4 Electrical Installation
4.1 Safety Instructions
See 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 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 8.8 Fuse Specifications.
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
8.1 Electrical Data and 8.5 Cable Specifications for
recommended wire sizes and types.
4.2 EMC-compliant Installation
To obtain an EMC-compliant installation, follow the
instructions provided in 4.3 Grounding, 4.4 Wiring Schematic,
4.6 Motor Connection and 4.8 Control Wiring.
4.3 Grounding
WARNING
LEAKAGE CURRENT HAZARD!
Leakage currents are higher than 3.5 mA. It is the responsi-
bility 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
•
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.
•
Do not use pigtails.
•
Follow the motor manufacturer wiring
requirements.
•
Minimum cable cross-section: 10 mm
2
(or 2 rated
ground wires terminated separately).
For EMC-compliant installation
•
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.
•
Use high-strand wire to reduce electrical
interference.
Electrical Installation
VLT
®
HVAC Drive Instruction Manual
MG11AJ22 - Rev. 2013-09-13 13
4 4
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