Buhler P2.x ATEX Serie Manual De Funcionamiento E Instalacion página 55

EPT.19.REL.01/56858
The motors are made of aluminium (the paint used has a maximum thickness of 0.2 mm) and have
separate parts: motor enclosure, terminal box for supply and capacitor enclosure (optional). The motors
are suitable for group IIC and group IIIC.
The motor enclosure has types of
All the parts of the flameproof enclosures have flameproof joints independent from each other.
The motors can be equipped with auxiliary devices (heaters, thermal protectors).
The anti-condensation heater can be activate only when the motor is not powered.
In case of single phase motors the capacitors have to be placed in the appropriate enclosure or in safe
zone.
Electrical characteristics
Mains Supply
Maximum rated voltage: 850 V
Maximum rated power: 30 kW
Rated frequency:
Insulation class:
Duty:
Poles:
Degree of protection:
Ambient temperature.
Temperature classes and Maximum surface temperature:
T5, T4, T3, T 125°C as a function of the ambient temperature and of the electrical characteristics (as
indicated in the technical note).
Inverter supply
Frequency range: 5-100 Hz
Possibility of supply through inverter exclusively with the use of thermal protectors applied on the
windings.
Such protectors may be either PTO and PTC and they shall be connected to an appropriate control
device conforming to EN 50495.
Activation temperature related to the temperature class:
90°C for temperature class T5;
130°C for temperature class T4;
150°C for temperature class T3.
Ventilation
The motors can be ventilated and not ventilated (with half power in respect to the ventilated
corresponding motors so to maintain a T3 temperature class with ambient temperature of 60°C or T4
temperature class with ambient temperature of 40°C).
Ventilation can be made by fan, who is fitted directly on the shaft, or by using an auxiliary motor.
The auxiliary motor belongs to O-M series. It will be a two poles 63 motor (for shaft height from 80 to 132)
or a two poles 71 motor (for shaft height from 160 to 180).
Impellors for Ex db motors, which have a peripheral speed below 50 m/s, are made of plastic material.
Impellors for Ex tb or Ex db tb or Ex db motors (which have a peripheral speed below 50 m/s) are made
of plastic dissipative material or metallic material.
The degree of protection (IP) of ventilation openings are:
- IP 20 on the air inlet side
- IP 10 on the air outlet side
IECEx Certificate of Conformity
50/60 Hz
F or H
S1, S2, S3, S9
2, 4, 6, 8, 2/4, 4/8, 4/6, 6/8
IP 66
-40 ÷ +40 °C (or +60°C for T3,T4 class of temperature)
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