Commissioning - Wilo Rexa CUT GI-Serie Einbau- Und Betriebsanleitung

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6.5.4 Three-phase current motor connection
PE L1
M 3~
Fig. 8: Connection diagram three-phase current motor
Wire number Designation
1 20
2 21
3 U
4 V
5 W
Green/yellow (gn-ye) Earth
The three-phase current version is equipped with bare
cable ends. Connection to the mains is established by
connecting the power supply cable in the switchgear.
Electrical connection must always be carried out by a
qualified electrician!
For the correct direction of rotation, a clockwise rotating
field must be available.
NOTICE! The individual wires are designated according
to the connection diagram. Do not cut the wires! There
is no additional assignment between the wiring dia-
gram and connection diagram.
6.5.5 Monitoring device connection
All monitoring device must be connected!
6.5.5.1 Monitoring of motor winding
Single-phase current motor
Thermal motor monitoring is self-switching for single-
phase current motors. The monitoring function is always
active and does not need to be connected separately.
Three-phase current motor with bimetallic strip
Bimetallic strips are directly connected to the switchgear
or via an evaluation relay.
Connection values: max. 250 V (AC), 2.5 A, cos φ = 1
When the threshold is reached, deactivation must take
place.
104
L2 L3 20 21
Terminal
WSK
WSK
L1
L2
L3
PE

Commissioning

In the version with an attached plug, the thermal motor
monitoring is pre-wired and set to the correct value in
the plug.
6.5.5.2 Sealing chamber monitoring (external electrode)
Connect the external electrode via an evaluation relay.
Relay "NIV 101/A" is recommended for this. The
threshold is 30 kOhm.
Once the threshold is reached, a warning must be out-
put or the unit must be switched off.
CAUTION
Connection of the sealing chamber control
If on reaching the threshold, there is only a warning,
the pump could be irreparably damaged by the water
ingress. Deactivation of the pump is always recom-
mended!
6.5.6 Motor protection adjustment
Motor protection must be set depending on the selected
activation type.
6.5.6.1 Direct activation
At full load, set the motor protection switch to the rated
current (see rating plate). At partial load, it is recommen-
ded to set the motor protection switch 5 % above the
current measured at the duty point.
6.5.6.2 Soft starter
At full load, set the motor protection switch to the rated
current (see rating plate). At partial load, it is recommen-
ded to set the motor protection switch 5 % above the
current measured at the duty point. The following points
must also be observed:
▪ Power consumption must always be below the rated cur-
rent.
▪ Complete starting and stopping within 30 s.
▪ To avoid power dissipation, bypass the electronic starter
(soft start) once normal operation is reached.
6.5.7 Operation with frequency converter
Operation on the frequency converter is not permitted.
7 Commissioning
WARNING
Foot injuries due to a lack of protective equip-
ment!
Danger of (serious) injuries during work. Wear safety
shoes!
WILO SE 2019-02