Operation With Frequency Converter - Wilo HC 20.1+EMU FA Instrucciones De Instalación Y Funcionamiento

13.2 Operation with frequency con-
verter
Installation and operating instructions Wilo Motor HC 20.1 + EMU FA, Rexa SUPRA, Rexa SOLID
Appendix
Rust-free screws (A2/A4)
Thread Tightening torque
Nm
37
M10
57
M12
135
M16
230
M20
285
M24
415
M27
565
M30
Geomet-coated screws (strength 10.9) with Nord-Lock washer
Thread Tightening torque
Nm
9.2
M5
15
M6
36.8
M8
73.6
M10
126.5
M12
155
M16
265
M20
The motor in series design (confirming to IEC 60034‑17) can be operated with a frequency
converter. Contact customer service if the rated voltage is over 415 V/50 Hz or 480 V/60 Hz.
Because of the additional heating caused by harmonics, the rated power of the motor must
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. A reduc-
tion of the harmonic waves is achieved with output filters. The frequency converter and fil-
ter must be compatible.
The configuration of the frequency converter depends on the rated motor current. Care
must be taken to ensure that the pump operates without jerking or vibration, especially in
the lower speed range. Otherwise, the mechanical seals can leak or be damaged. Also con-
sider the flow rate in the pipe. If the flow rate is too low, the risk of solids depositing in the
pump and piping increases. A minimum flow rate of 0.7 m/s (2.3 ft/s) with a pumping pres-
sure of 0.4 bar (6 psi) is recommended.
It is important that the pump operates across the entire control range without vibrations,
resonance, oscillation or excessive noise. Increased motor noise caused by the harmonics of
the power supply is normal.
During parameterization of the frequency converter, observe the setting of the quadratic
pump curve (U/f curve) for pumps and fans! The U/f curve ensures that the output voltage at
frequencies less than the rated frequency (50 Hz or 60 Hz) is adjusted to the power require-
ment of the pump. Newer frequency converters feature an automatic power optimization
function - this automation achieves the same effect. For the frequency converter setting,
refer to its installation and operating instructions.
Faults with the motor monitoring may occur on motors operated with a frequency converter
depending on the type used and installation conditions present. The following measures can
help to reduce or avoid these faults:
▪ Keeping within the limit values stated in IEC 60034‑25 for the voltage peaks and rise speed.
Output filters may need to be installed.
▪ Vary the pulse frequency of the frequency converter.
kp m ft·lb
3.77 27.5
5.81 42
13.77 100
23.45 170
29.06 210
42.31 306
57.61 417
kp m ft·lb
0.94 6.8
1.53 11
3.75 27.1
7.51 54.3
12.90 93.3
15.81 114.3
27.02 195.5
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