THDi
PWHD
Actual 30–90 kW (40–120 hp), 380-480 V (typical)
40.6
28.8
Limit for R
sce
≥120
48
46
Provided that the short-circuit power of the supply S
sc
is greater than or equal to:
S
SC
= 3
×
R
SCE
×
U
mains
×
I
equ
=
3
×
120
×
400
×
I
equ
at the interface point between the user’s supply and the public system (R
sce
).
It is the responsibility of the installer or user of the equipment to ensure, by consultation with the distribution network operator if
necessary, that the equipment is connected only to a supply with a short-circuit power S
sc
greater than or equal to specified above.
Other power sizes can be connected to the public supply network by consultation with the distribution network operator.
Compliance with various system level guidelines: The harmonic current data in the tables above are given in accordance with
IEC/EN 61000-3-12 with reference to the Power Drive Systems product standard. They may be used as the basis for calculation of the
harmonic currents' influence on the power supply system and for the documentation of compliance with relevant regional guide-
lines: IEEE 519 -1992; G5/4.
3.4.7 Immunity Requirements
The immunity requirements for drives depend on the environment in which they are installed. The requirements for the industrial
environment are higher than the requirements for the home and office environment. All Danfoss drives comply with the require-
ments for the industrial environment and therefore comply also with the lower requirements for home and office environment with
a large safety margin.
3.5 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 creepage/clear-
ance 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 the following illustrations.
To maintain PELV, all connections made to the control terminals must be PELV, for example, thermistors must be reinforced/double
insulated.
SMPS
e
3
0
b
b
8
9
6
.1
0
1
2
3
a
M
Illustration 24: Galvanic Isolation 0.37–22 kW (0.5–30 hp)
1
Supply (SMPS)
2
Optocouplers, communication between AOC and
BOC
3
Custom relays
a
Control card terminals
AJ363928382091en-000101 / 130R0983 | 37
Danfoss A/S © 2021.04
Product Overview
VLT® Flow Drive FC 111
Design Guide
