Danfoss VLT Flow Drive FC 111 Design Guide

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Illustration 25: Galvanic Isolation 30–90 kW (40–120 hp)
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Supply (SMPS) including signal isolation of UDC, in-
dicating the intermediate current voltage
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Gate drive that runs the IGBTs (trigger transformers/
optocouplers)
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Current transducers
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Internal soft-charge, RFI, and temperature measure-
ment circuits
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Custom relays
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Control card terminals
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Illustration 26: Galvanic Isolation 110–315 kW (150–450 hp)
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Current transducers
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Galvanic isolation for the RS485 standard bus inter-
face
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Gate drive for the IGBTs
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Supply (SMPS) including signal isolation of V DC, in-
dicating the intermediate current voltage
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Galvanic isolation for the 24 V back-up option
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Opto-coupler, brake module (optional)
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Internal inrush, RFI, and temperature measurement
circuits
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Customer relays
The functional galvanic isolation (see Illustration 24) is for the RS485 standard bus interface.
C A U T I O N
INSTALLATION AT HIGH ALTITUDE
At altitudes above 2000 m (6500 ft), contact Danfoss regarding PELV.
3.6 Ground Leakage Current
Follow national and local codes regarding protective earthing of equipment where leakage current exceeds 3.5 mA.
Drive technology implies high frequency switching at high power. This generates a leakage current in the ground connection.
The ground leakage current is made up of several contributions and depends on various system configurations, including:
AJ363928382091en-000101 / 130R098338 | Danfoss A/S © 2021.04
Product Overview
VLT® Flow Drive FC 111
Design Guide

Danfoss VLT Flow Drive FC 111 Specifications

General

Brand	Danfoss
Model	VLT Flow Drive FC 111
Category	DC Drives
Language	English