Fixed Variable Speed Pump Wiring Diagram; Lead Pump Alternation Wiring Diagram - Danfoss VLT HVAC Design Manual

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VLT HVAC Drive Design Guide 6 Application Examples

6.1.11 Fixed Variable Speed Pump Wiring Diagram

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6.1.12 Lead Pump Alternation Wiring Diagram

Every pump must be connected to two contactors (K1/K2 and K3/K4) with a mechanical interlock. Thermal relays or other motor protection devices must
be applied according to local regulation and/or individual demands.
• RELAY 1 (R1) and RELAY 2 (R2) are the built-in relays in the frequency converter.
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MG.11.B9.02 - VLT ® is a registered Danfoss trademark