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Monitoring dryer operation
30
K-MT 1-8/D3
Monitoring dryer operation
The dryer operates fully automatically. However, you should carry out the regular checks
described in the Chapter Maintenance and repair of the dryer.
Warning against sudden air ejection!
During expansion the pressure is released suddenly through the muffl er:
◊ A loud cracking noise occurs which can injure your hearing.
◊ Particles carried in the air fl ow act like bullets and can injure your eyes or
skin.
Always wear eye and ear protection, therefore, when you are in the vicinity of
the dryer!
◊
The more powerful the dryer is, the more noise may be generated during operation. There-
fore, the operator must provide suitable protective equipment (e. g. ear protection).
◊
Only operate the dryer within the permissible limits (see type plate). By operating the dryer
in conditions that go beyond the defi ned values, the dryer is subjected to loads for which it
has not been designed. This may cause functional defects.
◊
Check the dryer regularly for externally visible damage and defects. Any changes, even in
its operating behaviour, must be reported immediately to the competent offi ce or person.
◊
In the event of an emergency or if a safety-relevant disruption occurs (e.g. escaping com-
pressed air, defective component), immediately close the compressed air supply line and set
the ON/OFF switch of the dryer to 0 in order to disconnect it from the power supply. After-
wards depressurise the dryer (see also chapter , page
31). The unit may only be restarted
after all defects have been eliminated.
With dewpoint-sensing control (optional)
Display of dewpoint
If the dryer is equipped with a dewpoint-sensing control system, the digital display at the
front of the switchbox shows the currently measured dewpoint. The range of display is –100
°C (-148 °F) to +20 °C (68 °F).
If the set dewpoint is exceeded, the system automatically completes a switchover between
the chambers. The dewpoint at which a switchover is made is preset at the factory.
After commissioning or extensive maintenance work, check the dewpoint display at the
dryer.
Under certain circumstances, the desired dewpoint is only reached after prolonged operation.
Error messages
If the measured dewpoint exceeds the preset alarm limit (5 °C (41 °F) above the switchover
value), the displayed dewpoint value is fl ashing. In addition, an error message can be issued
through the potential-free busbar.
Error codes and their causes:
Display
Cause
+20 ◊
Upper measuring range limit exceeded
999
◊
Dewpoint sensor defective
sens
o
-999
◊
Dewpoint sensor not powered
◊
Cable defective
◊
Sensor defective
For instructions on how to eliminate faults, see chapter Identify and eliminate faults
