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on the drive and
parameter 14-50 RFI Filter
on the filter. For more detail, see IEC 364-3. In the
[Off]
position, the filter capacitors be-
tween the chassis and the DC link are cut off to avoid damage to the DC link and to reduce the ground capacity currents, according
to IEC 61800-3.
If optimum EMC performance is needed, or parallel motors are connected, or the motor cable length is above 25 m (82 ft), Danfoss
recommends setting
parameter 14-50 RFI Filter
to
[On]
. It is important to use isolation monitors that are rated for use together with
power electronics (IEC 61557-8).
6.8 Mains and Motor Connection
6.8.1 Introduction
The drive is designed to operate all standard 3-phase asynchronous motors.
Use a shielded/armored motor cable to comply with EMC emission specifications and connect this cable to both the decoupling
plate and the motor.
Keep the motor cable as short as possible to reduce the noise level and leakage currents.
For further details on mounting the decoupling plate, see the
Decoupling Plate Mounting Instructions
.
Also see EMC-Correct Installation in the
6.3 EMC-compliant Electrical Installation
6.8.2 Connecting to the Ground
W A R N I N G
LEAKAGE CURRENT HAZARD
Leakage currents exceed 3.5 mA. Failure to ground the drive properly can result in death or serious injury.
Ensure that the minimum size of the ground conductor complies with the local safety regulations for high touch current
equipment.
For electrical safety:
Ground the drive in accordance with applicable standards and directives.
Use a dedicated ground wire for input power, motor power, and control wiring.
Do not ground 1 drive to another in a daisy chain fashion.
Keep the ground wire connections as short as possible.
Follow motor manufacturer wiring requirements.
Minimum cable cross-section: 10 mm
2
(8 AWG) Cu or 16 mm
2
(6 AWG) Al (or 2 rated ground wires terminated separately).
Tighten the terminals in accordance with the information provided in
6.6 Fastener Tightening Torques
For EMC-compliant installation
Establish electrical contact between the cable shield and the drive enclosure by using metal cable glands or by using the clamps
provided on the equipment.
Reduce burst transient by using high-strand wire.
Do not use twisted shield ends (pigtails).
N O T I C E
POTENTIAL EQUALIZATION
There is a risk of burst transient when the ground potential between the drive and the control system is different.
Install equalizing cables between the system components. Recommended cable cross-section: 16 mm
2
(6 AWG).
AJ363928382091en-000101 / 130R0983
72 | Danfoss A/S © 2021.04
Electrical Installation
Considerations
VLT® Flow Drive FC 111
Design Guide