Siemens SQN72 Series User manual

CC1N7802en
8/11/2021
Smart Infrastructure
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
h
e
e
t
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
IP
54
Form-fitted design

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Standards and certificates
Applied directiv
es
:

L
ow
Voltage Directive
2014/35/EC

Electromagnetic compatibility
EM
C
(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
to
r motor
Coupling
Switching point
adjustment
Po
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
4)
(max.) Nm
Holding torque
Nm
Auxiliary switch
5)
Piece
R
elay
Piece
Po
tentiometer 7)
Housing length ¹)
mm
Types for mains voltage / mains frequency
230 V AC 3)+10%/-15%
50
–
60 Hz
Article no.
Type
A
0
4
1.5
0.7
2
2
x
117
BPZ:SQN72.2A4A20
SQN72.2A4A20
A
0
12
2.5
1.2
2
2
x
117
BPZ:SQN72.4A
4A
20
SQN72.4
A4A
20
B
1
4
1.5
0.7
2
3
---
117
S55454
-
D303
-
A100
SQN72.2B4A21
C
0
4
1.5
0.7
2
---
x
11
7
BPZ:SQN72.2C
4A20
8
)
SQN72.2C4A20
8
)
C
0
12
2.5
0.7
2
---
x
117
S55454
-
D301
-
A100
SQN72.4C4A21
8
)
C
0
30
2.5
1.3
2
---
x
117
BPZ:SQN72.6C4A20
SQN72.6C4A20
C
1
30
2.5
1.
3
2
---
x
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
I
7) Directly suitable for potentiometer installation, refer to the
Po
te
ntiometer
ins
tallation
chapter
8) On request

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Type summary (further types on request)
SQN73 actuators / direction of rotation 6)right
Di
agram no.
Shaft ¹) no.
Running time
at 50 Hz 2)
for 90° (s)
Loading torque
4)
(max.) Nm
Holding torque
Nm
Auxili
ary switch 5)
P
iece
Relay
Piece
Potentiometer
7)
Housing length ¹)
mm
Types for mains voltage / mains frequency
230 V AC 3)+10%/-15%
50
–
60 Hz
Article no.
Type
B
0
12
2.5
1.2
2
3
x
117
S55454
-
D345
-
A100
SQN73.4B4A20
Key
1) Refer to
D
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
s
eparately:

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Technical data
Mains voltage
230
V
AC
-
15%/+10%
Mains frequency
50 to 60 Hz ±6%
Actu
at
or motor
Syn
chro
nous motor
Internal consumption
Max.
6
VA
Positioning angle
, usable range
Max.
1
60°,
scale range 0
–
130°
Mounting position
Op
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
3
0
-
2
-
14:2019
External primary fuse (Si) 6.3 A
T (to be installed on site) according to
IEC 60127
-
2
-
5
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 (
t
he opening
facing
the shaft)

SQN72
Counterclockwi
se

SQN73
Clockwise
Torque and holding torque
Refer to
Type summary
Running times
Refer to
Ty
pe s
ummary
Pause times at change in direction of
rotation
>100 ms
Actuator

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Technical data (continued)
Lifetime 250,000 start cycles (OFF ON OFF)
under load with the rated torque in the
entire rotation angle range.
Weight (on average)
Approx. 500 g
Permissible on time 60%, maximum 3 minutes without
interruption
Gear backlash between the actuator motor
and actuator shaft

Ex work
s
1.2° 0.3

After
250,000 cycle
s
1.5° 0.3°
Switching voltage
24
–
250
V
AC
Number of e
nd s
witches
2
Number of a
uxili
ary switches
Refer to
Type summary
Actuation Via camshaft, color-coded cam disks, refer
to
Connec
t
ion
diagrams
.
Engagement of the cam disks with fine
adjustment
Infinitely variable
Maximum permissible current load at cos = 0.9:
(Values in bracket
s:
short
-
t
erm
peak
load
for max. 0.5 s)
Circuit A
– Terminals 1, 2, 3, 8
– Terminals 4, 5
–
Terminals 6, 7
Max. 0.5 A
Max. 2 A (5 A)
Max.
1 A
(2 A)
Circuit B
– Terminals 1, 2, 3, 8
– Terminals 4, 5
–
Terminals 6, 7
Max. 0.5 A
Max. 2 A (5 A)
Max.
1 A (
2 A)
Circuit C
– Terminals 1, 2, 3, 4, 5
–
Terminals 6, 7, 8
Max. 0.5 A
Max.
1 A
(2 A)
Circuit D
– Terminals 1, 2, 3, 8
– Terminals 4, 5
–
Terminals
6, 7, 9, 10, 11
Max. 0.5 A
Max. 2 A (5 A)
Max. 1 A (2 A)
Circuit E
– Terminals 1, 2, 3, 4, 5
–
Termina
ls 6,
7
*)
, 8, 9, 10, 11
Max. 0.5 A
Max. 0.5
*) In case of modulating operation, fuel valve ‘BV2’ is replaced by a gas control valve ‘RV’
Please note!
When connecting a fuel valve: Max. 0.3 A, cosφ>0.8 inductive.
Safety
-
rel
evant
applications are only available with Siemens burner controls!
End switches and
auxiliary switches

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Technical data (continued)
Please note!
Condensation, formation of ice, and ingress of water are not permitted.
Failure to observe these poses a risk of damaging the safety functions and a
risk of electric shock.
Storage
Temperature range
-
20 to +60°C
Humidity
< 95% r.h.
Transport
Temperature range
-
50 to +60°C
Humidit
y
<
95% r.h.
Operation
Temperature range
-
20 to +60°C
Humidity
< 95% r.h.
Installation altitude
Max. 2,000 m above sea level
Vibration tests According to IEC 60068-2-6:2008 with
acceleration of 10 m/s²
Shock tests According to IEC 60068-2-27:2010 with
peak accelerations of 100 m/s²
Function
A synchronous motor drives the drive shaft with a mounted camshaft via a gear. The
camshaft actuates end switches and auxiliary switches. The switch position of each end
switch and auxiliary switch can be adjusted by an assigned cams disk within the
running range. Some actuator versions are equipped with electronic switching modules
that perform additional functions in connection with the end switches and auxiliary
switches and external units, such as controllers (refer to Circuit diagrams).
Environmental
conditions
Climatic conditions
Mechanical conditions

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Circuit diagrams (examples)
Please note!
All of the following circuit diagrams show the start position as supplied:
End switch position II CLOSED

No
voltage
No. A LME22
2-stage or modulating operation prepurging at high-fire position (NL)
X1
Plug
-
in space, 4
-
pole
X2
Plug
-
in space, 5
-
pole
I
II
III
IV
red
blue
orange
black
Program sequence diagram shows
2-stage operation.

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Circuit diagrams (examples)
No. B LOA24 / LOA25 / LOA26 / LOA28 / LOA36 / LMO24 / LMO44
2-stage operation prepurging at low-fire position (KL)
1)
Without oil preheater
2) With oil preheater:
If the oil preheater contact
(OW) opens during operation, a
restart follows
*) Thermostat or similar unit with
NO contact (1
-
wire control)
X1
Plug
-
in space, 4
-
pole
X2
Plug
-
in space, 5
-
pole
I
II
III
IV
red
blue
orange
black
4) One-sided approach to the
target position to eliminate the
switching differential (backlash
compensation).

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Circuit diagrams (examples)
No. B LMO39
2-stage operation prepurging at low-fire position (KL)
1) Without oil preheater
2)
With oil preheater
*) Thermostat or similar unit with
NO contact (1
-
wire control)
X1
Plug
-
in space, 4
-
pole
X2
Plug
-
in space, 5
-
pole
Cam switches
I
red
II
blue
III
orange
IV black
4) One-sided approach to the target
position to eliminate the switching
differential (backlash
compensation)

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Circuit diagrams (examples)
No. C LFL / LGK16 / LAL / LOK16
2-stage or modulating operation prepurging at high-fire position (NL)
X1
Plug
-
in space, 4
-
pole
X2
Plug
-
in space, 5
-
pole
I
II
III
IV
red
blue
orange
black
Program sequence diagram
shows modulating operation.

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Circuit diagrams (examples)
No. D LME22
2-stage or modulating operation prepurging at high-fire position (NL)
X1
Plug
-
in space, 4
-
pole
X2
Plug
-
in space, 5
-
pole
X3
Plug
-
in space, 3
-
pole
I
II
III
IV
V
red
blue
orange
black
green
Program sequence diagram
shows 2-stage operation.

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Circuit diagrams (examples)
No. E LAL / LFL / LGK16 / LOK16
2-stage or modulating operation prepurging at high-fire position (NL)
*) Thermostat or similar unit with
changeover contact or 3-position
controller for OPEN/CLOSED
positioning pulses and neutral
position
**) In case of modulating operation,
fuel valve ‘BV2’ is replaced by a
gas control valve ‘
R
V’
X1
Plug
-
in space, 4
-
p
ole
X2
Plug
-
in space, 5
-
pole
X3
Plug
-
in space, 3
-
pole
F
Internal fuse
Cam disks:
I
II
III
IV
V
red
blue
orange
black
green
Program sequence diagram
shows modulating operation.

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Key
ADesignation for internal circuit.
Appears in the second
position after the period in the type reference
I/II
End switch
es
III/IV/V
Auxiliary switch
es
AL
Remote lockout display (alarm)
BV1
Fuel valve stage 1
BV2
Fuel valve stage 2
BV3
Fuel valve s
tage 3
EK2
Exter
n
al remote
lockout reset button
ION
Ionization
probe
F
Internal fuse, not replaceable
FS
Flame signal
GP
Gas pressure switch
HS
Main switch
KL
Low
-
fire
L
Phase
LK
Air damper
LKP
Air damper position
LP
Air pressure switch
L
R
Load
controller
M
Bu
r
ner motor
or fan motor
MActuator synchronous motor
M1
Without postpurging
M2
With postpurging
N
Neutral conductor
NL
High
-
fire
OH
Oil preheater
OW
Oil preheater release contact
QRB
Photoresistive dete
ctor
R
Control t
h
ermostat
o
r pressurestat
Relay
R
V
Control valve
SA
Actuator
Si
External primary fuse, as specified in the data sheet of the relevant burner control
S
B
Safety limiter
STx
Stage
tx / Tx
Program times (r
efer to the data
s
heet of t
h
e relevant burner control)
TSA
Safe
ty time
RResistor
Z
Ignition transformer
CLOSED
Damper closed

Direction of rotation OPEN

Direction of rotation CLOSED
Program sequence
–
Diagrams
A
Burner ON
A
–
B
Bu
r
ner star
t
u
p
B
–
C
Burner operation / load con
trol operation, modulating or 2
-
stage
C
Burner OFF
C
–
D
Postpurge time
D
End of program sequence, burner control ready for restart
Control signals delivere
d by burner control
Required inp
ut signals
Permissible input signals

20/20
Smart Infrastructure CC1N7802en
8/11/2021
Dimensions
Dimensions in mm
All shafts are shown in end switch position II CLOSED (as supplied).
M
Through
-
hole Ø 5.3 mm
T
Knockout open
i
ng Ø 5.3 mm
2021 Siemens AG Smart Infrastructure, Berliner Ring 23, 76437 Rastatt, Germany
Subject to change!