Mounting Notes; Installation Notes - Siemens SQN72 Series Manual

Mounting notes

IP54
Form-fitted design

Installation notes

4/20
Smart Infrastructure

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

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
CC1N7802en
8/11/2021