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Installation and operating instructions • Wilo-Rexa FIT-S • Ed.01/2022-03

13

6.4.6

Dry-running protection

Dry-running protection prevents the pump from being operated
without fluid and air from entering the hydraulics. For this purpose,
the minimum permissible fill level is monitored using an external
control. When the minimum fill level is reached, the pump is
switched off. Furthermore, depending on the control, a visual and
acoustic alarm is triggered.

The dry-running protection can be integrated into existing con-
trols as an additional measuring point. Alternatively, the dry-run-
ning protection can also work as a stand-alone shut-off device.
Depending on the system security, the pump can be restarted au-
tomatically or manually.

Installation of dry-running protection is recommended for op-
timum operational reliability.

6.5

Electrical connection

DANGER

Risk of fatal injury due to electrical current!

Improper conduct when carrying out electrical work
can lead to death due to electric shock!

• Electrical work must be carried out by a qualified

electrician!

• Observe local regulations!

Mains connection corresponds to the information on the rating
plate.

Power supply on mains side with clockwise rotating field for
three-phase AC motors (3~ motor).

Route the connection cables according to the local regulations
and connect them according to the wire assignment.

Connect 

all

 of the monitoring devices and check their function.

Secure the earthing in accordance with the local regulations.

6.5.1

Fuse on mains side

Circuit breaker

The size and switching characteristics of the circuit breakers must
conform to the rated current of the connected product. Observe
local regulations.

Motor protection switch

Make provision for an on-site motor protection switch for devices
without a plug! The minimum requirement is a thermal relay/motor
protection switch with temperature compensation, differential
triggering and anti-reactivation device in accordance with the local
regulations. In case of sensitive mains, make provision for the in-
stallation on-site of other protective equipment (e.g. overvoltage,
undervoltage or phase failure relay, etc.).

Residual-current device (RCD)

Install a residual-current device (RCD) in accordance with the
regulations of the local energy supply company.

If people can come into contact with the device and conductive
fluids, install a residual-current device (RCD).

6.5.2

Maintenance tasks

Check the insulation resistance of the motor winding.

Check the resistance of the temperature sensors.

6.5.2.1 Checking the insulation resistance of the motor wind-

ing

Insulation tester 1000 V

Motors with 

capacitor

: Short-circuited windings!

1.

Check the insulation resistance.

Measured value at initial commissioning: ≥ 20 MΩ.

Measured value at interval measurement: ≥ 2 MΩ.

Insulation resistance checked. If the measured values devi-
ate from the specifications, consult the customer service.

6.5.2.2 Test the resistor of the temperature sensor

Ohmmeter available.

1.

Measure the resistance.

Measured value 

Bimetallic strip

: 0 ohms (passage).

Resistance checked. If the measured value deviates from
the specification, consult the customer service.

6.5.3

Connection single-phase AC motor (1~motor)

bn

bu

Cr

C s

M 1~

gn-y

e

U1/Z1

bn

U2 bk

Z2 gy

gn-y

e

L

N

PE

Fig. 6: 

Connection diagram 1~ motor

Wire colour

Terminal

Brown (bn)

L

Blue (bu)

N

Green/yellow (gn-ye) Earth

The pump is equipped with a plug (CEE 7/7). Connection to the
mains is established by inserting the plug into the socket (type E or
type F). The plug is not watertight.

Bimetallic strips are installed in the motor in addition to the capa-
citor box for thermal motor monitoring. The motor monitoring is
self-switching. Separate connection is not possible.

If the pump is directly connected to the switchgear, cut off the
plug. Connect the connection cable according to the connection
diagram in the switchgear.

Summary of Contents for Rexa FIT-S

Page 1: ...Pioneering for You Wilo Rexa FIT S 6092602 Ed 01 2022 03 en Installation and operating instructions...

Page 2: ...Rexa FIT S http qr wilo com 414 Rexa FIT https qr wilo com 771...

Page 3: ...ials 9 5 3 Technical data 10 5 4 Type key 10 5 5 Scope of delivery 10 5 6 Accessories 10 6 Installation and electrical connection 10 6 1 Personnel qualifications 10 6 2 Installation types 10 6 3 Opera...

Page 4: ...ent Non compliance with these instructions Improper use Incorrect storage or transport Incorrect installation or dismantling Insufficient maintenance Unauthorised repairs Inadequate construction site...

Page 5: ...them during use of the product supervisor Persons with limited physical sensory or mental capacities Use of this product is pro hibited 2 3 Personal protective equipment The protective equipment spec...

Page 6: ...quipment e g overvoltage undervoltage or phase failure relay etc Residual current device RCD Install a residual current device RCD in ac cordance with the regulations of the local en ergy supply compa...

Page 7: ...et and pressure pipe Ensure minimum water submersion by using dry running protection Sound pressure level depends on several factors installation duty point etc Measure the current noise level under o...

Page 8: ...ied to the transport company or the man ufacturer on the day of receipt of shipment Subsequently notified defects can no longer be asserted 3 2 Transport CAUTION Soaked packaging may tear The product...

Page 9: ...contents e g sand gravel Intended use also includes compliance with this manual Any other use is regarded as non compliant with intended use 5 Product description 5 1 Description Fully submersible gri...

Page 10: ...y for rated voltage P Additional electrical equipment O with bare cable end P with plug CEE 7 7 A with float switch and plug CEE 7 7 5 5 Scope of delivery Pump Installation and operating instructions...

Page 11: ...le length are sufficient for the selected installation type Installation of switchgear Observe information in the manufac turer s instructions IP class overflow proof potentially explos ive atmosphere...

Page 12: ...ace If the pump is used at the same location for a longer period of time bolt the pump support foot to the floor This reduces vi brations and enables quiet operation 1 6 5 3 4 2 OFF S1 S2 S3 Fig 5 Por...

Page 13: ...l relay motor protection switch with temperature compensation differential triggering and anti reactivation device in accordance with the local regulations In case of sensitive mains make provision fo...

Page 14: ...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 m...

Page 15: ...nding on the fill level ON OFF Switch the pump on and off in operating mode HAND Pump with attached plug Single phase AC version 1 motor Insert the plug into the socket the pump is ready for operation...

Page 16: ...rotect the pump from frost and ice Minimum fluid temperature 3 C 37 F 1 Switch off the pump 2 Secure the operating point against being switched on again by unauthorised persons e g lock main switch Th...

Page 17: ...equipment to the attachment point on the pump 3 Lift the pump approximately 30 cm 10 in above the ground 4 Spray the pump with clean water from top to bottom 5 Guide the water jet inwards through the...

Page 18: ...remain constant Slight fluctu ations depend on the characteristics of the fluid Power consump tion can provide an early indication of damage or malfunctions in the impeller bearings or motor which can...

Page 19: ...customer service 8 Pour in operating fluid Rotate the pump until the opening points upwards Pour the operating fluid into the opening Comply with the specifications for the operating fluid type and qu...

Page 20: ...Wet fastening screw with thread locking fluid and screw it into cutting head Tighten the fastening screw hand tight 7 Secure the cutting head Insert wedge between cutting head and cutting plate CAUTIO...

Page 21: ...r cushion in the pipe system Vent the pipe system If air cushions occur frequently Locate and prevent the air intake if required install ventilation systems at specified locations 6 Pump pumping again...

Page 22: ...ent and putting your personal health at risk NOTICE Disposal in domestic waste is prohibited In the European Union this symbol may be included on the product the packaging or the accompanying document...

Page 23: ......

Page 24: ...Pioneering for You Local contact at www wilo com contact WILO SE Wilopark 1 44263 Dortmund Germany T 49 0 231 4102 0 T 49 0 231 4102 7363 wilo wilo com www wilo com...

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