FC 300 Design Guide
How to Install
" High Voltage Test
Carry out a high voltage test by short circuiting terminals U, V, W, L
1
,L
2
and L
3
.Energizebymax.
2.15 kV DC for one second between this short circuit and the chassis.
NOTE
When running high voltage tests of the entire installation, interrupt the mains and
motor connection if the leakage currents are too high.
" Safety Grounding
The adjustable frequency drive has a high leakage current and must be grounded
appropriately for safety reasons.
The ground leakage current from the adjustable frequency drive exceeds 3.5 mA. To e
nsure a good
mechanical connection from the ground cable to the ground connection (terminal 95), the cable
cross-section must be at least 0 .0 15 in
2
(10 mm
2
) or 2 rated ground wires terminated separately.
" Electrical Installation - EMC Precautions
The following is a guideline to good engineering practice w hen installing adjustable frequency
drives. Follow these guidelines to comply with EN 61800-3 First environment.Iftheinstallation
is in EN 6 1800-3 Second environment, i .e . industrial networks, or in an installation with its ow n
transformer, deviation f rom these guidelines is allowed but not recommended. See als o p aragraphs
CE Labeling, General Aspects of EMC Emission and EMC Test Results.
Good engineering practice to ensure EMC-correct electrical installation:
• Use only braided shielded/armored motor cables and braided s hielded/armored control cables. The shield
should p rovide a minimum coverage of 80%. The shield material must be metal, not limited to but
typically copper, aluminum, steel or lead. Ther e are no special requirements for the mains cable.
• Installations using rigid metal conduits are not required to use shielded cable, but the m otor cable
must be installed in conduit separate from the control and mains cables. Full connection of the
conduit from the drive to the motor is required. TheEMCperformanceofflexibleconduitsvaries
considerably and information from the manufacturer must be obtained.
• Connect the shield/armor/conduit to ground at both ends for motor cables as well as for control cables.
In some cases, it is not possible to connect the shield in both ends. If so, connect the shie ld at the
adjustable frequency drive. See also Grounding of Braided Shielded /Armored Control Cables.
• Avoid terminating the shield/armor with twisted ends (pigtails ). It increases the high
frequency impedance of the shield, which reduces its e ffectiveness at high frequencies. Use
low-impedance cable c lam ps or EMC cab le gl ands inste ad.
• Avoid using non-shielded/unarmored motor or control c ables inside cabinets housing
the drive(s), whenever this can be avoided.
Leave the shield as close to the connectors as possible.
The illustration shows an example of an EMC-correct electrical installation of an IP 20 adjustable freque ncy
drive. The adjustable frequency drive is fitted in an installation cabinet with an output contactor and
connected to a PLC, which is installed in a separate cabinet. Other ways of performing the installa tion may
yield just as good EMC performance, provided the above guidelines for engin eering practice are followed.
If the installation is not carried out according to the guidelines and if non-shielded cables and
control wires are u sed , some emission requirements are not complied with, although the immunity
requirements are fulfilled. See the paragraph EMC test results.
106
MG.33.B3.22 - VLT is a registered Danfoss trademark
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