DAB MCE-11/P, Instruction For Installation And Maintenance, Page: 67 / 600

ENGLISH
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Figure 2: Electrical connections
2.2.1 Electrical
connections
To improve the immunity to any noise radiated towards other equipment we recommend using separate
ducts for the inverter supply cables.
The installer shall be responsible for checking that the electric power supply system is fitted with an efficient
earthing system according to the regulations in force.
CAUTION
:
The line voltage may change when the electrical pump is started up by the inverter.
The voltage may be subject to variations according to other devices connected, and the quality of the line.
2.2.1.1 Connection to the power line
The inverter must be connected to the single-phase power line by means of a 3-core cable (phase n
earth). The relative line specifications must correspond to those shown in Table 1.
The input terminals are those marked with the text LN and an arrow pointing towards the terminals; see
Figure 2.
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 n 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 1/3 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 4 also indicates the sizes of thermal magnetic circuit breakers to be used, according to the current
absorption.