3
5.3 Wiring
The power supply cable must be fitted
according to national regulations and
meet the EMC regulation.
The connection must be done by author-
ised personnel. The motor is connected
through a thermal relay based on motor
nominal current. The connection is ef-
fected directly in the switch mounted in
the terminal box. Please note AUT, ART
and AZT have external terminal boxes.
Check if current legislation prescribes in-
stallation of f.x. an emergency stop.
See figures 4a, 4b, 4c and 4d for connec-
tions. Refer also to the motor nameplate
and the order specification.
5.3.1 Access to terminals or terminal
box (AUO and ARO)
• Remove screw in handle, item 1
• Remove handle, item 2
• Unscrew screws in cover, item 3
• Remove cover, item 4.
Note:
The switch can be used as safety
isolator.
5.4 Before service
5.4.1 Locking of switch on AUO and
ARO
It is recommended to lock the switch in
the Off position during maintenance.
Use a padlock to prevent turning of the
handle.
The switch can be locked in the On or Off
positions by removing the little plastic
stick opposite the locking position.
To remove the stick; dismount the han-
dle, cut the stick off with a cutter and re-
mount the handle.
5.4.2 Switching off power supply
The power supply for the units must be
switched off centrally. The control
switches must be disconnected and se-
cured, before servicing the units.
5.5 Approval for operation
The installation must be approved with
regard to operation and interaction. The
person responsible for the operation of
the system must initiate this test.
The approval test must be confirmed.
The person responsible for the operation
of the system must keep the approval
test documents. For jet fans approved for
smoke control, the documents must be
presented upon request from authori-
ties.
Check that the fans are clean and free
from tools, before start of operation. The
rotors must rotate freely. Make sure the
electric connections meet the national re-
quirements, and that the wire guards on
the suction sides and guide vanes on the
pressure sides are correctly mounted.
To check direction of airflow and direc-
tion of rotation, briefly switch the fans on
then off. Refer to the arrow plates on the
fan casings.
In the first 30 minutes of operation, the
motors may use more power than stated
on the motor plate. This is the running-
in period. The amperage depends
among other things on the temperature.
Figure 4a.
Connection diagram in terminal
box
Figure 4b.
Switch for AUO and ARO for both
standard and 300 °C (optional)
Figure 4c.
Connection diagram for AUO and
ARO (Connect ground to ground screw)
T
w
o speed
(Dahlander)
Max. r/min
Min. r/min
Low speed
High speed
Figure 4d.
Connections in terminal box
Figure 5.
Access to terminals
Figure 6.
Switch locked in Off position
Low speed
High speed
Ground
L1 L2 L3
L1 L2 L3
1
2
3
4
Figure 7.
Removal of plastic stick for locking
in Off position
Figure 8.
Removal of plastic stick for locking
in On position
