Page 64 - IOM / ROOFTOP BALTIC Series - 0704 - E
Current
1
st
voltage
Input "Boost"
Over-current limit
Air sock
Inflation
30s (5s)
Acceleration 30s
FANSTART
off
VENTILaTION : FANSTART
The motor speed control is achieve through a variation of
the supply voltage of each phase at constant frequency.
The thermal overload limit on the motor imposes a current
limitation during the acceleration stage. Hence if the
selected slope is to steep, the predefined current limit can
be reached: flashing red LED, adjust the potentiometer P3
and the controller will automatically reduce the voltage set-
point accordingly. Then once the current is back under the
high current limit it carries on with the start up cycle.
The green LED switches off itself at the end of the
FANSTART operation.
AIR SOCK CONTROL
FANSTART Operation
The use of air socks for space conditioning allows high air
volumes to be distributed at low velocity and is becoming a
common feature in many applications. To accommodate
this trend, Air-sock control is offered which allows the air
socks to be progressively filled with air on start up. BALTIC
has been enhanced with an electronic device to soft start
the fan. It takes up to 1 minute to go from 0% of air to full air
flow.
This time can be divided in several stages:
- The aim of this first voltage input is to overcome the
resistance of the transmission (Pulleys and belts): 0.5s
and up to 100 rpm
- The second stage is to inflate the air sock: 5 to 30s. and
600 to 900 rpm
Finally the air sock is gradually pressurised during the last
5 to 30 second. The motor reaches nominal speed and the
controller is bypassed.
START-UP
Phase rotation check
If the phase rotation is incorrect the FANSTART Control will
display a fault ( Red LED). Two of the phases must then be
inverted and start again the start up cycle.
The FANSTART control can also display a fixed red
LED in two cases:
- Motor absent (6s)
- A phase is missing (6s)
Any adjustment of the FANSTART has to be done
power stopped.
This time is divided in several stages:
- The aim of this first voltage input is to "take
off belts from the pulleys": 0.5s ("BOOST")
- The second stage is to inflate the air sock:
during 30s with approximately half nominal speed
- Finally the air sock is gradually pressurised
during the last 30s. The motor reaches nominal
speed and the controller is shunted, the motor
being fed on line by the tension of the electrical
network.
Red LED
Green LED
P1: pre-inflation
P2: Acceleration
P1: Imax
Switch
PotentiometersMotor phases
Fig. 16
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