Page 34 - trends in automation 1.2013

At the same time, the modular electrical
terminal CPX controls all of the electric
actuators and sensors of the system via
ProfiNet bus nodes. The pneumatic inter-
face VTSA provides the electromechanical
connection between the terminal CPX
and valve terminal VTSA. A complete
pneumatic control chain is connected to
the fieldbus using the input modules
of the CPX terminal.
Optimum parameter settings
Among the tasks performed by the
CPX-VTSA in the new RECLAIM system
from Keller Lufttechnik are control
of the pressure regulators for adjusting
the required pressures and flow rates
as well as vacuum exhausting of the
pinch valves. This optimises transport
parameters and extends service inter-
vals. In addition there is peak load
regulation to stabilise the compressed
air system, active consumption rate
monitoring, which monitors and reduces
compressed air consumption values,
as well as the actuation of exhaust-free
fluidisation valves without raw gas
return flow.
Energy savings of up to 50%
Thanks to the innovative technology of the
new RECLAIM system, up to 95 per cent
of the extracted raw gas can be returned
to the paint booth as pre-conditioned
clean gas. This saves significant amounts
of energy. The energy costs for paint
booths can be reduced by up to 50 per cent
in comparison with systems that use
exhaust air. 1,000 cubic metres of air
per hour, which must be supplied from
the outside and heated, require around
60 megawatts of energy every year.
Assuming a suction rate of 16,000 cubic
metres per hour, if just 5 per cent of
the air is supplied from the outside and
Ecological and economical: The new filter
systems regenerate up to 95 per cent of
the filtered air and are cleaned automatically
during operation.
The heart of the RECLAIM system: The PTFE-
coated membrane filter protects an auxiliary
filter layer made from limestone powder.