Personnel Qualifications; Operator Responsibilities; Direction Of Rotation Check (For Three-Phase Current Motors Only); Before Switching On - Wilo Rexa CUT GI Instrucciones De Instalación Y Funcionamiento

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:
Installation and operating instructions Wilo-Rexa CUT GI
Commissioning
– Float switches can move freely?
– Switching level tested (pump on, pump off, minimum
– Additional dry-running protection installed?
▪ Test operating conditions:
– Min./max. temperature of the fluid tested?
– Max. immersion depth tested?
– Operating mode defined depending on the minimum
– Maximum switching frequency adhered to?
▪ Check installation location/operating space:
– 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?
7.5

Switching on and off

During the start process, the rated current is temporarily
exceeded. During operation, the rated current may no
longer be exceeded. CAUTION! If the pump does not
start, switch off the pump immediately. Remove the
fault before reactivating the pump!
Place pumps which are installed as portable pumps on a
firm surface so they are level. If pumps have fallen over,
place them upright again before activating them. Se-
curely attach the pump with screws in case of difficult
surfaces.
Pumps with bare cable end
The pump must be switched on and off using a separate
operating point (on/off switch, switchgear) provided by
the customer.
Pump with attached plug
▪ Single-phase current version: After inserting the plug in
the socket, the pump is switched on.
7.6

During operation

water level)?
water level?
The hydraulics housing must be filled completely with
the fluid and there must be no air cushions in the hy-
draulics. NOTICE! Provide suitable venting devices if
there is a risk of air cushions being formed in the
system!
WARNING
Amputation of limbs due to rotating compon-
ents!
No persons must be present in the work area of the
pump! There is risk of (serious) injuries due to rotating
components! No persons must be present in the work
area of the pump during start-up or operation.
en
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