5.6 Connecting to Ground
Context:
WARNING
LEAKAGE CURRENT HAZARD
Leakage currents exceed 3.5 mA. Failure to ground the drive properly can result in death or serious injury.
-
Ensure the correct grounding of the equipment by a certified electrical installer.
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
(6 AWG) (or 2 rated ground wires terminated separately).
• Tighten the terminals in accordance with the information provided in
9.10 Fastener Torque Ratings.
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).
NOTICE
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
(5 AWG).
Electrical Installation
Operating Guide | VLT® Refrigeration Drive FC 103
AQ275652766279en-000101 / 130R0707
44 | Danfoss A/S © 2020.01
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