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 o and locked out. Failure to run
output motor cables separately or to use shielded cables
could result in death or serious injury.
•
Run output motor cables separately, or
•
Use shielded cables.
CAUTION
SHOCK HAZARD
The frequency converter can cause a DC current in the
PE conductor. Failure to follow the recommendation may
lead to the RCD not providing 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
allowed on the supply side.
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 not factory-
supplied, the installer must provide fuses. 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 75 °C (167 °F) rated copper wire.
See chapter 8.1 Electrical Data and chapter 8.5 Cable Speci-
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 4.5 Motor Connection,
and chapter 4.7 Control Wiring.
4.3 Grounding
WARNING
LEAKAGE CURRENT HAZARD
Leakage currents exceed 3.5 mA. Failure to ground the
frequency converter properly could result in death or
serious injury.
•
Ensure the correct grounding of the equipment
by a certied electrical installer.
For electrical safety
•
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 1 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 for the ground
wires: 10 mm
2
(7 AWG).
•
Separately terminate individual ground wires,
both complying with the dimension
requirements.
Electrical Installation
VLT
®
AutomationDrive FC 301/302
10 Danfoss A/S © 05/2018 All rights reserved. MG33AT02
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