Landis/Siemens Damper Servo Motors

SQN3 Motors
Electromotoric actuators for use with air dampers and control valves of oil or gas burners of small to medium capacity.

Features:
The SQN3 actuators are designed for driving gas or air dampers of oil or gas burners of small to medium capacity, or for load-dependent control of the fuel or combustion air volume In connection with P-PI or PID controllers, such as the RWF40 Directly via the different types of burner controls, such as LOA..., LMO..., LMG... or LFL
• In connection with 1- or 2-wire control or 3-position controllers
All types of Actuators with:
• Impact-proof and heat-resistant plastic housing
• Screw terminals for the electrical connections
• Maintenance-free gear train, which can be disengaged
• Internal and external position indication
• Easy-to-adjust end and auxiliary switches for setting the switching points

SQM10 Motors
The reversible damper motors type SQM are suitable for 2-wire control with controllers or switching units with changeover contact.

The control section comprises 2 motor travel limit switches, 5 auxiliary switches and - on request - 1 potentiometer (as feedback potentiometer for P-control, as position indicator with slave control systems, or for remote position indication).

The operation of the limit and auxiliary switches is made by manually adjustable cams. Setting scales provided between the cam discs simplify the adjustment. An additional scale at the end of the cam stack serves as position indicator. In addi- tion, the damper motor type SQM21 is provided with a position indicator visible from the outside.

The reduction gearing is provided with self-lubricating sinter- bronze bearings and therefore requires no periodic mainten- ance. When mounting the motor and damper actuating rod, the gearing can be decoupled by means of a lever, so that the main drive spindle is easy to adjust in either direction of rota tion.

The gear housing is of die-cast aluminium and painted silver- grey; the cover is in dark-grey, impact proof plastic. The base is provided with four threaded entries for Pgll cable glands.