Commissioning; Personnel Qualifications; Operator Responsibilities; Direction Of Rotation Check (For Three-Phase Current Motors Only) - Wilo Rexa UNI Installation And Operating Instructions Manual

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 re-
commended to set the motor protection switch 5 %
above the current measured at the duty point. The fol-
lowing must also be observed:
▪ Power consumption must always be below the rated
current.
▪ 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 lack of protective equip-
ment!
Danger of (serious) injuries during work. Wear safety
shoes!
7.1

Personnel qualifications

▪ Electrical work: Electrical work must be carried out by a
qualified electrician (in accordance with EN 50110-1).
▪ Operation/control: Operating personnel must be in-
structed 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
available 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 oper-
ating conditions.
7.3 Direction of rotation check (for three-phase current
motors only)
The pump is factory-checked and adjusted to the cor-
rect direction of rotation for a clockwise rotating field.
Connection is made in accordance with the specifica-
tions in chapter "Electrical connection".
Installation and operating instructions Wilo-Rexa UNI
Commissioning
▪ Swap two phases for motors with direct starting.
▪ Swap the connections of two windings (e.g. U1/V1 and
7.4
▪ Check whether the device has been installed properly
▪ Check level control:
▪ Test operating conditions:
▪ Check installation location/operating space:
7.5
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:
U2/V2) for star-delta activation motors.

Before switching on

Check the following prior to activation:
and in accordance with the locally applicable regula-
tions:
– Has the pump been earthed?
– Layout of power supply cable tested?
– Electrical connection made properly?
– Mechanical components attached correctly?
– Float switches can move freely?
– Switching level tested (pump on, pump off, minimum
water level)?
– Additional dry-running protection installed?
– Min./max. temperature of the fluid tested?
– Max. immersion depth tested?
– Operating mode defined depending on the minimum
water level?
– Maximum switching frequency adhered to?
– Pipe system on the pressure side free of deposits?
– Inlet or pump sump cleaned or free of deposits?
– All gate valves open?
– Minimum water level defined and monitored?
The hydraulics housing must be filled completely
with the fluid and there must be no air cushions in
the hydraulics. NOTICE! Provide suitable venting
devices if there is a risk of air cushions being
formed in the system!

Switch on and off

During the start process, the rated current is temporar-
ily exceeded. During operation, the rated current may
en
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