Servomotors (Sqn13 - Riello RS 25/E BLU Installation, Use And Maintenance Instructions

4.14 Servomotors (SQN13...)

Introduction
The servomotors that equip the burners of the RS range work di-
rectly on the air damper and the gas butterfly valve, without me-
chanical leverages but via the interposition of an elastic coupling.
They are commanded by the control box, which constantly
checks their position by means of a return signal from the optic
sensor inside the servomotor.
Important notes
To avoid accidents, material or environmental
damage, observe the following instructions!
Avoid opening, modifying or forcing the servo-
WARNING
motor. The servomotor is equipped with a system
of optical feedback.
 All interventions (assembly and installation operations,
assistance, etc.) must be carried out by qualified personnel.
 Before modifying the wiring in the servomotor connection
area, fully disconnect the burner control device from the
power supply (omnipolar separation)..
 To avoid the risk of electrocution, protect the connection ter-
minals in a suitable manner and correctly fix the cover.
 In the event of assembly, installation, maintenance, etc... it is
necessary to check that the wiring and the parameterisation
are in order.
 Falls and collisions can negatively affect the safety func-
tions. In this case, the unit must not be operated, even if it
displays no evident damage.
Installation notes
 Check the relevant national safety standards are respected.
 The connection between the actuator command shaft and
the control element must be rigid, without any mechanical
play.
 The tightening torque for the fixing screws should be 1.5
Nm. It is recommended that this value is not exceeded to
prevent damaging the servomotor.
 To avoid an excessive load on the bearings due to rigid
hubs, the use of compensation clutches without any
mechanical play is recommended (e.g. metal bellows-type
clutches).
 It is advisable to oversize the drive shaft in relation to the
rated torque of the actuator.
 The static torque is reduced when the electrical supply of the
actuator is switched off.
 Arrange the H.V. ignition cables separately, as far as possi-
ble from the control box and the other cables.
Technical description of the burner
19 GB
D8083
Technical data
Power supply
Safety class
Power absorption
Angle adjustment, usable
range
Degree of protection
Work of field
Opening time 0-90°
Direction of rotation
Torque operating
Torque off
Cable length
Radial load on the bearing
Axial load on the bearings
Weight
Connecting cable
Environmental conditions:
Operation
Climatic conditions
Mechanical conditions
Temperature range
Humidity
Condensation, formation of ice and the entrance
of water are not permitted!
WARNING
AC / DC 24 V ± 20% (load inter-
face)
EN 60730 part 1-14
Max. 7.5 W
Max. 90°
IP40
0-90°
5 sec.
Anticlockwise
0.7 Nm
0.4 Nm
1.2 m
30 N
Max. 5 N
About 0.3 kg
RAST2.5
DIN EN 60721-3-3
Class 3K3
Class 3M3
-10 ... +60 °C
< 95% RH
Fig. 10
Tab. I
20068118