System Impedance Overview - Wilo Control EC-Fire Notice De Montage Et De Mise En Service

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13.2 System impedance overview

NOTICE
In accordance with EN / IEC 61000-3-11
(see table below), the switchgear and pump with a
motor power of ... kW (column 1) are provided for
operation on a mains power supply with a system
impedance of Zmax at the house connection of
max. ... ohm (column 2) for a maximum number
of ... switch connections (column 3).
If the mains impedance and the number of switch-
ing operations per hour are greater than the values
given in the table, the switchgear with the pump
may lead to temporary voltage drops and also to
spurious voltage fluctuations ("flicker") due to the
unfavourable mains conditions.
Therefore, measures may be necessary before the
switchgear with the pump can be operated on this
connection as intended. The necessary informa-
tion must be obtained from the local energy
supply company and the manufacturer.
3~400/380 V
2-pole
Direct starting
NOTICE
The maximum number of switching operations per
hour specified in the table for each power is
determined by the pump motor and must not be
exceeded (adjust parameterisation of the control-
ler accordingly; see follow-up times, for example).
62
Power [kW]
(Column 1)
0.37
0.55
0.75
1.1
1.5
2.2
3.0
4.0
5.5
7.5
11.0
15.0
System impedance [Ω]
(Column 2)
2.629
1.573
0.950
0.944
0.850
0.628
0.582
0.508
0.458
0.515
0.431
0.377
0.339
0.321
0.257
0.212
0.186
0.167
0.204
0.148
0.122
0.107
0.130
0.094
0.077
0.115
0.083
0.069
0.059
0.042
0.037
0.027
0.024
0.017
Switching operations per
hour (Column 3)
6 – 30
6 – 30
6 – 18
24
30
6 – 12
18
24
30
6 – 12
18
24
30
6
12
18
24
30
6
12
18
24
6
12
18
6
12
18
6
12
6
12
6
12
WILO SE 06/2018