Colortronic CTT 250, Operating Instructions Manual

Page: 61 / 93

6.1. General Information
The dehumidified air dryers were developed for drying plastic granules. Due to their compact con-
struction, they can be employed next to the processing machine (drying hopper on the processing
machine) or with one or more drying hoppers as a movable facility (compact facility).
The dryers work according to the dehumidified air principle, i.e., the air is not only heated but also
dehumidified before it flows through the drying hopper.
In this manner, plastic granules can be dried down to a very small residual moisture content.
The drying takes place continuously, i.e., there are no rest periods due to regeneration of the dry-
ing agent.
F
The dryer is rated for continuous operation.
All function sequences are fully automatic.
The dryer is equipped with two drying cells. One drying cell is part of the drying cycle; the other
drying cell is regenerated simultaneously.
If a malfunction occurs in the drying cycle during the program run, regeneration is not interrupted,
but continues until the program end has been reached. This guarantees that one regenerated
drying cell is always available.
The air inside the switch cabinet is cooled by a cooling appliance for the protection of temperatu-
re-sensitive components (if present, optional).
With the digital timer (optional) the dryer can be switched on and off at set times.
Dew point dependent regeneration switch (optional)
The dew point temperature is monitored continuously. The valve system switches to the freshly
regenerated drying cells only after the selected dew point temperature has been reached. The hu-
mid drying cells are then regenerated. After the cooling time the drying cells are ready for operati-
on again. The valve system switches to the freshly regenerated drying cells only after the moistu-
re content of the drying cells which are in the drying cycle have reached the setpoint value.
64.10-0260GB05
06/03
CTT 250
Functional description 6-2