For personal safety, comply with the following
requirements
•
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.
•
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.
•
Field wiring terminals are not intended to receive
a conductor one size larger.
Overload and Equipment Protection
•
An electronically activated function within the
frequency converter provides overload protection
for the motor. The overload calculates the level of
increase to activate timing for the trip (controller
output stop) function. The higher the current
draw, the quicker the trip response. The overload
provides Class 20 motor protection. See for
details on the trip function.
•
Because the motor wiring carries high frequency
current, it is important that wiring for mains,
motor power, and control are run separately. Use
metallic conduit or separated shielded wire. See
. Failure to isolate power, motor,
and control wiring could result in less than
optimum equipment performance.
•
All frequency converters must be provided with
short-circuit and over-current protection. Input
fusing is required to provide this protection, see
. If not factory supplied, fuses must
be provided by the installer as part of installation.
See maximum fuse ratings in
.
Motor
Line Power
Stop
Start
Speed
Control
130BX370.10
Illustration 3.3 Example of Proper Electrical Installation Using
Conduit
L1
L1
L2
L2
L3
L3
GND
91
92
93
Fuses
130BB460.10
Illustration 3.4 Frequency Converter Fuses
Wire Type and Ratings
•
All wiring must comply with local and national
regulations regarding cross-section and ambient
temperature requirements.
•
Danfoss recommends that all power connections
are made with a minimum 75
°
C rated copper
wire.
Installation
VLT® Refrigeration Drive 110-250 kW Operating Instructions
MG16F102 - VLT® is a registered Danfoss trademark
11
3
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