System Impedance Overview - Wilo Control EC-Fire Installation And Operating Instructions Manual

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
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).
Installation and operating instructions Wilo-Control EC-Fire
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
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 information
must be obtained from the local energy supply com-
pany and the manufacturer.
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
English
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
29