Requirements - Danfoss vlt fcd 302 Operating Instructions Manual

Installation

2.4.1 Requirements

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EQUIPMENT HAZARD
Rotating shafts and electrical equipment can be hazardous.
All electrical work must conform to national and local
electrical codes. It is strongly recommended that installation,
start-up, and maintenance be performed only by trained and
qualified personnel. Failure to follow these guidelines could
result in death or serious injury.
For your safety, comply with the following requirements:
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Electronic controls equipment is connected to
hazardous mains voltage. Extreme care should be
taken to protect against electrical hazards when
applying power to the unit.
•
Wear safety glasses whenever working on electric
control or rotating equipment.
•
Run motor cables from multiple frequency
converters separately. Induced voltage from output
motor cables run together can charge equipment
capacitors even with the equipment turned off and
locked out.
Overload and equipment protection
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An electronically activated function within the
frequency converter provides overload protection
for the motor. Set 1-90 Motor Thermal Protection to
ETR (Electronic Thermal Relay) for warning trip if
desired. It measures motor current and is internally
set based on the value in 1-24 Motor Current. A 1.2 x
FLA (full load amps) service factor is built-in and
maintained. Should the motor current increase
above that value, the overload will calculate the
level of increase to activate timing for the trip
(controller output stop) function. The higher the
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VLT Decentral Drive FCD 302 Operating Instructions
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Wire type and ratings
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Cable glands
It must be assured that appropriate cable glands needed for
the environment are chosen and carefully mounted.
Do not plug/unplug the electronic part with mains voltage
switched on.
MG.04.F2.02 - VLT is a registered Danfoss trademark
current draw, the quicker the trip response. The
overload provides Class 20 motor protection. See
chapter 7 Troubleshooting for details on the trip
function.
Because the motor wiring carries high frequency
current, it is important that wiring for mains input
power, motor power, and control are run
separately. Use separated shielded wire or metallic
conduit. Failure to isolate power, motor, and
control wiring could result in less than optimum
equipment performance.
When being placed in cable trays, sensitive cables
such as telephone or data cables should not be
placed in the same cable tray as the motor cable. If
signal cables run across power cables, this is done
at an angle of 90 .
All wiring must comply with local and national
regulations regarding cross-section and ambient
temperature requirements.
The screen must have low RF impedance, which is
achieved by a braided screen of copper, aluminium
or iron.
Danfoss recommends that all power connections
be made with a minimum 75 C rated copper wire.
See section 8.1 Electrical Data and Wire Sizes for
recommended wire sizes.
WARNING