Grundfos IO 50 SQFlex Installation And Operating Instructions Manual page 9

• floating DC supply or AC connection (fig. Wiring diagram, floating DC
supply or AC connection).
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
Death or serious personal injury
‐
Never make any connections in the IO 50 unless the power sup-
ply has been disconnected. The IO 50 must be connected in ac-
cordance 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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