Danfoss VLT AutomationDrive FC 360 Quick Manual page 20

Installation
4.2.1 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.
4 4
Installation, start up, and maintenance must be
performed only 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 screened
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 overload protection.
Wire type and ratings
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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 chapter 8 Specifications for recommended
wire sizes.
4.2.2 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 manual. Ground currents are higher
than 3.5 mA. Failure to ground the frequency converter
properly could result in death or serious injury.
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VLT AutomationDrive FC 360
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Illustration 4.3 Grounding Principle
4.2.3 Mains, Motor, and Ground
INDUCED VOLTAGE!
Run output motor cables from multiple frequency
converters separately. Induced voltage from output
motor cables run together can charge equipment
capacitors even when the equipment is turned off and
locked out. Failure to run output motor cables separately
could result in death or serious injury.
Grounding clamps are provided for motor wiring (see
Illustration 4.4).
Danfoss A/S © 04/2015 All rights reserved.
Establish proper protective grounding for
equipment with ground currents higher than 3.5
mA must be established.
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 Illustration 4.3).
Keep the ground wire connections as short as
possible.
Use high-strand wire to reduce electrical noise.
Follow motor manufacturer wiring requirements.
FC 1 FC 2
PE
FC 1 FC 2
PE
Connections
WARNING
FC 3
FC 3
MG06A602