Grundfos DMX 221 Installations- Und Bedienungsanleitung Seite 58

• Single-phase VFD variant: connect phase line (L1) to L1, neutral line (N) to L2/N, pro-
tective earth (PE) to PE.
• Three-phase VFD variant: connect phase lines (L1, L2, L3) to L1, L2/N and L3, protec-
tive earth (PE) to PE.
L3 L2/N L1 PE
Fig. 11.2.2-2 Mains connection of the VFD
Tighten the screws with 0.5 - 0.6 Nm.
6. Tighten the cable gland.
7. Refit the front cover of the VFD power unit and tighten the screws.
Tighten the screws with 3.5 Nm ± 20 %.
Related information
• 3.1 Preparing the pump for startup
• 11.2.5 Technical data of DMX pumps with VFD
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