￭
Compliance with the harmonic current limits in a public network
(IEC/EN 61000 3-2, IEC/EN 61000-3-12)
3-phase 230 V, 400 V or 480 V drive with the input choke
The drive complies with IEC 61000-3-12 provided that the short-circuit ratio
R
sce
is greater than or equal to value 350 at the interface point between the user's
supply and the public system. 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 short-circuit ratio
R
sce
is greater than or equal to 350.
The
R
sce
value meets the requirement if the short-circuit power at the interface
point between the user's supply and the public system is equal or bigger than the
value
S
cs
calculated as follows:
where:
Minimum short-circuit power limit
S
cs
Short-circuit ratio
R
sce
Equipment (drive) input power
S
eq
Drive nominal input current with the input choke
I
1n
Drive input voltage
U
1
3-phase 230 V, 400 V or 480 V drive without the input choke
Refer to 1-phase 230 V drive with or without the input choke (page 177).
1-phase 230 V drive with or without the input choke
Do a harmonic current assessment for the whole system that the drive is part of,
and make sure that the harmonic current limits are not exceeded at the interface
point between the user's supply and the public system. Based on results, consider
the use of the input choke with the drive. If the assessment is not possible, you
can connect the drive to the public network if you have a permission from the
network operator.
Always use the input choke if the short circuit capacity of the network at the drive
input terminals exceeds the limit specified for the drive. Refer to Input
choke (page 167) in section Electrical power network specification (page 166).
EMC compliance (IEC/EN 61800-3:2004 + A1:2012)
￭
Definitions
EMC stands for Electromagnetic Compatibility. It is the ability of
electrical/electronic equipment to operate without problems within an
Technical data 177
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