Harmonics Emission Requirements; Immunity Requirements; Galvanic Isolation (Pelv) - Danfoss VLT Micro Drive FC 51 Design Manual

Product Overview

3.2.4 Harmonics Emission Requirements

Equipment connected to the public supply network
NOTICE
Without a power option, the frequency converter may
not comply with harmonics emission requirements.
Options Definition
1 IEC/EN 61000-3-2 Class A for 3-phase balanced
equipment (for professional equipment only up to 1
kW total power).
2 IEC/EN 61000-3-12 Equipment 16 A-75 A and profes-
sional equipment as from 1 kW up to 16 A phase
current.
Table 3.4 Harmonics Emission Requirements

3.2.5 Immunity Requirements

The immunity requirements for frequency converters
depend on the environment where they are installed. The
requirements for the industrial environment are higher
than the requirements for the home and office
environment. All Danfoss frequency converters comply
with the requirements for the industrial environment and
therefore comply also with the lower requirements for
home and office environment with a large safety margin.

3.3 Galvanic Isolation (PELV)

PELV offers protection through extra low voltage.
Protection against electric shock is ensured when the
electrical supply is of the PELV type and the installation is
made as described in local/national regulations on PELV
supplies.
All control terminals and relay terminals 01-03/04-06
comply with PELV (protective extra low voltage) (does not
apply to grounded delta leg above 440 V).
Galvanic (ensured) isolation is obtained by fulfilling
requirements for higher isolation and by providing the
relevant creapage/clearance distances. These requirements
are described in the EN 61800-5-1 standard.
The components that make up the electrical isolation, as
described, also comply with the requirements for higher
isolation and the relevant test as described in EN
61800-5-1.
The PELV galvanic isolation can be shown in Illustration 3.7.
To maintain PELV, all connections made to the control
terminals must be PELV, for example, thermistor must be
reinforced/double insulated.
MG02K402
Design Guide
0.25–22 kW (0.34–30 hp)
3
1 Supply (SMPS)
2 Optocouplers, communication between AOC and BOC
3 Custom relays
a Control card terminals
Illustration 3.6 Galvanic Isolation
30–90 kW (40–120 hp)
5
1 Supply (SMPS) including signal isolation of UDC, indicating
the intermediate current voltage
2 Gate drive that runs the IGBTs (trigger transformers/opto-
couplers)
3 Current transducers
4 Internal soft-charge, RFI, and temperature measurement
circuits
5 Custom relays
a Control card terminals
Illustration 3.7 Galvanic Isolation
The functional galvanic isolation (see Illustration 3.6) is for
the RS485 standard bus interface.
Danfoss A/S © 01/2016 All rights reserved.
SMPS
1
2
a
3
4 1 2
a
3 3
M
M
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