Electrical Installation; Safety Instructions; Emc-Compliant Installation; Grounding - Danfoss VLT AutomationDrive FC 301 Instruction Manual

Electrical Installation

4 Electrical Installation

4.1 Safety Instructions

See chapter 2 Safety for general safety instructions.
WARNING
INDUCED VOLTAGE
Induced voltage from output motor cables that run
together can charge equipment capacitors even with the
equipment turned off and locked out. Failure to run
output motor cables separately or use shielded cables or
metal conduits could result in death or serious injury.
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run output motor cables separately, or
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use shielded cables or metal conduits
CAUTION
SHOCK HAZARD
The adjustable frequency drive can cause a DC current in
the PE conductor. Failure to follow the recommendation
below means the RCD may not provide the intended
protection.
•
When a residual current-operated protective
device (RCD) is used for protection against
electrical shock, only an RCD of Type B is
permitted on the supply side.
NOTICE!
The adjustable frequency drive is supplied with Class 20
motor overload protection.
Overcurrent protection
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Additional protective equipment, such as short-
circuit protection or motor thermal protection
between adjustable frequency drive and motor, is
required for applications with multiple motors.
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Input fusing is required to provide short circuit
and overcurrent protection. If not factory-
supplied, fuses must be provided by the installer.
See maximum fuse ratings in chapter 8.7 Fuses
and Circuit Breakers.
Wire type and ratings
•
All wiring must comply with local and national
regulations regarding cross-section and ambient
temperature requirements.
•
Power connection wire recommendation:
minimum 167 °F [75 °C] rated copper wire.
MG33AP22
Instruction Manual
See chapter 8.1 Electrical Data and chapter 8.5 Cable Specifi-
cations for recommended wire sizes and types.

4.2 EMC-compliant Installation

To obtain an EMC-compliant installation, follow the
instructions provided in chapter 4.3 Grounding,
chapter 4.4 Wiring Schematic, chapter 4.6 Motor Connection,
and chapter 4.8 Control Wiring.

4.3 Grounding

WARNING
LEAKAGE CURRENT HAZARD
Leakage currents exceed 3.5 mA. Failure to ground the
adjustable frequency drive properly could result in death
or serious injury.
•
For electrical safety
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For EMC-compliant installation
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Danfoss A/S © Rev. 09/2014 All rights reserved.
Ensure the correct grounding of the equipment
by a certified electrical installer.
Ground the adjustable frequency drive in
accordance with applicable standards and
directives.
Use a dedicated ground wire for input power,
motor power, and control wiring.
Do not ground one adjustable frequency drive to
another in a "daisy chain" fashion.
Keep the ground wire connections as short as
possible.
Follow the motor manufacturer wiring
requirements.
Minimum cable cross-section: AWG 7 [10 mm
(or two rated ground wires terminated
separately).
Establish electrical contact between the cable
shield and the adjustable frequency drive
enclosure by using metal cable connectors or by
using the clamps provided on the equipment (see
chapter 4.6 Motor Connection).
Use high-strand wire to reduce electrical
interference.
Do not use pigtails.
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