Electrical Installation; Safety Instructions; Emc-Compliant Installation; Grounding - Danfoss VLT AutomationDrive FC 301 Instruction Manual

Electrical Installation

4 Electrical Installation

4.1 Safety Instructions

See chapter 2 Safety for general safety instructions.
4 4
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 shielded cables or
metal conduits could result in death or serious injury.
CAUTION
DC CURRENT HAZARD!
A DC current in the protective grounding conductor can
be caused by the adjustable frequency drives. When a
residual current-operated protective or monitoring
device (RCD/RCM) is used for protection, only an RCD or
RCM of Type B is allowed.
NOTICE!
The adjustable frequency drive is supplied with Class 20
motor overload protection.
Overcurrent Protection:
•
Additional protective equipment such as short-
circuit protection or motor thermal protection
between adjustable frequency drive and motor is
required for applications with multiple motors.
•
Input fusing is required to provide short-circuit
and overcurrent protection. If not factory-
supplied, fuses must be provided by the installer.
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 167 °F [75 °C] rated copper wire.
See chapter 8.1 Electrical Data and chapter 8.5 Cable Specifi-
cations for recommended wire sizes and types.
12
Instruction Manual

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 are higher than 3.5 mA. It is the
responsibility of the user or certified electrical installer to
ensure correct grounding of the equipment. Failure to
ground the adjustable frequency drive properly could
result in death or serious injury.
For electrical safety
For EMC-compliant installation
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
WARNING
•
Ground the adjustable frequency drive properly
in accordance with applicable standards and
directives.
•
Use a dedicated ground wire for input power,
motor power and control wiring.
•
Do not ground one adjustable frequency drive to
another in a "daisy chain" fashion.
•
Keep the ground wire connections as short as
possible.
•
Follow the motor manufacturer wiring
requirements.
•
Minimum cable cross-section: 0.016 in
(or 2 rated ground wires terminated separately).
•
Establish electrical contact between cable shield
and adjustable frequency drive enclosure by
using metal cable connectors or by using the
clamps provided on the equipment (see Figure 4.5
and Figure 4.6).
•
Use high-strand wire to reduce electrical
interference.
•
Do not use pigtails.
2 [10 mm 2 ]
MG33AN22