Appendix; Tightening Torques; Operation With Frequency Converters - Wilo EMU FA Serie Instrucciones De Instalación Y Funcionamiento

APPENDIX

• Have a specialist inspect the connection and
correct it as necessary
6. Incorrect direction of rotation
• Replace two phases on the mains supply
7. Signs of wear
• Replace worn parts
8. Defective motor bearing
• Contact the manufacturer
9. The pump is installed under mechanical strain
• Check the installation, use expansion joints if
necessary
Fault: Leakage of the mechanical shaft seal,
sealing chamber monitor reports a fault or
shuts down the unit
1. Condensation build-up due to extended storage
and/or temperature fluctuations
• Operate the pump briefly (max. 5 min.) without
electrode
2. Increased leakage when running in new mechan-
ical shaft seals
• Change the oil
3. Defective electrode cables
• Replace the electrode
4. Mechanical shaft seal is defective
• Replace the mechanical shaft seal and contact
the manufacturer!
Further steps for troubleshooting
If the points listed here do not rectify the fault,
contact Wilo customer service. They can help you
as follows:
• Telephone or written support from Wilo customer
service
• On-site support from Wilo customer service
• Inspection or repair of the pump at the factory
Please note that you may be charged for some
services provided by our customer support.
For more details, please contact Wilo customer
service.
10. Appendix

10.1. Tightening torques

Stainless steel screws (A2/A4)
Thread
Nm
5.5
M5
7.5
M6
18.5
M8
M10
M12
135
M16
230
M20
M24 285
M27 415
M30 565
Installation and operating instructions Wilo-EMU FA+T-Motor
Tightening torque
kp m
0.56
0.76
1.89
37
3.77
57
5.81
13.76
23.45
29.05
42.30
57.59
Geomet-coated screws (strength 10.9) with Nord Lock
washer
Thread
Nm
M5 9.2
15
M6
36.8
M8
73.6
M10
126.5
M12
155
M16
265
M20

10.2. Operation with frequency converters

Any standard motor conforming to IEC 60034-17
can be used. If the rated voltage is above
415 V/50 Hz or 480 V/60 Hz, you must consult
the manufacturer. Because of the additional
heating caused by harmonics, the rated power of
the motor should be around 10 % more than the
power requirement of the pump. For frequency
converters with a low-harmonic output, it may be
possible to reduce the 10 % power reserve. This
is normally done by using output filters. Further-
more, the standard motors are not equipped
with shielded cables. The frequency converter
and filter must be synchronized with each other.
Ask the manufacturer.
The configuration of the frequency converter de-
pends on the rated motor current. Make sure that
the pump operates without jerking or vibrating,
especially in the lower speed range. Otherwise,
the mechanical shaft seals could be damaged and
start leaking. You must also consider the flow rate
in the pipe. The slower the speed, the greater the
risk of solids depositing in the pump and pipeline.
We recommend a minimum flow speed of 0.7 m/s
at a pumping pressure of 0.4 bar.
It is important that the pump operates across
the entire control range without vibrations,
resonance, oscillation or excessive noise (ask the
manufacturer if necessary). Increased motor noise
caused by the harmonics of the power supply is
normal.
When configuring the frequency converter, al-
ways make sure the quadratic curve (U/F charac-
teristic) for pumps and fans is correctly set! This
ensures that the output voltage at frequencies
less than the rated frequency (50 Hz or 60 Hz) is
adjusted to the power requirement of the pump.
Newer frequency converters feature an automatic
power optimization function which achieves the
same effect. For the frequency converter setting,
please refer to its installation and operating
instructions.
Faults with the motor monitor may occur on mo-
tors fed by a frequency converter depending on
the type used and installation conditions present.
The following general measures could help to
reduce or avoid faults:
Tightening torque
kp m
0.94
1.53
3.75
7.50
12.90
15.84
27.08
English
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