19
20068423
GB
Technical description of the burner
4.14
Servomotors (SQM33....)
Important notes
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.
Check the wiring is 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.
Assembly 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.
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).
Installation notes
Arrange the H.V. ignition cables separately, as far as possi-
ble from the control box and the other cables.
To avoid the risk of electrocution, make sure that the 230V
AC section of the servomotor is fully separated from the
functional low-voltage section.
The static torque is reduced when the electrical supply of the
actuator is switched off.
The housing cover may only be removed for short periods of
time for wiring or when making the addressing. In similar
cases, make sure that dust or dirt does not penetrate inside
the actuator.
The servomotor comprises a PCB with ESD-sensitive com-
ponents.
The top side of the board carries a cover which affords pro-
tection against direct contact. This protective cover must not
be removed! The underside side of the board must not be
touched.
Technical data
Tab. I
WARNING
To avoid accidents, material or environmental
damage, observe the following instructions!
Avoid opening, modifying or forcing the servo-
motor.
WARNING
During the maintenance or replacement of the
servomotors, be careful not to invert the con-
nectors.
Model
SQM33.4...
SQM33.5...
Operating voltage
AC / DC 24 V ± 20 %
Safety class
2 according to EN 60 730
Power consumption
Max. 7.5 W
Max. 10 W
Degree of protection
IP54 according to EN 60 529-1
Cable connection
RAST2, connectors
Rotation direction
- Anticlockwise (standard)
- Clockwise (inverted rotation)
Nominal torque (max)
1.2 Nm
3 Nm
Holding torque (max)
1.2 Nm
3 Nm
Running time (min.)
for 90°
5....120 s.
Weight
1.4 kg about
Environmental conditions:
Operation
Climatic conditions
Mechanical conditions
Temperature range
Humidity
DIN EN 60 721-3-3
Class 3K5
Class 3M4
-20...+60 °C
< 95% RH
WARNING
Condensation, formation of ice and the entrance
of water are not permitted!
D8271
Fig. 10
