Ac Line Power Connection; Control Wiring; Access - Danfoss VLT AutomationDrive FC 303 Instruction Manual

Installation
•
Ground the cable in accordance with grounding
instructions provided.
•
Torque terminals in accordance with the
information provided in 10.4.1 Connection
Tightening Torques
•
Follow the motor manufacturer wiring
requirements
Figure 2.8 represents line power input, motor, and ground
grounding for basic adjustable frequency drives. Actual
configurations vary with unit types and optional
equipment.
Figure 2.8 Example of Motor, Line Power and Ground Wiring

2.4.4 AC Line Power Connection

•
Size wiring based upon the input current of the
Adjustable frequency drive. For maximum wire
sizes, see 10.1 Power-dependent Specifications.
•
Comply with local and national electrical codes
for cable sizes.
•
Connect 3-phase AC input power wiring to
terminals L1, L2, and L3 (see Figure 2.8).
•
Depending on the configuration of the
equipment, input power will be connected to the
line power input terminals or the input
disconnect.
VLT ® AutomationDrive Instruction
Manual

2.4.5 Control Wiring

2.4.5.1 Access

- LC -
Figure 2.9 Control Wiring Access for A2, A3, B3, B4, C3 and C4
Enclosures
®
MG.33.AI.22 - VLT is a registered Danfoss trademark
•
Ground the cable in accordance with grounding
instructions provided in 2.4.2 Grounding
Requirements
•
All adjustable frequency drives may be used with
an isolated input source as well as with ground
reference power lines. When supplied from an
isolated line power source (IT line power or
floating delta) or TT/TN-S line power with a
grounded leg (grounded delta), set 14-50 RFI 1 to
OFF. When off, the internal RFI filter capacitors
between the chassis and the intermediate circuit
are isolated to avoid damage to the intermediate
circuit and to reduce ground capacity currents in
accordance with IEC 61800-3.
•
Isolate control wiring from high power
components in the adjustable frequency drive.
•
If the adjustable frequency drive is connected to
a thermistor, for PELV isolation, optional
thermistor control wiring must be reinforced/
double insulated. A 24 VDC supply voltage is
recommended.
•
Remove access coverplate with a screwdriver. See
Figure 2.9.
•
Or remove front cover by loosening attaching
screws. See Figure 2.10.
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