TEL AFA4000/E - Fail Safe Damper Operation

AFA4000/E VAV Airflow Controller / p.175
9.4 Fail safe damper operation
The Econ power supply is fitted with a super-cap quick-charge fail-safe feature that opens the
fume cupboard damper actuator in the event of mains power loss (Econ output 1 only). This
feature allows non fail-safe actuators to be fitted to the fume cupboard damper.
Specification
Ratings and requirement for fail-safe feature
Actuator voltage
22-28 Vdc
Actuator torque
Max 4 Nm
Actuator power consumption whilst
driving
Max 13W
Butterfly damper max pressure drop
across damper
1000 Pa
Multivane damper max pressure drop
across damper
500 Pa
Fail-safe operation
Fail-safe charge time
Max 30 seconds from fully discharged state
Fail-safe operation time
Max 5 seconds @ 0.25 W 24 Vdc for 4 Nm actuator
Charging indication
LED 2 (Green) Dim
Fail-safe active
LED 2 (Green) Bright
Note: Recommended damper actuator = Belimo LMQ24A-SR-TEL