Electrical Installation; Safety - Danfoss VLT AutomationDrive FC 301 Design Manual

Electrical Installation

9 Electrical Installation

9.1 Safety

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 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, or
•
use screened cables
CAUTION
SHOCK HAZARD
The frequency converter can cause a DC current in the
PE conductor.
9 9
•
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 the RCD
may not provide the intended protection.
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 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.
•
Keep the ground wire connections as short as
possible.
•
Follow motor manufacturer wiring requirements.
•
Minimum cable cross-section: 10 mm
ground wires terminated separately).
112
®
VLT AutomationDrive FC 301/FC 302 Design Guide, 0.25-75 kW
For EMC-compliant installation
•
•
•
NOTICE
POTENTIAL EQUALISATION
Risk of electrical interference, when the ground potential
between the frequency converter and the system is
different. Install equalising cables between the system
components. Recommended cable cross-section: 16 mm
2
(or 2 rated
MG33BF02 - Rev. 2013-12-20
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
chapter 9.4 Motor Connection).
Use high-strand wire to reduce electrical
interference.
Do not use pigtails.
2 .