Tightening Torque - Wilo HC 20.1 + EMU FA Serie Manual De Instrucciones

en
13.1 Tightening torques
13.2 Operation with frequency con-
verter
192
Appendix
Rust-free screws A2/A4
Threaded

Tightening torque

Nm
5.5
M5
7.5
M6
18.5
M8
37
M10
57
M12
135
M16
230
M20
285
M24
415
M27
565
M30
Geomet-coated screws (strength 10.9) with Nord-Lock washer
Threaded 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 fre-
quency 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 reduction of the harmonic waves is achieved with output filters.
The frequency converter and filter 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. The
flow rate in the pipe must also be observed. If the flow rate is too low, the greater the
risk is of solids depositing in the pump and piping. A minimum flow rate of 0.7 m/s
(2.3 ft/s) with a pumping pressure of 0.4 bar (6 psi) is recommended.
It is important that the pump operates across the entire control range without vibra-
tions, resonance, oscillation or excessive noise. Increased motor noise caused by the
harmonics of the power supply is normal.
During parameterisation of the frequency converter, observe the setting of the quad-
ratic 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 requirement of the pump. Newer frequency converters feature an automatic
power optimisation function - this automation achieves the same effect. For the fre-
quency converter setting, refer to its installation and operating instructions.
Faults with the motor monitoring may occur on motors operated with a frequency con-
verter 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 overvoltages and rise speed.
Output filters may need to be installed.
▪ Vary the pulse frequency of the frequency converter.
kp m ft·lb
0.56 4
0.76 5.5
1.89 13.5
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
WILO SE 2019-01