide an advantage for EMC and electrical safety by
keeping a low voltage. Dis can only be done when the drive is powered with an isolated power supply or
battery. This action, however sometimes can create unwanted effects such as added common mode noise or
electrical safety issues depending on the whole installation layout.
Switching noise by the phases is coupled to earth through the housing of the motor. This high-frequency
noise creates a 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
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 1 nF 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.
