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WARNING
Please note that voltages up to 1099 VDC may occur on
the terminals.
Load Sharing calls for extra equipment and safety consid-
erations. For further information, see load sharing
Instructions MI.50.NX.YY.
WARNING
Please note that mains disconnect may not isolate the
frequency converter due to DC link connection
8.7.3 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 metres (82 feet).
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.
No.
Function
81, 82
Brake resistor terminals
See Brake instructions, MI.90.FX.YY and MI.50.SX.YY 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 shall control the
contactor.
CAUTION
Please note that voltages up to 1099 VDC, depending on
the supply voltage, may occur on the terminals.
Frame size F Requirements
The brake resistor(s) must be connected to the brake
terminals in each inverter module.
8.7.4 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
host controller. All standard PC’s are manufactured without
galvanic isolation in the USB port.
Any earth ground potential difference caused by not
following the recommendations described in the Operating
Instructions manual “Connection to Mains and Earthing”,
can damage the USB host controller through the shield of
the USB cable.
It is recommended to use a USB isolator with galvanic
isolation to protect the PC USB host controller from earth
ground potential differences, when connecting the PC to a
frequency converter through a USB cable.
It is recommended not to use a PC power cable with a
ground plug when the PC is connected to the frequency
converter through a USB cable. It reduces the earth ground
potential difference but does not eliminate all potential
differences due to the Ground and shield connected in the
PC USB port.
130B
T308.11
Illustration 8.62 USB connection.
8.7.5 The FC 300 PC Software
Data storage in PC via MCT 10 Set-Up Software:
1.
Connect a PC to the unit via USB com port
2.
Open MCT 10 Set-up Software
3.
Select in the “network” section the USB port
4.
Choose “Copy”
5.
Select the “project” section
6.
Choose “Paste”
7.
Choose “Save as”
All parameters are now stored.
Data transfer from PC to drive via MCT 10 Set-Up
Software:
1.
Connect a PC to the unit via USB com port
2.
Open MCT 10 Set-up software
3.
Choose “Open”– stored files will be shown
4.
Open the appropriate file
5.
Choose “Write to drive”
Electrical Installation
FC 300 Design Guide
MG.33.BD.02 - VLT
®
is a registered Danfoss trademark
219
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