Rvk-Ex Duct Fans; Dvex Roof Fans; Cut-Out Time Of The Motor Protection Device; Secure 3-Phased Motors - Systemair Aw 355 D4-2-Ex Montage- Und Betriebsanleitung

For the AW-EX series, please remember
 Seal the screw connections on lids of plastic terminal boxes with sealing putty.
 Depending on the kind of cable insert, provide water discharge bends or use sealing putty.
 Fit the fan connection wire with cable binders on the contact protection grid or the motor struts.
7.3

RVK-EX duct fans

 Connect the lines according to the connection diagram on the stator or fan housing. The electrical data can be seen
from the name plate or the enclosed data sheet.
Ex motors additionally have a marked external earth conductor connection.
 Earth the fan on the earth conductor connection.
 Connect the thermo-contacts/posistor (DIN 44082-M130) connections to a motor protection device.
 In cases of higher strain (e.g. moist rooms), provide for a cable insert with water discharge bends.
 Additionally seal the compression gland screw connection.
 Fit the motor connection wire with cable binders or cable clamps.
7.4

DVEX roof fans

The wire ends of the fan must be installed such that they are mechanically protected and are suited for use outdoors.
In the event of external connection of the earthing wire, connect it securely to the house earthing device between two
metal panels.
Installation must be done according to Directive EN 60079-14 in harmony with the high voltage directives.
 Connect the lines according to the connection diagram in the lid of the terminal box. The electrical data can be seen
from the name plate or the enclosed data sheet.
Ex motors additionally have a marked external earth conductor connection.
 Earth the fan on the earth conductor connection.
 If there is an increased risk of static charge, a separate earthing should be connected to the housing.
 Connect the thermo-contacts/posistor connections to a motor protection device.
7.5

Cut-out time of the motor protection device

•
Determine the cut-out time of the motor protection device. It is the ratio of start current and nominal current (IA/IN).
The ratio must be between 2.9 and 8 at an ambient temperature of 20°C.
•
In selection, the admissible chosen current limitation may not deviate by more than 20%.
•
The motor protection switches must be designed such that the start current does not trigger the protection switches.
• Connect a motor protection switch (e.g. U-EK230E). It has been fi tted with a light-emitting diode which lights up
when the motor protection is triggered.
NOTE
The motor protection device must be installed such that it protects the motor against overheating and
cuts out within 15 sec. if the rotor blocks.
7.6

Secure 3-phased motors

Avoiding two-phased runs:
For 3-phased motors, use an effective motor protection, we recommend an all-pole C automatic cut-out.
7.7

Connect temperature monitor

If a temperature monitor is used, it must be connected to a motor protection device.
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