Siemens SQN72 Series User manual

CC1N7802en

8/11/2021

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7802

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

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Supplementary documentation

Product type

Documentation type

Documentation number

LAL

Data sheet

N7153

LFL

Data sheet

N7451

LFL1.148

Data sheet

N7454

LGK16

Data sheet

N7785

LME2

Data sheet

N7101

LME7

Data s

N7105

LMO2

LMO4

LMO39

Data sheet N7130

LOA2

LOA3

Data sheet N7118

LOK16

Data sheet

N7785

RWF50

Data sheet

N7866

User manual

U7866

RWF55

Data sheet

N7867

User manual

U7867

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Warning notes

To avoid personal injury or damage to property or the environment, the following

warning notes must be observed.

Read the documentation on the actuators carefully and fully.

If not observed, dangerous situations might occur

The user must ensure that the actuators meet the requirements of the relevant

application standards

Safety-related applications are only possible with Siemens burner controls

All product-related activities (mounting, settings and maintenance) must be

performed by appropriately qualified and authorized personnel

Before carrying out any work in the connection area of the plant, disconnect all

poles from the power supply. Ensure that the plant cannot be inadvertently

switched on again and that it is indeed dead. If the plant is not switched off, there is

a risk of electric shock

Take suitable measures to provide touch protection at the electrical connections

and ensure the housing cover is screwed down tight

Each time work has been carried out (mounting, installation, service work, etc.),

check to ensure that wiring is in an orderly state

These devices must not be put back into operation following impact or shock; even

if they do not exhibit any visible damage, their safety functions may be impaired

Please note!

Risk of electric shock – to disconnect the unit from the power, it may be necessary

to open more than one switch. Before performing maintenance work, the unit must

be disconnected from power

All cam switch settings must satisfy the requirements of the relevant application

standards

To ensure protection against electric shock, the connection terminals must have

adequate touch protection. Make certain that non-insulated connections or wires

cannot be touched. The housing cover must be screwed tight

Static charges must be avoided since they can damage the electronic components

of the unit on contact.

Recommendation:

Use ESD equipment

Selection of actuator version

Ensure that any torque from outside acting on the controlling element (e.g., torque

from the airflow produced by the burner fan) will be smaller than the zero-current

state self-holding torque of the actuator

The mechanical design of the burner must be such that any inadmissibly high

torque from outside acting on the controlling element will not lead to critical burner

operation.

Example:

If a torque acts on the asymmetrical bearing of the air damper due to the airflow in

the air duct of the burner, the air damper is moved in the OPEN direction. This

leads to a certain amount of excess air during combustion, which is less critical

than a lack of air.

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Mounting notes

Ensure that the relevant national safety regulations and notes on standards are

complied with

In the geographical areas where DIN regulations are in use for mounting and

installation, the requirements of VDE must be complied with, especially

DIN/VDE 0100, 0550 and DIN/VDE 0722

Make certain that the actuator is not exposed to direct solar radiation

The connection between the actuator drive shaft and controlling element must be

form-fitted and backlash-free

Additional axial and radial bearing loads are not permitted while mounting

Be sure to observe the correct mounting sequence when mounting the actuator to

the controlling element.

This is usually as follows:

1. Fit and secure the actuator

2. Connect the actuator drive shaft to the controlling element via a coupling pin.

To ensure protection class IP54 throughout the lifetime of the actuator, the bearing of

the actuator drive shaft must be located somewhere it will not be directly exposed to

water or dust.

Please note!

Possible shaft/hub connections:

Flattened shaft with corresponding counterpart

To avoid inadmissible bearing loads caused by rigid hubs, it is recommended to use

compensating couplings with no mechanical play (e.g., metal bellows couplings).

When dimensioning a shaft connection, note that torques higher than the rated

output torque of the actuator can also act during operation:

- The actuator itself can generate a higher torque under optimum operating

conditions

- The effect of mass moments of inertia (caused by the rotating parts in the motor

as well as on the actuator) can lead to sudden impulse loads

Siemens recommends overdimensioning the shaft connection by a factor of 2

compared to the rated torque of the actuator

The connection between the actuator and burner or controlling element must be

very rigid (no bending). This is particularly important when using column-mounted

structures

Installation notes

Ensure that the electrical wiring is in compliance with national and local regulations

Make certain that strain relief of the connected cables is in compliance with the relevant

standards (e.g., as per EN 60730 and EN 60335 series of standards)

Ensure that spliced wires cannot come into contact with neighboring connections. Fit

suitable ferrules

SQN72/SQN73 terminals that are not used must be protected by dummy plugs

When wiring the unit, the 230 V AC range must be strictly separated from the other

voltage areas to ensure protection against electric shock

The connection between the actuator shaft and the relevant controlling element must

be form-fitted

Only plastic versions of cable glands may be used

Form-fitted design

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Standards and certificates

Applied directiv



Voltage Directive

2014/35/EC



Electromagnetic compatibility

(immunity)

2014/30/EC

Compliance with the regulations of the applied directives is verified by the adherence to

the following standards/regulations:

Automatic electrical controls for household and similar use

Part 1: General requirements

DIN EN 60730-1

Automatic electrical controls for household and similar

use

Par

t 2

14: Particular requirements for electric actuators

DIN EN IEC 60730-2-14

The edition of the standards that applies in each case can be found in the

declaration of conformity.

EAC conformity (Eurasian conformity)

ISO 9001:2015

ISO 14001:2015

OHSAS 18001:2007

China RoHS

Hazardous substances table:

http://www.siemens.com/download?A6V10883536

Lifetime

The actuator has a designed lifetime* of 250,000 start cycles (OFF ON OFF) under

load with the rated torque in the entire rotation angle range, which under normal

operating conditions in heating mode corresponds to approx. 10 years of service life

(starting from the production date given on the type label). This lifetime is based on the

endurance tests in the standard EN 298. A summary of the conditions has been

published by the European Control Manufacturers Association (Afecor) (www.afecor.org).

The designed lifetime is based on use of the actuator according to the manufacturer’s

data sheet. After reaching the designed lifetime in terms of the number of burner startup

cycles, or after the corresponding usage time, the actuator must be replaced by

authorized personnel.

* The designed lifetime is not the warranty time specified in the Terms of Delivery.

Service notes

When replacing an actuator, the following points must be checked and corrected if

necessary:

Correct connection to the basic unit

Assignment of functions

Disposal notes

The unit contains electrical and electronic components and must not be disposed of

together with domestic waste. Local and currently valid legislation must be complied

with.

Unit

replacement

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Design

The lower housing is made of dark gray, impact-proof and heat-resistant plastic

The housing cover is made of light gray, impact-proof and heat-resistant plastic

The housing encloses:

– the synchronous motor with the disengageable reduction gear

– the camshaft of the control section

– the relays – depending on the type

– the switch section – connected to the plug-in spaces of the connection terminals via an

assembled PCB

Synchronous motor

Shaft can be disengaged from the gear and motor by manually actuating the

coupling (pressure pin (K))

Automatic reset

Via rotating cam disks

Scales adjacent to the cams indicate the angle of the switching point

Cam disks with fine adjustment, adjustable with standard screwdriver

Assignment of the cam disks to the color-coded end switches and auxiliary

switches, refer to Circuit diagrams

Internal: Scale at the beginning of the camshaft on the gear side.

Refer to Technical data.

Maintenance free.

Burnished steel

Fixed on one side on the front of the gear

Available as an actuator variant in different versions

Front of gear as bearing surface

Fastening with through holes

Versions for potentiometer installation

Some actuators are directly suitable for potentiometer installation ex works. They are

manufactured to accommodate the potentiometer and do not require any other further

parts. The chosen potentiometer must be ordered separately , refer to Accessories.

Detailed mounting instructions M7921 (4 319 9604 0) are included in the scope of

delivery of the ASZ.

Housing

Actua

r motor

Coupling

Switching point

adjustment

sit

ion display

Connection technology

Gear

Drive shaft

Mounting and fixing

Potentiometer

installation

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Type summary (further types on request)

SQN72 actuators / direction of rotation 6)left

Diagram no.

Shaft ¹)

no.

Running time

at 50 Hz 2)

for 90° (s)

Loading torque

(max.) Nm

Holding torque

Auxiliary switch

Piece

elay

Piece

tentiometer 7)

Housing length ¹)

Types for mains voltage / mains frequency

230 V AC 3)+10%/-15%

–

60 Hz

Article no.

Type

1.5

0.7

117

BPZ:SQN72.2A4A20

SQN72.2A4A20

2.5

1.2

117

BPZ:SQN72.4A

SQN72.4

A4A

1.5

0.7

---

117

S55454

D303

A100

SQN72.2B4A21

1.5

0.7

---

BPZ:SQN72.2C

4A20

)

SQN72.2C4A20

)

2.5

0.7

---

117

S55454

D301

A100

SQN72.4C4A21

)

2.5

1.3

---

117

BPZ:SQN72.6C4A20

SQN72.6C4A20

2.5

---

117

BPZ:SQN72.6C4A21

SQN72.6C4A21

Key

1) Refer to

Dimensions

2) Specifications apply to 50 Hz; at 60 Hz, the running times are about 17% shorter.

3) Approx. 20% torque reduction with undervoltage

4) Under rated conditions, under extreme conditions (e.g., +60°C, 230 V AC -15%) approx. -25%

5) Free auxiliary switches (along with 2 end switches)

6) When looking at the shaft and control voltage at end switch

7) Directly suitable for potentiometer installation, refer to the

ntiometer

ins

tallation

chapter

8) On request

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Type summary (further types on request)

SQN73 actuators / direction of rotation 6)right

agram no.

Shaft ¹) no.

Running time

at 50 Hz 2)

for 90° (s)

Loading torque

(max.) Nm

Holding torque

Auxili

ary switch 5)

iece

Relay

Piece

Potentiometer

Housing length ¹)

Types for mains voltage / mains frequency

230 V AC 3)+10%/-15%

–

60 Hz

Article no.

Type

2.5

1.2

117

S55454

D345

A100

SQN73.4B4A20

Key

1) Refer to

imensions

2) Specifications apply to 50 Hz; at 60 Hz, the running times are about 17% shorter.

3) Approx. 20% torque reduction with undervoltage

4) Under rated conditions, under extreme conditions (e.g., +60°C, 230 V AC -15%) approx. -25%

5) Free auxiliary switches (along with 2 end switches)

6) When looking at the shaft and control voltage at end switch I

7) Directly suitable for potentiometer installation, refer to the

Potentiometer installation

chapter

8) On request

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Accessories

Proportional controlling element with mounting plate VKP

Proportional controlling element for mounting between

threaded flanges in gas trains.

Refer to Data Sheet N7646.

ASZxx.3x potentiometer

Refer to Data Sheet N7921.

Refer to Mounting Instruction 4 319 9604 0 (M7921).

Example:

RWF50 compact universal controller

For load-dependent control of the amount of fuel and

combustion air in connection with P-PI or PID controllers.

Refer to Data Sheet N7866.

RWF55 compact universal controller

For load-dependent control of the amount of fuel and

combustion air in connection with P-PI or PID controllers.

Refer to Data Sheet N7867.

To be ordered

eparately:

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Technical data

Mains voltage

230

15%/+10%

Mains frequency

50 to 60 Hz ±6%

Actu

or motor

Syn

chro

nous motor

Internal consumption

Max.

Positioning angle

, usable range

Max.

60°,

scale range 0

–

130°

Mounting position

tional

Degree of protection IP54 in accordance with EN 60529:1991 +

A1:2000 + A2:2013 when using the cable

entry provided plus plastic washers for the

Mfixing screws as shown in the

Dimensions chapter.

Please note!

The drive shaft bearing must be installed appropriately to protect

against direct exposure to water and dust, otherwise IP54 cannot be

gua

ranteed for the e

ntire

lifetime.

Protection class II according to EN 60730-1:2016 +

A1:2019 and EN IEC 607

14:2019

External primary fuse (Si) 6.3 A

T (to be installed on site) according to

IEC 60127

Cable entry Rubber grommet for the insertion of a

single sheathed cable with a maximum

diameter of 11 mm. The opening of the

rubber grommet must be suitably adapted

to the sheath diameter of the cable. To

ensure that the rubber grommet will be

tight, the cable must be correctly laid in

this area with no openings. The rubber

grommet is included in the scope of

delivery.

Cable strain relief Cable strain relief bridge with 2 fixing

screws included in sco

pe of delivery

Cable connection 2 plug-in spaces with connection terminals

Type CUM / manufactured by Stelvio

For the following connector types:

CUF 5-4 (plug-in space X1)

CUF 5-5 (plug-in space X2)

Recommended cross-sectional area of

stranded wire

Min. 0.5 mm² and max. 1.5 mm²

The connectors are not included in the

scope of delivery (order directly from

Stelvio).

Ferrules Matching the cross-sectional area of the

stranded wire

Direction of rotation (

he opening

facing

the shaft)



SQN72

Counterclockwi



SQN73

Clockwise

Torque and holding torque

Refer to

Type summary

Running times

Refer to

pe s

ummary

Pause times at change in direction of

rotation

>100 ms

Actuator

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