Appendix
en
Installation and operating instructions Wilo-EMU TR/TRE 50-2 ... 120-1
45
Rust-free screws A2/A4
Threaded
Tightening torque
Nm
kp m
ft·lb
M12
57
5.81
42
M16
135
13.77
100
M20
230
23.45
170
M24
285
29.06
210
M27
415
42.31
306
M30
565
57.61
417
If a Nord-Lock screw locking device is used, increase the tightening torque by 10 %!
13.2
Operation with frequency con-
verter
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 mixer. For
frequency converters with a low-harmonic output, it may be possible to reduce the
10 % power reserve. Harmonic waves are reduced by means of output filters. The fre-
quency 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 mixer operates without jerking or vibrating, especially
in the lower speed range. Otherwise, the mechanical seals can leak or be damaged. It is
important that the mixer operates across the entire control range without vibrations,
resonance, oscillation or excessive noise. Increased motor noise caused by the harmon-
ics of the power supply is normal.
During parameterisation of the frequency converter, observe the setting of the quad-
ratic curve (U/f curve) for submersible motor 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 mixer. Newer frequency converters feature an auto-
matic power optimisation 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 con-
verter depending on the type used and the installation conditions. The following meas-
ures can help to reduce or avoid these faults:
ƒ
Keeping within the limit values stated in IEC 60034‑25 for overvoltages and rise
speed. Output filters may need to be installed.
ƒ
Vary the pulse frequency of the frequency converter.
ƒ
In the event of a fault on the internal sealing chamber control, use the external
double-rod electrode.
The following construction measures can also help to reduce or prevent faults:
ƒ
Separate power supply cables for the main and control cable (depending on the mo-
tor size).
ƒ
When laying, ensure there is adequate clearance between the main and control
cable.
ƒ
Using shielded power supply cables.
Summary
ƒ
Continuous duty up to rated frequency (50 Hz or 60 Hz).
ƒ
Observe additional measures with regard to EMC regulations (choice of frequency
converter, using filters, etc.).
ƒ
Never exceed the rated current or rated speed of the motor.
ƒ
It must be possible to connect the motor’s own temperature monitoring (bimetallic
strip or PTC sensor).
13.3
Ex rating
This section contains further information on the operation of the mixer in an explosive
atmosphere. All personnel must read this section.
This section applies only to Ex-rated
mixers!
