Ex Rating; Protection Class - Wilo EMU TR 212 Instrucciones De Instalación Y Funcionamiento

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-EMU TR/TRE 212 ... 326-3
Appendix
During parameterisation of the frequency converter, observe the setting of the quadratic
curve (U/f curve) for submersible motors! 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 mixer. More recent frequency converters feature an automatic power optimiza-
tion function - this automation achieves the same effect. For the frequency converter set-
ting, refer to the installation and operating instructions of the frequency converter.
Motor monitoring faults may occur if the motor is operated with a frequency converter. The
following measures can reduce or avoid these faults:
ƒ
Keeping within the limit values stated in IEC 60034‑25 for overvoltage and rise speed. If
necessary, install output filters.
ƒ
Vary the pulse frequency of the frequency converter.
ƒ
In the event of a fault in the internal sealing chamber monitoring, use the external dou-
ble-rod electrode.
The following construction measures can help to reduce or prevent faults:
ƒ
Separate connection cables for the main and control cable (depending on the motor size).
ƒ
Keep an adequate distance between main and control cable during routing.
ƒ
Use shielded connection cables.
Summary
ƒ
Min./max. frequency during continuous duty:
–
Asynchronous motors: 30 Hz up to rated frequency (50 Hz or 60 Hz)
–
Permanent magnet motors: 30 Hz up to the stated maximum frequency as per the
rating plate
NOTICE! Higher frequencies are possible following consultation with customer ser-
vice!
ƒ
Observe additional measures with regard to EMC regulations (choice of frequency con-
verter, using filters, etc.).
ƒ
Do not exceed the rated current or rated speed of the motor.
ƒ
Connection for 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:
ƒ
"Ex" symbol for the relevant approval
ƒ
Ex classification
ƒ
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:
ƒ
Flameproof enclosure (ATEX)
ƒ
Explosionproof (FM)
ƒ
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:
ƒ
Device group: II
ƒ
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:
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