en
14
Installation and operating instructions • Wilo-Rexa FIT-S • Ed.01/2022-03
6.5.4
Connection of the three-phase AC motor (3~ motor)
W 5
1
2
V 4
U 3
M 3~
gn-y
e
L3
L2
21
20
L1
PE
250 V (AC); 2,5 A
cos φ = 1
Fig. 7:
Connection diagram 3~ motor
Wire number
Name
Terminal
1
20
WSK
2
21
WSK
3
U
L1
4
V
L2
5
W
L3
Green/yellow (gn-ye) Earth
PE
•
Connection cable with bare cable ends.
•
Connection in the switchgear according to the connection dia-
gram.
•
Mains connection with clockwise-rotating field
•
Thermal motor monitoring:
–
Sensor: Bimetallic strip
–
Number of temperature circuits: 1, temperature limiter
–
Connection values: max. 250 V(AC), 2.5 A, cos phi = 1
–
Threshold value: is set by sensor.
–
Triggering status: If the threshold value is reached, switch
off the pump!
6.5.5
Optional equipment
Information on electrical accessory connection or possible special
configurations. Please refer to the order confirmation or configura-
tion overview for details on the special configuration.
6.5.5.1 Connection external pencil electrode
CAUTION
Trigger status for sealing chamber monitor-
ing
The pencil electrode detects water ingress into the
sealing chamber. The threshold value is reached
when a certain amount of water is present in the oil.
An alarm is triggered or the pump is switched off via
the evaluation relay:
• The pump may be a total loss if only an alarm oc-
curs.
• Recommendation: Always switch off the pump!
The connection must be made via an evaluation relay (e.g.
“NIV 101/A”):
•
Sensor: Electrode
•
Connection values: max. 250 V(AC), 2.5 A, cos phi = 1
•
Threshold: 30 kOhm
•
Triggering status: If the threshold value is reached, trigger the
alarm or switch off the pump!
6.5.6
Motor protection adjustment
6.5.6.1 Direct activation
•
Full load
Set the motor protection to the rated current according to the
rating plate.
•
Partial load operation
Set the motor protection to 5 % above the current measured at
the duty point.
6.5.6.2 Soft starter
•
Full load
Set the motor protection to the rated current according to the
rating plate.
•
Partial load operation
Set the motor protection to 5 % above the current measured at
the duty point.
Please observe the following points:
•
Current 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
NOTICE
Automatic activation after power cut
Depending on the process, the product is switched
on and off using separate controls. The product may
automatically switch on following power cuts.
7.1
Personnel qualifications
•
Operation/control: Operating personnel, instructed in the func-
tioning 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 instructions are
read and understood by all personnel.
•
All safety devices and emergency cut-outs on the system-side
must be active and checked to ensure that they work properly.
•
The pump is suitable for use under the specified operating con-
ditions.
7.3
Direction of rotation check for three-phase AC motor
The pump has been checked and adjusted to the correct direction
of rotation at the factory. To allow the correct direction of rota-
tion, a clockwise rotating field must be available at the mains con-
nection. The pump is
not
approved for operation with a counter-
clockwise rotating field!
