Siemens SQN73 Series Руководство - Страница 3
Просмотреть онлайн или скачать pdf Руководство для Контроллер Siemens SQN73 Series. Siemens SQN73 Series 20 страниц. Actuators for air and gas dampers
Печатать страницуWarning notes
Selection of actuator version
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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
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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CC1N7802en
8/11/2021