Operation With Frequency Converter; Commissioning; Personnel Qualifications; Operator Responsibilities - Wilo Rexa UNI Einbau- Und Betriebsanleitung

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.
In the version with an attached plug, the thermal motor
monitoring is pre-wired and set to the correct value in
the plug.
6.5.6 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!
Installation and operating instructions Wilo-Rexa UNI
Commissioning
7.1

Personnel qualifications

▪ Electrical work: A qualified electrician must carry out the
electrical work.
▪ Operation/control: Operating personnel must be instruc-
ted in the functioning of the complete system.
7.2

Operator responsibilities

▪ Providing installation and operating instructions by the
pump or at a place specially reserved for it.
▪ Making the installation and operating instructions avail-
able in the language of the personnel.
▪ Making sure that the installation and operating instruc-
tions are read and understood by all personnel.
▪ All safety devices and emergency cut-outs on the sys-
tem-side must be active and checked to ensure that
they work properly.
▪ The pump is suitable for use under the specified operat-
ing conditions.
7.3 Direction of rotation check (for three-phase current
motors only)
The pump is factory-checked and adjusted to the correct
direction of rotation for a clockwise rotating field. Con-
nection is made in accordance with the specifications in
chapter "Electrical connection".
Direction of rotation check
A qualified electrician checks the rotating field at the
mains connection with a rotating field-test device. For
the correct direction of rotation, a clockwise rotating
field must be available at the mains connection. The
pump is not approved for operation with a counter-
clockwise rotating field! CAUTION! If the direction of
rotation is checked with a test run, comply with the
ambient and operating conditions!
Incorrect direction of rotation
If the direction of rotation is incorrect, change the con-
nection as follows:
▪ Swap two phases for motors with direct starting.
▪ Swap the connections of two windings (e.g. U1/V1 and
U2/V2) for star-delta activation motors.
7.4

Before switching on

Check the following prior to activation:
▪ Check whether the device has been installed properly
and in accordance with the locally applicable regulations:
– Has the pump been earthed?
– Layout of power supply cable tested?
– Electrical connection made properly?
– Mechanical components attached correctly?
▪ Check level control:
en
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