ABB SCK - Overview of Dangers

OI/SCK
-EN Rev. E Operating instruction SCK Gas Sampling System 57
Overview of dangers
The gas sampling system is designed such that the operator is protected
against all dangers that can be reasonably avoided by means of design.
Due to the purpose of the gas sampling system, however, there are neverthe-
less residual risks that require precautions to be avoided.
The following section gives information about the nature of these residual
risks and their effect.
The gas sampling probe moves in and out automatically. Expect a system-
actuated movement of the gas sampling probe at any time. The gas sampling
probe not only performs individual extension and retraction movements but
also performs combined processes involving successive extension and retrac-
tion movements. This means:
 risk of injury due to automatic extension and retraction movements of the
gas sampling probe if anyone is standing in the retractor's area of travel.
 danger of toxic, harmful gases when the shutter is open.
The gas sampling system contains current-carrying components. This means:
 The main terminals -X30, -X40 and the input terminals of the main switch-
es -Q30, -Q40 are live even when the main switches are off.
 All metallic parts in the environment that can be touched at the same time
as the machine must also be grounded together.
 Check pre-protection according to the documentation.
 Danger of electrocution,
 If covers on control cabinet, terminal box or power connection are open.
Connectors in the control cabinet or terminal box may also carry cur-
rent.
 If the connection between the protective earth connector and a protec-
tive earth conductor is not made before all other connections.
 If the protective earth conductor is interrupted inside or outside the
gas sampling system or the protective earth connector is disconnected.
 If the set operating voltage and mains voltage do not match before
switching on.
 If work is performed on the open gas sampling system without discon-
necting the gas sampling system from the power supply.
 Due to charged capacitors in the gas sampling system even if the gas
sampling system has been disconnected from all sources of power.
 Due to fuses that do not match the specified type and nominal current
and repaired fuses.
During operation of the gas sampling system surfaces and parts get hot. This
means:
 Danger of burning due to hot surfaces during and after operation of the
system.
Meaning
Moving gas sampling
probe
Current-carrying
components
Hot surfaces