2.2.1 General Requirements
WARNING
EQUIPMENT HAZARD!
Rotating shafts and electrical equipment can be
hazardous. It is important 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 3
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.
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
for recommended
wire sizes.
2.2.2 Grounding Requirements
WARNING
GROUNDING HAZARD!
For operator safety, a certified electrical installer should
ground the frequency converter 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.
•
Establish proper protective grounding for
equipment with ground currents higher than 3.5
mA must be established. See
for details.
•
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 1 frequency converter to another
in a “daisy chain” fashion (see
•
Keep the ground wire connections as short as
possible.
•
Use high-strand wire to reduce electrical noise.
•
Follow motor manufacturer wiring requirements.
130BC500.10
FC 1
FC 1
FC 2
FC 2
FC 3
FC 3
PE
PE
Illustration 2.3 Grounding Principle
Product Overview
Design Guide
14
Danfoss A/S © 09/2014 All rights reserved.
MG06B402
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