Grundfos LC 231 Manual Del Usuario página 8

2.3.3 Connecting the pump supply and power
supply
DANGER
Electric shock
Death or serious personal injury
‐
If national legislation requires a
Residual-Current Device (RCD) or
equivalent in the electrical installation,
this must be of at least type A, due to
the nature of the constant DC leakage
current.
WARNING
Electric shock
Death or serious personal injury
‐
Switch off the power supply before
making any electrical connections.
Make sure that the power supply
cannot be switched on accidentally.
‐
Remember to indicate where the main
switch is located by placing a label or
similar in the control unit.
‐
Make sure that the voltage between
the phase and neutral does not exceed
250 VAC.
‐
Electrical connections must be carried
out according to wiring diagrams.
The wires from the temperature sensor, if
any, must be shielded.
The residual-current circuit breaker must be marked
like this:
Take into account the total leakage current of all the
electrical equipment in the installation.
1. Check that the supply voltage and frequency
correspond to the values stated on the
nameplate.
2. Cut the power supply and pump supply cables as
short as possible.
3. Before switching the power on, check all voltages
with a multimeter and ensure that the voltage
between neutral and each phase does not
exceed 250 VAC.
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.
8
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 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 terminal.
Terminal block
Pump contactor
Power supply
Connecting a wire to a terminal with spring
clamps
5. Tie the pump phase cable(s) to the protection
cover with cable ties.
Example:
T1 T2 T3
L1 L2 L3 N N N
L N PE
M
Single-phase connections for one pump
Related information
6.15.4 Setting the motor protection with Grundfos
GO Remote
8.2 Code 2 (Power phase missing)
8.4 Code 9 (Power phase sequence wrong)
Torque [Nm]
1.2
1.2
EARTH A B
PE
PTC1