Siemens Damper Actuators and Air-Side Control
Demand-based ventilation starts with damper control. The right torque and the right fail-safe behaviour are matters of both efficiency and safety.
Damper actuator selection defines the torque (Nm) required by damper area and type, rotation angle, running time, control signal and the position taken on power failure (spring return or non-spring return). Safety-critical applications use spring-return actuators.
Torque calculation and fail-safe position
Damper torque is calculated from blade area and damper type using a per-square-metre figure; for low-leakage dampers that figure rises significantly. Insufficient torque means the damper never fully closes, causing continuous outside air leakage.
Product groups
- Rotary damper actuators
- Spring-return fail-safe actuators
- Modulating (DC 0–10 V) actuators
- On-off and 3-point actuators
- Fresh air and mixing damper applications
Frequently asked
Is a spring-return actuator always necessary?
No. It is required where the damper must reach a defined position on power failure (frost protection, exhaust, safety). For comfort-oriented mixing dampers it is usually unnecessary.
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