IMO AXC 2014 04
6 Safety devices
The motors have been provided with thermal protection via resistors (PTC) as a standard.
Provision with thermocontacts is possible if required by the customer.
The smoke exhaust versions (B) and (F) are provided without any thermal protection.
7 Constructional set-up
These fans are directly powered axial fans, in which the motor is positioned directly in the air ow.
The main air direction is suctioned across the motor.
The outside of the fans is formed by a tubular housing of galvanized steel sheet, which has a ange with
bores according to eurovent 1/2 standard pressed on both sides.
The axial impeller comprises an aluminium cast alloy and have proled blades and an efcient hub ratio.
Directly powered axial fans are arranged with the motor inside the air ow.
In B3 conventional motors, the motorbearing console is of galvanized steel sheet. In B30 pad mounted mo-
tors, the motor is tted on the housing via threaded rods or a welded motor support.
As a default, the fans are provided with three phase motors (400 V, 50 Hz) with integrated resistor. The elec-
trical motor protection class is at least IP 54, ISO F.
The fans can be run in permanent operation from –20 °C to 55 °C ambient and conveying temperature.
The hub construction permits innite adjustment of the blade angle at a standstill. The dynamic counterbalan-
cing is done according to ISO 1940 T1, Class G 6.3.
The electrical connection is via a terminal box positioned on the outside of the housing, the motor connec-
tions are carried out in the factory.
The standard motors of the axial fans are suited for operation with a frequency inverter.
If the fans are controlled with a frequency inverter, connection of the thermal protection, resistor (standard
PTC) or also thermocontacts (TC) in the motor is necessary.
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AX - 01.2013
Axial, smoke and heat exhaust fans, series AX