Grundfos 09916 Notice D'installation Et De Fonctionnement page 5

2. Installation
Warning
Before starting any work on the IO 50, make sure that the power
supply has been disconnected and that it cannot be accidentally
connected.
2.1 Mechanical installation
The IO 50 SQFlex must be placed on a firm and stable surface that fits the
box.
2.2 Electrical connection
The electrical connection must be carried out by an authorised electrician in
accordance with local regulations.
Two typical wiring diagrams are shown on page 25:
• one DC conductor earthed (fig. 1)
• floating DC supply or AC connection (fig. 2).
Position of wire jumpers
Wiring
One DC conductor earthed
Floating DC supply
Explanation
The jumpers are necessary in order to meet the demands of the circuit
breaker due to the complexity of handling DC currents. This means that
contact sets in series connection are required.
Warning
Never make any connections in the IO 50 unless the power supply
has been disconnected. The IO 50 must be connected in
accordance with the rules and standards in force for the application
in question.
Use appropriate compression fittings to ensure watertight cable
entries.
The IO 50 must be earthed.
The DC supply voltage is stated on the nameplate. Make sure that the IO 50
is suitable for the power supply on which it will be used.
Place the wire jumpers between
1L1 - 3L2 5L3 - 7L4
1L1 - 7L4 3L2 - 5L3
4T2 - 6T3
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