Terminal Block - Grundfos LC 241 Instrucciones

4. Connect the power cables and pump cables according to the
relevant electrical diagram, including the cables from the motor
temperature and moisture sensor, if any. Tighten the terminal
screws to the correct torque. See table.
Note that all wires must be secured inside the cabinet using
cable ties. All cable glands must be mounted and
plugged, even if they are not in use, to ensure the correct IP
protection level.
Remember to remove the jumper from the PTC terminal if you
are connecting cables from the temperature sensor to the PTC
terminals.
Lead the wires through the left side of the cable tray. See
appendix A for examples.

Terminal block

Pump contactor
Power supply
Cable glands
Connecting a wire to a terminal with spring clamps
5. In case there is only a PTC sensor present in the pump, the
two wires from the PTC sensor have to be connected directly to
the PTC terminals.
6. In cases where PTC and moisture sensors are present, you
end up with three wires: a PTC wire, a moisture sensor wire
and a common wire. Connect only the PTC wire and the
moisture sensor wire. The common wire must be isolated. In
Grundfos GO Remote, you must select that both the PTC wire
and the moisture sensor wire are connected, and select a cool-
down time for the thermal protection.
1
2
PTC connection
Pos. Description
1 PTC/Klixon sensors
2 Moisture sensors
Torque [Nm]
1.2 - 1.5
1.2 - 1.5
2.5
PTC1/PTC2
PTC1/PTC2
Protective
PTC2 Earth
2Z2
2N2
2U2
PTC1
1Z2
1N2
1U2
N
L
Fuse Terminal
Run Capacitor
Recommended PTC wiring
Example:
Contactor
Overload
Relay
Protective Earth
Three-phase connections for two pumps
Pump#2
Pump#1
Mains
IO242
Contactor
Overload
Relay
9