SIEMENS SQN30.121A3500 servo motor

Electromotoric actuators for air dampers or for fuel / air ratio control with oil or
gas burners of small to medium capacity.
? Versions for integrating a potentiometer
? Running times from 4.5 to 120 seconds
? All versions feature:
– Auxiliary switches and integrated relays (optional)
– Geartrains which can be disengaged
– Internal and external position indication
– Easily adjustable end and auxiliary switches

The actuators are used primarily for controlling the amount of combustion air:
– Load-dependent in connection with P-PI or PID controllers,
such as the RWF40…
– Directly with the help of the different types of burner controls,
such as the LOA…, LMO…, LMG… or LFL…

Mechanical design
– Made of impact-proof and heat-resistant plastic
– Accommodating:
– The reversible synchronous motor with the geartrain, which can be disengaged
– The camshaft of the control section
– The relays (depending on the type of actuator)
– The switches which, via a printed circuit board, are connected to the terminals
Scales beside the cams facilitate adjustment of the switching points.
An additional scale at the end of the camshaft serves for internal position indication.
A potentiometer, which can subsequently be integrated, delivers an electrical signal
which gives the position of the drive shaft (with the types of actuators prepared for fitting
a potentiometer).
A disk with a groove is attached to the head of the camshaft or to the potentiometer,
thus making visible the position of the actuator’s drive shaft from outside (refer to photos
on the front page).
The actuator has 2 openings for cable entry glands Pg9 and Pg11.
– Reversible and locking-proof synchronous motor
– Drive shaft can be manually disengaged from geartrain and motor
– Automatic reengagement
– By means of adjustable cams
– Scales beside the cams indicate the angle of the switching point
– Internally:
Scale at the beginning of the camshaft on the geartrain side

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