Electrical Installation; Safety Instructions; Emc-Compliant Installation; Grounding - Danfoss VLT Midi Drive FC 280 Operating Instructions Manual

Electrical Installation

4 Electrical Installation

4.1 Safety Instructions

See chapter 2 Safety for general safety instructions.
WARNING
4 4
INDUCED VOLTAGE
Induced voltage from output motor cables of different
frequency converters 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.
•
Run output motor cables separately.
•
Use screened cables.
•
Lock out all the frequency converters simulta-
neously.
WARNING
SHOCK HAZARD
The frequency converter can cause a DC current in the
PE conductor and hence result in death or serious injury.
•
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.
Failure to follow the recommendation means that the
RCD cannot provide the intended protection.
Overcurrent protection
•
Extra 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 overcurrent protection. If fuses are not
factory-supplied, the installer must provide them.
See maximum fuse ratings in chapter 9.8 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 chapter 9.5 Cable Specifications for recommended wire
sizes and types.
10
®
VLT Midi Drive FC 280

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

LEAKAGE CURRENT HAZARD
Leakage currents exceed 3.5 mA. Failure to ground the
frequency converter properly could result in death or
serious injury.
•
For electrical safety
•
•
•
•
•
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Danfoss A/S © 11/2015 All rights reserved.
WARNING
Ensure the correct grounding of the equipment
by a certified electrical installer.
Ground the frequency converter 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 (see
Illustration 4.1).
Keep the ground wire connections as short as
possible.
Follow motor manufacturer wiring requirements.
Minimum cable cross-section: 10 mm
(or 2 rated ground wires terminated separately).
2
(7 AWG)
MG07A102