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

Electrical Installation

4 Electrical Installation

4.1 Safety Instructions

See 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 screened cables
could result in death or serious injury.
CAUTION
DC CURRENT HAZARD!
A DC current in the protective grounding conductor can
be caused by the frequency converters. When a residual
current-operated protective or monitoring device (RCD/
RCM) is used for protection, only an RCD or RCM of Type
B is allowed.
Over-current Protection
•
Additional protective equipment such as short-
circuit protection or motor thermal protection
between frequency converter and motor is
required for applications with multiple motors.
•
Input fusing is required to provide short-circuit
and over-current protection. If not factory-
supplied, fuses must be provided by the installer.
See maximum fuse ratings in 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 75 °C rated copper wire.
See 8.1 Electrical Data and 8.5 Cable Specifications for
recommended wire sizes and types.

4.2 EMC Compliant Installation

To obtain an EMC compliant installation, follow the
instructions provided in 4.3 Grounding, 4.4 Wiring
Schematic, 4.6 Motor Connection, and 4.8 Control Wiring.
®
VLT AutomationDrive FC 301/302 Operating Instructions

4.3 Grounding

WARNING
LEAKAGE CURRENT HAZARD!
Leakage currents are higher than 3.5 mA. It is the
responsibility of the user or certified electrical installer to
ensure correct grounding of the equipment. Failure to
ground the frequency converter properly could result in
death or serious injury.
For electrical safety
•
•
•
•
•
•
For EMC compliant installation
•
•
•
NOTICE
POTENTIAL EQUALISATION!
Electrical interference risks disturbing the entire instal-
lation, when the ground potential between the
frequency converter and the system is different. To avoid
electrical interference, install equalising cables between
the system components. Recommended cable cross-
section: 16 mm
MG33AN02 - Rev. 2013-09-06
Ground the frequency converter properly in
accordance with applicable standards and
directives.
Use a dedicated ground wire for input power,
motor power and control wiring.
Do not ground one frequency converter 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
ground wires terminated separately).
Establish electrical contact between cable screen
and frequency converter enclosure by using
metal cable glands or by using the clamps
provided on the equipment (see Illustration 4.5
and Illustration 4.6).
Use high-strand wire to reduce electrical
interference.
Do not use pigtails.
2
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4 4
2
(or 2 rated
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