Ac Mains Connection; Motor And Mains Connection With Service Switch; Control Wiring - Danfoss VLT Decentral Drive FCD 302 Operating Manual

Electrical Installation

4.8 AC Mains Connection

Size wiring based on the input current of the frequency
converter. See the maximum wire size in Table 7.1 in
chapter 7 Specifications.
Comply with local and national electrical codes for cable
sizes.
Procedure
1. Connect 3-phase AC input power wiring to
terminals L1, L2, and L3.
2. Depending on the configuration of the
equipment, connect the input power to the
mains terminals or the input disconnect.
3. Ground the cable in accordance with grounding
instructions provided in chapter 4.3 Grounding.
4. When supplied from an isolated mains source (IT
mains or floating delta) or TT/TN-S mains with a
grounded leg (grounded delta), set
parameter 14-50 RFI Filter to OFF. When set to OFF,
the internal RFI filter capacitors between the
chassis and the DC link are isolated to avoid
damage to the DC link and to reduce ground
capacity currents in accordance with IEC 61800-3.
Number
91 92 93 Mains voltage 3x380–480 V
L1 L2 L3 –
PE – – Ground connection
Table 4.2 Terminal 91, 92, and 93
MG04F502
Operating Guide
4.9 Motor and Mains Connection with
Service Switch
Illustration 4.11 Motor and Mains Connection with Service
Switch

4.10 Control Wiring

WARNING
UNINTENDED START
When the frequency converter is connected to AC mains,
DC supply, or load sharing, the motor may start at any
time. Unintended start during programming, service, or
repair work can result in death, serious injury, or
property damage. The motor can start via an external
switch, a fieldbus command, an input reference signal
from the LCP, or after a cleared fault condition.
To prevent unintended motor start:
•
•
•
Danfoss A/S © 11/2016 All rights reserved.
Disconnect the frequency converter from the
mains.
Press [Off/Reset] on the LCP before
programming parameters.
Completely wire and assemble the frequency
converter, motor, and any driven equipment
before connecting the frequency converter to
AC mains, DC supply, or load sharing.
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