
6.1.11 Fixed Variable Speed Pump Wiring Diagram
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.
•
When all relays are de-energized, the first built in relay to be energized will cut in the contactor corresponding to the pump controlled by the
relay. E.g. RELAY 1 cuts in contactor K1, which becomes the lead pump.
•
K1 blocks for K2 via the mechanical interlock preventing mains to be connected to the output of the frequency converter (via K1).
6 Application Examples
Automation VT Drive FC322 Design Guide
194
MG.20.X1.22 - VLT
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