Additional Connections; Dc Bus Connection; Load Sharing; Installation Of Brake Cable - Danfoss VLT AutomationDrive FC 300 Design Manual

Electrical Installation
relay1
relay2
7 7
Illustration 7.59 Relay Outputs 1 and 2

7.6 Additional Connections

7.6.1 DC Bus Connection

The DC bus terminal is used for DC back-up, with the
intermediate circuit being supplied from an external
source. It uses terminals 88 and 89.
Contact Danfoss if further information is required.

7.6.2 Load Sharing

Use terminals 88 and 89 for load sharing.
The connection cable must be screened and the max.
length from the frequency converter to the DC bar is
limited to 25 m (82 ft).
Load sharing enables linking of the DC intermediate
circuits of several frequency converters.
142
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®
VLT AutomationDrive FC 300 Design Guide, 0.25-75 kW
03
240Vac, 2A
02
01
06
240Vac, 2A
05
400Vac, 2A
04
®
MG33BE02 - VLT
WARNING
Note that voltages up to 1099 V DC may occur on the
terminals.
Load Sharing calls for extra equipment and safety consid-
erations. For further information, see load sharing
Instructions.
WARNING
Note that mains disconnect may not isolate the frequency
converter due to DC link connection

7.6.3 Installation of Brake Cable

The connection cable to the brake resistor must be
screened and the max. length from the frequency
converter to the DC bar is limited to 25 m (82 ft).
1. Connect the screen by means of cable clamps to
the conductive back plate on the frequency
converter and to the metal cabinet of the brake
resistor.
2. Size the brake cable cross-section to match the
brake torque.
Terminals 81 and 82 are brake resistor terminals.
See Brake instructions for more information about safe
installation.
NOTE
If a short circuit in the brake IGBT occurs, prevent power
dissipation in the brake resistor by using a mains switch or
contactor to disconnect the mains for the frequency
converter. Only the frequency converter should control the
contactor.
CAUTION
Note that voltages up to 1099 V DC, depending on the
supply voltage, may occur on the terminals.
7.6.4 How to Connect a PC to the
Frequency Converter
To control the frequency converter from a PC, install the
MCT 10 Set-up Software.
The PC is connected via a standard (host/device) USB
cable, or via the RS-485 interface as shown in the section
Bus Connection in the Programming Guide.
USB is a serial bus utilizing 4 shielded wires with Ground
pin 4 connected to the shield in the PC USB port.
Connecting the PC to a frequency converter through the
USB cable, there is a potential risk of damaging the PC USB
is a registered Danfoss trademark