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The section, type and laying of cables for inverter power supply and electric pump connections must be
selected in compliance with current standards. Table 2 provides indications on the cable section to be used.
The table refers to cables in PVC with 3-core cable (phase neutral + earth)with the minimum recommended
section based on the current and length of cable.
The current supply to the inverter can generally by estimated (with a relative safety margin) at 2.5 times the
current absorbed by the three-phase pump. For example, if the pump connected to the inverter absorbs 10A
per phase, the inverter power supply cables should be sized for 25A.
Although the inverter is already equipped with internal safety devices, the installation of a suitably sized
thermal magnetic circuit breaker is recommended.
If using all the power available, in order to calculate the current to use when selecting the cables and the
thermal magnetic cut-out, refer to the Table 3 which specifies the type of thermal magnetic cut-out to be
used according to current values.
CAUTION: The thermal magnetic circuit breaker and power cables of the inverter and pump must be sized
according to the system.
The differential switch that protects the system must be adequately sized and must be of "Class A" type. The
automatic differntial switch must be marked with the following two symbols:
If the instructions supplied in this manual are in contrast with the regulations in force the regulations must be
considered as valid.
10 m
20 m
30 m
1,5
1,5
1,5
4 A
1,5
1,5
2,5
8 A
1,5
2,5
4
12 A
2,5
2,5
4
16 A
4
4
6
20 A
4
4
6
24 A
6
6
10
28 A
2.2.1.2
Connection to the power line PWM 420 – 415 – 410 – 407 – 405 – 404
The inverter must be connected to the 3-phase power line by means of a 4-core cable (3 phases+earth) The
relative line specifications must correspond to those shown in Table 1.
The input terminals are those marked with the text RST and an arrow pointing towards the terminals; see
Figure 4. The section, type and laying of cables for inverter power supply and electric pump connections
must be selected in compliance with current standards. Table 4 provides indications on the cable section to
be used. The table refers to cables in PVC with 4 wires (3 phases+earth) with the minimum recommended
section based on the current and length of cable.
The current supply to the inverter can normally be calculated (taking a safety margin into account) as 1/8 of
the current absorbed by the pump.
Although the inverter is already equipped with internal safety devices, the installation of a suitably sized
thermal magnetic circuit breaker is recommended.
If the entire power range available is used, for specific information on the current to be used when choosing
cables and the thermal magnetic circuit breaker, refer to Table 4.
Table 3 also indicates the sizes of thermal magnetic circuit breakers to be used, according to the current
absorption.
CAUTION: The thermal magnetic circuit breaker and power cables of the inverter and pump must be sized
according to the system.
The differential switch that protects the system must be adequately sized and must be of "Class AS" type.
The automatic differntial switch must be marked with the following two symbols:
If the instructions supplied in this manual are in contrast with the regulations in force the regulations must be
considered as valid.
Power supply cable section in mm²
40 m
50 m
60 m
70 m
1,5
2,5
2,5
2,5
4
4
4
6
6
6
10
10
10
10
10
10
10
16
10
16
16
Data concerning 3-core PVC cables (phase neutral+earth)
Table 2: Single phase line power cable section
ENGLISH
80 m
90 m
100 m
2,5
2,5
4
4
6
6
6
10
10
10
10
10
10
10
16
16
16
16
16
16
16
16
16
78
120 m
140 m
160 m
180 m
4
6
6
10
10
10
16
16
16
16
16
200 m
6
10
16
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