Installation; Mechanical Installation; Electrical Connection; Technical Data - Grundfos IO 50 SQFlex Installation And Operating Instructions Manual

4. Installation

Warning
Before starting any work on the IO 50, make sure that the power supply has been disconnect-
ed and that it cannot be accidentally connected.

4.1 Mechanical installation

The IO 50 SQFlex must be placed on a firm and stable surface that fits the box.

4.2 Electrical connection

The electrical connection must be carried out by an authorized electrician in accordance with local
regulations.
Two typical wirings are shown in section
• One DC conductor grounded. This option is intended for permanently mounted solar panels.
Note: For systems with an open-circuit voltage above 50 V, one conductor must be grounded, NEC
690.
• AC connection. This option is intended for portable AC generators or systems with an open-circuit
voltage below 50 VDC.
Position of wire jumpers
Wiring
One DC conductor grounded
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 ap-
plication in question.
Use appropriate compression fittings to ensure watertight cable entries.
The IO 50 must be grounded.
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.

5. Technical data

System voltages
• DC: Maximum 300 V, PE.
• AC: Maximum 254 V, 50/60 Hz, PE.
All four relay contacts must be used to meet the rated DC voltage. See the connection dia-
grams in section
Maximum current
16 A.
Ambient temperature
T : -30 °C to 50 °C.
amb.
Enclosure class
NEMA 3R or IP55.
6
A.1. Appendix.
1L1 - 3L2
A.1. Appendix.
Place the wire jumpers between
5L3 - 7L4 4T2 - 6T3