Specifications

6.1.11 Fixed Variable Speed Pump Wiring
Diagram
L1/L2/L3 L1/L2/L3 L1/L2/L3
Power Section
RELAY 1 RELAY 2
130BA376.10
Illustration 6.9 Fixed Variable Speed Pump Wiring Diagram
6.1.12 Lead Pump Alternation Wiring
Diagram
130BA377.13
L1/L2/L3
FC
L1/L2/L3
L1/L2/L3
k3
k2
k3
k1
K2
K1
K1
K1
K4
K3
K4
K3
R1 R2
Illustration 6.10 Lead Pump Alternation Wiring Diagram
Every pump must be connected to 2 contactors (K1/K2 and
K3/K4) with a mechanical interlock. Apply thermal relays or
other motor protection devices 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-energised, the first built in
relay to be energised cuts in the contactor
corresponding to the pump controlled by the
relay.
•
K1 blocks for K2 via the mechanical interlock
preventing mains to be connected to the output
of the frequency converter (via K1).
•
Auxiliary break contact on K1 prevents K3 to cut
in.
•
RELAY 2 controls contactor K4 for on/off control
of the fixed speed pump.
•
At alternation both relays de-energise and now
Relay 2 is energised as the first relay.
Application Examples VLT® HVAC Drive FC 102 Design Guide
160 MG16C102 - Rev. 2013-08-20
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