Danfoss VLT AutomationDrive FC 300 Series Design Guide

FC 300 Design Guide
Introduction to FC 300
- Start/stop via terminal 18.
Par. 5-10 Start [8].
- Quickstop via terminal 27.
Par. 5-12 Coasting Stop, Inverse [2].
- Termina l 29 Output
Par. 3-19 Torque Limit & Stop [27].
- Terminal 1 Relay output
Par. 5-40 Mechanical Brake Control [32].
" Parameter D ownload
Parameter download is possible via the following:
• PC Software MCT 10 tool - see how in FC 300 PC Software Operating Instructions.
• Fieldbus options - see how in FC 300 Profibus Operating Instructions or FC 300
DeviceNet Operating Instructions.
• LCP upload and download as described in par. group 0-5 .
" General Aspects of EMC Emissions
Electrical interfere nce is usually conducted at frequenci es in the range 150 kHz to 30
MHz. Airborne interference from the drive system in the range 30 MHz to 1 GHz is
generated from the AFD, the m otor cable, and the motor.
As shown in the following illustration, ca paciti ve currents in the motor cable coupled with a
high dV/dt from the motor voltage generate leakage currents.
The use of a shielded motor cable increases the leakage curre nt (see following illustration) bec ause shielded
cables have higher capacitance to g round than non-shielded cables. If the leakage current is not filtered,
it will cause greater interfere n ce on the m ains in the radio frequency range below app rox. 5 MHz. Since
the leakage current (I
1
) is carried back to the unit through the shield (I
3
), there will in p rinciple only be
a small electromagnetic field (I
4
) from the shielded motor cable according to the fol lowing figure.
The shield reduces the radiated interference b ut increases the low-frequency interference on the
mains. The motor cable shield m ust be connected to the adjustable frequency drive enclosure
as well as on the motor enclosure. This is best done by using integ rated shield clamps so as to
avoid twisted shield ends (pigtails). These increase the shield impedance at higher frequencies,
which reduces the shield effect and increases the leakage current (I
4
).
If a shielded cable is used for Profibus, standard bus, relay, control cable, signal interface, and
brake, the shield must be mounted on the e nclosure at both ends. In some situations, however,
it w ill be necessary to break the shield to avoid current loops.
43
MG.33.B3.22 - VLT is a registered Danfoss trademark

Danfoss VLT AutomationDrive FC 300 Series Specifications

General

Brand	Danfoss
Model	VLT AutomationDrive FC 300 Series
Category	DC Drives
Language	English