General Requirements; Earth (Grounding) Requirements; Leakage Current (>3,5 Ma) - Danfoss VLTAutomationDrive FC 360 Quick Manual

Installation

3.2.1 General Requirements

WARNING
EQUIPMENT HAZARD!
Rotating shafts and electrical equipment can be hazardous.
Extreme care should be taken to protect against electrical
hazards when applying power to the unit. All electrical
work must conform to national and local electrical codes
and installation, start up, and maintenance should only be
performed by trained and qualified personnel. Failure to
follow these guidelines could result in death or serious
injury.
CAUTION
WIRING ISOLATION!
Run input power, motor wiring and control wiring in three
separate metallic conduits or use separated shielded cable
for high frequency noise isolation. Failure to isolate power,
motor and control wiring could result in less than
optimum frequency converter and associated equipment
performance.
Run motor cables from multiple frequency converters
separately. Induced voltage from output motor cables run
together can charge equipment capacitors even with the
equipment turned off and locked out.
•
An electronically activated function within the
frequency converter provides overload protection
for the motor. The overload provides Class 20
motor protection. See 6 Warnings and Alarms for
details on the trip function.
Wire Type and Ratings
•
All wiring must comply with local and national
regulations regarding cross-section and ambient
temperature requirements.
•
Danfoss recommends that all power connections
be made with a minimum 75° C rated copper
wire.
•
See 8 Specifications for recommended wire sizes.

3.2.2 Earth (Grounding) Requirements

WARNING
GROUNDING HAZARD!
For operator safety, it is important to ground the
frequency converter properly by a certified electrical
installer in accordance with national and local electrical
codes as well as instructions contained within this
document. Ground currents are higher than 3,5 mA. Failure
to ground the frequency converter properly could result in
death or serious injury.
®
VLT AutomationDrive FC 360 Quick Guide
Illustration 3.3 Grounding Principle
3.2.2.1 Leakage Current (>3,5 mA)
Follow national and local codes regarding protective
earthing of equipment with a leakage current > 3,5 mA.
The earth leakage current depends on various system
configurations including RFI filtering, screened motor
cables, and frequency converter power.
EN/IEC61800-5-1 (Power Drive System Product Standard)
requires special care if the leakage current exceeds 3,5 mA.
Earth grounding must be reinforced in one of the
following ways:
®
MG06A102 - VLT is a registered Danfoss trademark
•
Proper protective grounding for equipment with
ground currents higher than 3,5 mA must be
established, see Leakage Current (>3,5 mA)
•
A dedicated ground wire is required for input
power, motor power and control wiring
•
Use the clamps provided with the equipment for
proper ground connections
•
Do not ground one frequency converter to
another in a "daisy chain" fashion (see
Illustration 3.3)
•
Keep the ground wire connections as short as
possible
•
Using high-strand wire to reduce electrical noise
is recommended
•
Follow motor manufacturer wiring requirements
FC 1 FC 2
PE
FC 1 FC 2
PE
3
FC 3
FC 3
13
3