Danfoss VLT FC 322 Instruction Manual page 15

Installation VLT® Automation VT Drive FC 322 D-Frame Instruction Manual
WARNING
EQUIPMENT HAZARD!
Rotating shafts and electrical equipment can be hazardous.
2 2
All electrical work must conform to national and local
electrical codes. It is strongly recommended that instal-
lation, start up, and maintenance be performed only by
trained and qualified personnel. Failure to follow these
guidelines could result in death or serious injury.
CAUTION
WIRING ISOLATION!
Run input power, motor wiring and control wiring in three
separate metallic conduits or use separated shielded cable
for high frequency noise isolation. Failure to isolate power,
motor and control wiring could result in less than
optimum frequency converter and associated equipment
performance.
For your 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
8 Warnings and Alarms 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
Figure 2.3. 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
2-4 MG21E122 - VLT® is a registered Danfoss trademark
Remote Site Products - 1-888-532-2706 - www.remotesiteproducts.com
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fusing is required to provide this protection, see
Figure 2.4. If not factory supplied, fuses must be
provided by the installer as part of installation.
See maximum fuse ratings in 10.3.1 Protection.
Figure 2.3 Example of Proper Electrical Installation Using Conduit