Danfoss VLT AutomationDrive FC 302 Design Manual page 149

Electrical Installation Con...
10.3.2 DC Bus Connection
The DC bus terminal is used for DC back-up, with the DC
link being supplied from an external source.
Terminal Function
88, 89 DC Bus
Table 10.2 DC Bus Terminals
10.3.3 Load Sharing Connection
Load sharing links together the DC intermediate circuits of
several drives. For an overview, see chapter 5.5 Load Share
Overview.
The load sharing feature requires extra equipment and
safety considerations. Consult Danfoss for ordering and
installation recommendations.
Terminal Function
88, 89 Load sharing
Table 10.3 Load Sharing Terminals
The connection cable must be shielded and the maximum
length from the drive to the DC bar is limited to 25 m
(82 ft).
10.3.4 Brake Cable Connection
The connection cable to the brake resistor must be
shielded and the maximum length from the drive to the
DC bar is limited to 25 m (82 ft).
•
Use cable clamps to connect the shield to the
conductive backplate on the drive and to the
metal cabinet of the brake resistor.
•
Size the brake cable cross-section to match the
brake torque.
Terminal Function
81, 82 Brake resistor terminals
Table 10.4 Brake Resistor Terminals
®
See the VLT Brake Resistor MCE 101 Design Guide for more
details.
NOTICE
If a short circuit in the brake module occurs, prevent
excessive power dissipation in the brake resistor by using
a mains switch or contactor to disconnect the mains
from the drive.
MG38C202
Design Guide
10.3.5 Personal Computer Connection
To control the drive from a PC, install the MCT 10 Set-up
Software. The PC is connected via a standard (host/device)
USB cable, or via the RS485 interface. For more information
on RS485, see the RS485 Installation and Set-up section in
®
the VLT
Guide.
USB is a universal serial bus utilizing 4 shielded wires with
ground pin 4 connected to the shield in the PC USB port.
All standard PCs are manufactured without galvanic
isolation in the USB port.
To prevent damage to the USB host controller through the
shield of the USB cable, follow the ground recommen-
dations described in the operating guide.
When connecting the PC to the drive through a USB cable,
Danfoss recommends using a USB isolator with galvanic
isolation to protect the PC USB host controller from
ground potential differences. It is also recommended not
to use a PC power cable with a ground plug when the PC
is connected to the drive through a USB cable. These
recommendations reduce the ground potential difference,
but does not eliminate all potential differences due to the
ground and shield connected in the PC USB port.
Danfoss A/S © 01/2018 All rights reserved.
AutomationDrive FC 302, 315–1200 kW Design
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