Danfoss VLT Midi Drive FC 280, Руководство по эксплуатации

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4 Electrical Installation
4.1 Safety Instructions
See chapter 2 Safety for general safety instructions.
WARNING
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 shielded cables could result in death or
serious injury.
•
Run output motor cables separately.
•
Use shielded 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
allowed 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 protection
against short circuit and overcurrent. 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 (167
°
F) rated copper wire.
See chapter 9.5 Cable Specifications for recommended wire
sizes and types.
4.2 EMC-compliant Installation
To obtain an EMC-compliant installation, follow the
instructions provided in
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
frequency converter properly could result in death or
serious injury.
•
Ensure the correct grounding of the equipment
by a certified 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:
-
Same diameter as the mains cable for
mains cable cross-section up to 16 mm
2
(6 AWG)
-
16 mm 2 (6 AWG) for mains cable cross-
section between 16 mm
2
(6 AWG) and
35 mm 2 (1 AWG)
- Half the diameter of the mains cable for
mains cable cross-section bigger than 35
mm
2
(1 AWG).
Separately terminate individual ground wires,
both complying with the dimension
requirements.
Electrical Installation Operating Guide
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