8
explosion-proof duct fan
WP-11/Ex
04.06.2019
Fig. No.5
– Nominal data plate and the plate of the Ex classification
The overload protection of the motor should feature such time-current characteristics that ensu-
res the motor disconnection from the supply in a time that is shorter than the
tE
time (as speci-
fied for the given motor), while the current equals the start-up current of the motor.
7.
Operational Use
In general, the construction and the reliable execution of the fan, guarantees its operational use
without constant routine maintenance. Nevertheless, check periodically the mechanical and ele-
ctrical connections, the state of grounding and efficient cooling for the motor.
Following use of the fan is treated as incorrect
:
a
)
conveying the aggressive media,
b
)
forwarding the media of high dustiness or contaminant particles content,
c
)
use of the fan in area where the ambient temperature of the
motor e40ºC.
Consequences of incorrect use
:
a
)
breakage of bearings,
b
)
damage caused by corrosion,
c
)
balance loss of the rotary elements,
d
)
vibrations,
e
)
deformations,
f
)
damages caused by friction.
Hazards caused due to incorrect use
– damages or other effects caused by:
● burst of the impeller,
● crack / burst due to wear of material,
● fire and explosion induced by sparks,
● vibrations,
In case when any defective device function is detected (e.g. increased noise level, vib-
rations, reduced flow efficiency), it is important to disconnect the fan from the power
supply, and to undertake its technical revision in order to reveal the reason of the func-
tional disturbance.
