Siemens SQN72 Series - User Manual

CC1N7802en
8/11/2021
Smart Infrastructure
7
802
Actuators for air and gas
dampers
SQN72…
SQN73…
Electromotoric actuators for air dampers and control valves of oil and gas
burners of small to medium heat capacity.
The SQN72/SQN73 and this data sheet are intended for original equipment
manufacturers (OEMs) using the SQN72/SQN73 in or on their products.
Use
The SQN72/SQN73 actuators are designed for positioning and driving air/gas dampers
of oil burners, gas burners, and other ancillary equipment of small and medium heat
capacity. They also offer load-dependent control of the amount of fuel and combustion
air.
The controlling elements are controlled as follows depending on the current burner
load:
 In connection with P-PI or PID controllers, such as the RWF5
 Directly via the different types of burner controls, such as LOA, LMO, LME, or LFL
 In connection with 1- or 2-wire control or 3-position controllers
Features
 Impact-proof and heat-resistant plastic housings
 Plug terminals for the electrical connections
 Maintenance-free gear train, which can be disengaged
 Internal position indication
 Easy-to-adjust end and auxiliary switches for adjusting the switching points
 Internal electronic circuits
 Protection type IP54
 Holding torque 0.7–1.3 Nm
 Running time 4–30 s
 Direction of rotation: SQN72 counterclockwise and SQN73 clockwise

Siemens SQN72 Series Specifications

General

Brand	Siemens
Model	SQN72 Series
Category	Controller
Language	English

Summary

Actuators for Air and Gas Dampers

Application Overview

Describes the use of SQN72/SQN73 actuators in HVAC systems for air and gas dampers.

Key Features

Lists principal characteristics of the actuators including housing, terminals, and internal components.

Safety Warnings and Handling Precautions

General Safety Instructions

Covers prevention of personal injury, property damage, and environmental harm.

Electrical Safety and Static Discharge

Notes on preventing electric shock, ensuring touch protection, and avoiding ESD.

Actuator Version Selection Guidance

Advice on selecting the correct actuator version based on torque and mechanical design.

Mounting and Installation Guidelines

General Mounting Requirements

Compliance with regulations, avoiding solar radiation, and secure connections.

IP54 Protection Maintenance

Ensuring IP54 rating is maintained through proper installation of drive shaft bearing.

Shaft Connection and Load Management

Recommendations for shaft connections and managing bearing loads.

Electrical Wiring Practices

Compliance with wiring regulations, strain relief, and terminal protection.

Standards, Lifecycle, and Disposal

Compliance and Certifications

Details on applied directives (Low Voltage, EMC) and relevant standards.

Designed Product Lifetime

Information on expected service life based on start cycles and replacement criteria.

Service and Disposal Procedures

Guidance on unit replacement, function assignment, and proper waste management.

Product Design and Construction

Housing and Internal Structure

Materials, synchronous motor, reduction gear, camshaft, and switch sections.

Motor and Coupling Mechanism

Description of the synchronous motor and its disengageable coupling.

Switching and Positioning Elements

Cam disks for adjustment, scales, and internal position display.

Gear Train and Drive Shaft

Details on the maintenance-free gear and the drive shaft mounting.

Potentiometer Installation Options

Actuator suitability for potentiometer integration and separate ordering.

Technical Data: Actuator Specifications

Core Actuator Parameters

Mains voltage, frequency, motor, consumption, angle, position, and protection class.

Protection, Cable Entry, and Wiring

IP54 details, fuse, cable entry, strain relief, and connection terminals.

Electrical Connections and Timing

Ferrules, direction of rotation, torque, and running times.

Technical Data: Switches and Load Capacity

End and Auxiliary Switch Configurations

Number of switches, actuation method via camshaft, and fine adjustment.

Maximum Current Load Ratings

Permissible current load per circuit and inductive load notes.

Technical Data: Environmental and Functional Aspects

Operating Environmental Conditions

Temperature and humidity ranges for storage, transport, and operation.

Mechanical Stress Testing

Vibration and shock test standards applied to the actuator.

Actuator Functionality Overview

Motor-driven camshaft actuating switches, with optional electronic modules.

Circuit Diagrams and Control Sequences (LME22)

Diagram Conventions and Notes

Explains diagram start position, end switch state, and general notes.

LME22 2-Stage;Modulating Operation

Circuit diagram and program sequence for LME22 in 2-stage or modulating mode.

Circuit Diagrams and Control Sequences (LOA;LMO)

LOA;LMO 2-Stage Operation (Low-Fire)

Circuit diagram and program sequence for LOA/LMO controllers.

Circuit Diagrams and Control Sequences (LMO39)

LMO39 2-Stage Operation (Low-Fire)

Circuit diagram and program sequence for LMO39 in 2-stage mode.

Circuit Diagrams and Control Sequences (LFL;LGK16;LAL;LOK16)

LFL;LGK16;LAL;LOK16 2-Stage;Modulating Operation

Circuit diagram and program sequence for LFL/LGK16/LAL/LOK16.

Circuit Diagrams and Control Sequences (LME22 - Type D)

LME22 Type D 2-Stage Operation

Circuit diagram and program sequence for LME22, type D.

Circuit Diagrams and Control Sequences (LAL;LFL;LGK16;LOK16 - Type E)

LAL;LFL;LGK16;LOK16 Type E Modulating Operation

Circuit diagram and program sequence for LAL/LFL/LGK16/LOK16, type E.

Physical Dimensions and Shaft Details

External Dimensions Overview

Measured dimensions of the actuator housing in millimeters.

Shaft Design and Identification

Visuals and specifications for shaft side view, cross-section, and numbering.