8
9
Supply air unit VEKA
InStAllAtIon & MAIntEnAncE
Fläkt Woods
8514 GB 008.11
Subject to alteration.
Electric wiring of 3-phase motor
connection for fixed max speed
With this wiring method, the motor runs at maxi-
mum speed (direct mains connection). Control via,
for example, a clock or manual switch. The motor
has a thermal contact which acts as an overheating
cut-out between the internal connections T1 and T2.
The thermal contact ought to be connected to the start
contact’s control circuit. See diagram 1.
Electric wiring of -phase motor
By straight connecting of the motor it runs with maxi-
mum speed. The thermal overload relay needs to be
connected to the control circuit of the starting relay.
If the safety switch STVZ-66-2-1 is factory mounted
the connection is done according to diagram 2.
the start up of the unit
The unit is equipped with a sensor and manometer
connections for air volume measuring. The pressure
difference has to be measured and the corresponding
air flow is shown in the diagram. The motor should
not be overloaded by running air volume which are
outside the allowed range shown in the fan chart see
VEKA catalogue.
At max. speed the nominall current value stamped
on the motor plate may not be exceeded.
Please notice instructions shown in the installation
instructions and the brochure.
Guarantee terms do not cover damages caused by
neglections of instructions.
connecting the frequency inverter StRF
VEKA-20 and 30 with 3-phase motors can be speed
controlled with the loose supplied frequency inverter
STRF. The connection strap in the motor’s connec-
tion box should be set out as in diagram 3 before the
frequency inverter is connected. The connection of the
frequency inverter is then made as set out in the same
diagram. The frequency inverter should be connected
to 230 V 1-phase.
thermal cut-out/Alarm
The fan motors in the VEKA-20 and 30 are equipped
with an integrated thermal cut-out, which is connected
so that the fan stops when overheating. The cut-out
should also give an alarm. To be used in cases when
the fans are not controlled with frequency inverter.
STRF
Diagram . connection of frequency inverter StRF
Diagram 1. connection for max speed
Diagram . connection of -phase motor
