6
TPM 075/09
Design .40, .50
FDMB is always equipped by electric actuating mechanism BLF(BF) 230-T or BLF(BF) 24-T
(further only "actuating mechanism"). After being connected to power supply AC/DC 24V or 230V,
the actuating mechanism displaces the damper blade into operation position "OPEN" and at the
same time it pre-stretches its back spring. When the actuating mechanism is under voltage, the
damper blade is in the position "OPEN" and the back spring is pre-stretched. Time needed for full
opening of the flap blade from the position "CLOSED" to the position "OPEN" is maximum
140 sec. If the actuating power supply is cut off (due to loss of supply voltage, activation of
thermoelectrical actuating mechanism or pushing the reset button on the thermoelectrical starting
mechanism BAE 72B-S), the back spring displaces the damper blade into the breakdown position
"CLOSED". The time of displacing the blade from the position "OPEN" to the position "CLOSED"
takes maximum 16 sec. In case that the power supply is restored again (the blade can be in any
position), the actuating mechanism starts to re-displace the damper blade into the position "OPEN".
A thermoelectrical starting mechanism BAE 72B-S, which contains two thermal fuses Tf1 and
Tf2/Tf3, is a part of the actuating mechanism. These fuses are activated when temperature
+72 °C has been exceeded (the fuse Tf1 when the temperature around the damper and the fuses
Tf2/Tf3 when the temperature inside the air-conditioning piping has been exceeded). After the
thermal fuse Tf1 or Tf2/Tf3 has been activated, the power supply is permanently and irreversibly
cut off and the actuating mechanism, by means of the pre-stretched spring, displaces the damper
blade into the breakdown position "CLOSED".
2.2.
Design with electric actuating mechanism
Fig. 11
Design with actuating mechanism
BAE 72B-S
BAE 72B-S
Tab. 2.2.1. Actuating mechanism BELIMO BLF 24-T(-ST), BLF 230-T
Actuating mechanism BELIMO
BLF 24-T(-ST)
BLF 230-T
Nominal voltage
AC 24 V 50/60 Hz
DC 24 V
AC 230 V 50/60 Hz
Power consumption - motoring
- holding
5 W
2,5 W
5 W
3 W
Dimensioning
7 VA (Imax 5,8 A @ 5 ms)
7 VA (Imax 150 mA @ 10 ms)
Protection class
III
II
Degree of protection
IP 54
Running time - motor
- spring return
40..75 sec
~ 20 sec
Ambient temperature
- normal duty
- safety duty
- non-operating temperature
- 30 °C … + 50 °C
The safe position will be attained up to max. 75°C
- 40 °C … + 50 °C
Connecting - motor
- auxiliary switch
cable 1 m, 2 x 0,75 mm
cable 1 m, 6 x 0,75 mm
(BLF 24-T-ST) with plug-in connectors
Thermal trips
Tf1: duct outside temperature 72 °C
Tf2/Tf3: duct inside temperature 72 °C
2
2
Summary of Contents for FDMB
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