4 Electrical Installation
4.1 Safety Instructions
See
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 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
.
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.
4.2 EMC-compliant Installation
To obtain an EMC-compliant installation, follow the
instructions provided in
,
and
.
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 one frequency converter to
another in a daisy chain fashion (see
•
Keep the ground wire connections as short as
possible.
•
Follow motor manufacturer wiring requirements.
•
Minimum cable cross-section: 10 mm
2
(7 AWG)
(or 2 rated ground wires terminated separately).
Electrical Installation
VLT
®
Midi Drive FC 280
10
Danfoss A/S © 11/2015 All rights reserved.
MG07A102
4
4
