Danfoss VLT Flow Drive FC 111 Design Manual page 38

VLT® Flow Drive FC 111
Design Guide
4 1
5
a
Illustration 25: Galvanic Isolation 30–90 kW (40–120 hp)
1 Supply (SMPS) including signal isolation of UDC, in-
dicating the intermediate current voltage
2 Gate drive that runs the IGBTs (trigger transformers/
optocouplers)
3 Current transducers
7 6 4
8
5
Illustration 26: Galvanic Isolation 110–315 kW (150–450 hp)
1 Current transducers
2 Galvanic isolation for the RS485 standard bus inter-
face
3 Gate drive for the IGBTs
4 Supply (SMPS) including signal isolation of V DC, in-
dicating the intermediate current voltage
The functional galvanic isolation (see
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:
38 | Danfoss A/S © 2021.04
3
M
2
1
M
3
2
Illustration 24) is for the RS485 standard bus interface.
C A U T I O N
4 Internal soft-charge, RFI, and temperature measure-
ment circuits
5 Custom relays
a Control card terminals
5 Galvanic isolation for the 24 V back-up option
6 Opto-coupler, brake module (optional)
7 Internal inrush, RFI, and temperature measurement
circuits
8 Customer relays
Product Overview
AJ363928382091en-000101 / 130R0983