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Servomotor Type SQN 7...
dreizler A 3001 E - 18.12.2015 | A 2025 - 2.14 | EN - 11.11.2014 51
16 Servomotor Type SQN 7...
Electromotoric actuator for air dampers and regulating valves in gas and oil burners
The actuators are designed for load-independent regulation of fuel and combustion air flow, e.g. in connec-
tion with PID controllers, or directly via various automatic firing sequence controls.
NOTICE:
For more information please see Siemens datasheet 7804 in the appendix.
16.1 Function
A synchronous motor drives a drive shaft with fitted cam roller by way of a gear box. The cam roller actuates
limit and auxiliary switches. The switching position of each limit or auxiliary switch can be configured by
way of an associated cam disk within its movement range.

The shaft can be disconnected from gear box and motor by way of manual activiation of a coupling with
locking bolt (2) and (5).
16.2 Preadjustment of the servomotor SQN 7...
NOTICE:
Before commissioning or replacement of the servomotor the rotating direction must be noticed. Depending
on mounting position, actuators with anti-clockwise or clockwise rotational direction are used.

Actuator SQN 70... anti-clockwise rotational direction

Actuator SQN 71... clockwise rotational direction

The ease-of-movement of the air damper and the linkage must be checked.
Fig. 16-1 Potentiometer SQN 7..., top view
1 Control panel
2 Locking bolt
3 Motor housing
Fig. 16-2 Potentiometer SQN 7..., side view
1 Wrench-adjustable cam rings
2 Basement
3 Motor housing
4 Axis
5 Locking bolt