Wiring Diagrams; Motor Protection - Grundfos SQF Manual Del Usuario

3.3.1 Residual-current circuit breakers
WARNING
Electric shock
Death or serious personal injury
‐
Use a suitable type of GFCI capable of handling earth fault currents with DC content (pulsating DC).
If the pump is connected to an electrical installation where a ground fault circuit interrupter (GFCI) is used for additional protection, this ground
Fault Circuit Interrupter shall be able to trip when ground fault currents with DC content occur.
If national legislation requires a Residual Current Device (RCD) or equivalent in the electrical installation, this must be type B or better, due to
the nature of the constant DC leakage current.
The residual-current circuit breaker must be marked like this:
Take into account the total leakage current of all the electrical equipment in the installation.

3.3.2 Wiring diagrams

Fig. Wiring diagrams for SQF

3.3.3 Motor protection

The product incorporates thermal protection against slow overloading and blocking. No external motor protection is required.
Related information
6.1.1 Built-in motor protection
3.3.4 Controllers for SQF pumps
You can connect SQF pumps to the following controller types:
• CIU 273
• CIU 903
• CU 200
• IO101
• IO102
• IO50.
3.3.5 Sizing the submersible drop cable
Before you install the pump, make sure to use the right cable size for the submersible drop cable.
The cross-section of the submersible drop cable must be large enough to meet the voltage requirements.
How to calculate the maximum cable length
If the power factor (PF) of the motor unit equals 1.0, you can use this equation to calculate the maximum cable length:
∙ ∆
=
∙ ∙ 2 100 ∙
12
N L