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.
Illustration 7.60 USB Connection.
7.6.5
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 frequency converter 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”.
All parameters are now transferred to the frequency
converter.
A separate manual for MCT 10 Set-up Software is available.
7.7 Safety
7.7.1 High Voltage Test
Carry out a high voltage test by short-circuiting terminals
U, V, W, L
1
, L
2
and L
3
. Energize maximum 2.15 kV DC for
380-500 V frequency converters and 2.525 kV DC for
525-690 V frequency converters for one second between
this short-circuit and the chassis.
WARNING
When running high voltage tests of the entire installation,
interrupt the mains and motor connection if the leakage
currents are too high.
7.7.2 Earthing
The following basic issues need to be considered when
installing a frequency converter, so as to obtain electro-
magnetic compatibility (EMC).
•
Safety earthing: Note that the frequency
converter has a high leakage current and must be
earthed appropriately for safety reasons. Apply
local safety regulations.
•
High-frequency earthing: Keep the earth wire
connections as short as possible.
Connect the different earth systems at the lowest possible
conductor impedance. The lowest possible conductor
impedance is obtained by keeping the conductor as short
as possible and by using the greatest possible surface area.
The metal cabinets of the different devices are mounted
on the cabinet rear plate using the lowest possible HF
impedance. This avoids having different HF voltages for
the individual devices and avoids the risk of radio
interference currents running in connection cables that
may be used between the devices. The radio interference
will have been reduced.
In order to obtain a low HF impedance, use the fastening
bolts of the devices as HF connection to the rear plate. It is
necessary to remove insulating paint or similar from the
fastening points.
Electrical Installation
VLT
®
AutomationDrive FC 300 Design Guide, 0.25-75 kW
MG33BE02 - VLT
®
is a registered Danfoss trademark 143
7 7
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