Indramat TDA 1, Руководство по планированию проекта

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20 • DOK-DIAX01-TDA********-PRJ1-EN-E1,44 • 07.97
The controller TDA 1 can only perform at full drive ratings up to an
ambient temperature of 45
°
C . In order to keep within this environmental
limit, it may be necessary to install a system to cool the air inside the
control cabinet.
Improperly mounted cooling systems will expose installed controllers to
the risk of moisture condensation and the effects of condensation water!
Hot humid air penetrating the control cabinet will condense on the
controller while cooling!
If the cooler is wrongly located in the control cabinet, the condensation
water inherent to cooling systems may drip down onto the installed
controllers or be sprayed into them along with the flow of cooling air.
– When using cooling systems, select only well sealed control cabinets
which will prevent any moisture condensing out of hot humid air
penetrating from the outside.
– If the control cabinet has to be operated with its doors open (on
commissioning or during repairs, etc.), precautions must be taken to
ensure that the controllers will never be cooler than the air in the cabinet
once the doors have been shut again, as moisture will otherwise
condense on them. The cooling system must therefore always be in
operation even while the machine is shut down to keep the temperature
of the air in the control cabinet and that of the installed equipment at the
same level.
– Cooling systems with fixed temperature settings must be set to 40
°
C,
not lower!
– Cooling systems with temperature controllers must be set such that the
temperature of the air inside the control cabinet is less than 2
°
C below
that of the air outside the cabinet. Set the temperature limit to 40
°
C!
– Always arrange cooling systems such that condensation water cannot
drip down onto installed controllers. If cooling systems are to be
mounted on top of control cabinets, the cabinet must be specially
designed (see Fig. 12.1)!
– Design the control cabinet such that the fan of the cooling system will
not spray condensation water which has collected while the system is
shut down onto the controllers (see Fig. 12.2)!
2.3.1. Notes on the use of
cooling power systems in
control cabinets
2. Control cabinet design
Proper mounting of cooling
systems
Avoidance of
moisture condensation
Avoidance of water drips
or spray
Moisture condensation risk
Condensation water risk