7.1
Safety notes
HAZARD
Hazard of explosion of an ignition-capable gas/air atmosphere!
If the wire ends which have not been connected are fitted to the external current circuits within the
explosion-capable area, a connection box selected to match this area with its own certification and
explosion-protection identification must be used.
The electrical data, information on temperature monitoring and on admissible operation with part
voltage, if applicable, can be seen from the data sheet in question.
The control devices and motor protection devices must be installed outside the explosion-capable area!
Operation on frequency inverters is only admissible for devices with the „Pressure-proof encapsulation
Ex d“ ignition protection class.
WARNING
Risk from electrical voltage!
›
Electrical connection only by a trained electrician or trained and instructed qualified personnel!
›
Electrical connection in harmony with the valid directives.
›
Avoid penetration of water into the terminal box.
›
Pay attention to the 5 rules of electrical engineering:
–
clear (all-pole separation of an electrical system from live parts),
–
secure against switching on again
–
establish freedom from voltage,
–
earth and short-circuit,
–
cover or fence off neighbouring live parts.
"
Do not use gland bolt connections of metal if the terminal boxes are of plastic.
"
Always connect the thermo-contacts to a motor protection device!
–
The motors contain triple posistors. More than two posistor chains may not be switched in series. Maximum test
voltage of the posistors 2.5 V.
–
The motor can overheat and be destroyed if the thermo-contacts have not been connected.
"
Ground all conductive added and accessory parts.
7.2
AW-EX, AXC-EX and AXCBF-EX axial fans
"
Connect the lines according to the connection diagram in the lid of the connection box. The electrical data can be
seen from the name plate or the enclosed data sheet.
Ex motors additionally have a marked external posistor connection.
"
Earth the fan on the earth conductor connection.
"
AW-EX: If the operational leakage current of 3.5 mA is exceeded, the conditions with a view to grounding pursuant
to DIN VDE 0160/5.88 Art.6.5.2.1 are to be fulfilled.
"
Connect the thermo-contacts/posistor connections to a motor protection device.
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.
Electrical connection
59
