Wilo Flumen OPTI-TR 28-1 Einbau- Und Betriebsanleitung Seite 317

13.3 Ex rating
13.3.1 Identification of Ex-rated mixers
13.3.2 Protection class
13.3.3 Intended use
Installation and operating instructions Wilo-Flumen OPTI-TR 20-1, 28-1, 30-1, 40-1 Wilo-Flumen EXCEL-TRE 20, 30, 40
Appendix
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:
▪ 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.
▪ 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:
▪ Separate power supply cables for the main and control cable (depending on the motor
size).
▪ When laying, ensure there is adequate clearance between the main and control cable.
▪ Using shielded power supply cables.
Summary
▪ Continuous duty up to rated frequency (50 Hz or 60 Hz).
▪ Observe additional measures with regard to EMC regulations (choice of frequency con-
verter, using filters, etc.).
▪ Never exceed the rated current or rated speed of the motor.
▪ It must be possible to connect the motor's own temperature monitoring (bimetallic
strip or PTC sensor).
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!
For use in explosive atmospheres, the mixer must be marked as follows on the rating
plate:
▪ "Ex" symbol of the corresponding approval
▪ Ex classification
▪ Certification number (depending on the approval)
The certification number, if required by the approval, is printed on the rating plate.
The motor's design version corresponds to the following protection classes:
▪ Flameproof enclosure (ATEX)
▪ Explosionproof (FM)
▪ Flameproof enclosures (CSA-EX)
In order to limit the surface temperature, the motor must be equipped with at least one
temperature limiter (1‑circuit temperature monitoring). It may also be equipped with a
temperature controller (2‑circuit temperature monitoring).
ATEX approval
The mixers are suitable for operation in potentially explosive atmospheres:
▪ Device group: II
▪ Category: 2, zone 1 and zone 2
Mixers must not be used in zone 0!
FM approval
The mixers are suitable for operation in potentially explosive atmospheres:
▪ Protection class: Explosionproof
▪ Category: Class I, Division 1
Notice: If the cabling is carried out according to Division 1, installation in Class I, Divi-
sion 2 is also permitted.
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