Ex Rating - Wilo Flumen OPTI-TR 20-1 Instrucciones De Instalación Y Funcionamiento

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13.3

Ex rating

13.3.1 Identification of Ex-rated mixers
13.3.2 Protection class
13.3.3 Intended use
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Appendix
tant that the mixer 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
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 automatic power
optimization function - this automation achieves the same effect. For the frequency con-
verter 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.
▪ 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.
▪ Use 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 converter,
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 monitor (bimetallic strip or PTC
sensor).
This section contains further information on the operation of the mixer in an explosive at-
mosphere. All personnel must read this section. This section applies only to Ex-rated mix-
ers!
For use in explosive atmospheres, the mixer must be marked as follows on the rating plate:
▪ "Ex" symbol for the relevant 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). A temperature controller (2‑circuit
temperature monitoring) is possible.
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:
WILO SE 2019-01