Danfoss VLT AutomationDrive FC 300 Instruction Manual page 19

Installation
For your safety, comply with the following requirements
•
Electronic controls equipment is connected to
hazardous AC line voltage. Extreme care should
be taken to protect against electrical hazards
when applying power to the unit.
•
Run motor cables from multiple adjustable
frequency drives multiple adjustable frequency
drives 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
adjustable frequency drive 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 line power,
motor power, and control is 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 adjustable frequency drives must be provided
with short-circuit and overcurrent protection.
Input 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.
®
VLT Automation Drive D-Frame
Instruction Manual
Speed
Figure 2.3 Example of Proper Electrical Installation Using Conduit
®
MG34U222 - VLT is a registered Danfoss trademark
Stop
Start
Line Power
Control
2 2
Motor
2-5