KAESER TG 450, Руководство оператора, Страница: 34 / 116

4.3 Operating points and control modes
4.3.1 Machine operating modes
STOP
The machine is connected to the power supply:
■ The
Controller Voltage
indicator lights green.
■ The machine is switched off.
■ The
ON
indicator is extinguished.
READY
The machine has been activated with «ON»:
■ The
ON
indicator lights green.
■ The refrigerant compressors are switched off.
■ The refrigerant compressors start one after another, as soon as the start conditions are met.
LOAD
The start conditions are met:
■ At least one refrigerant compressor is running.
4.4 SECOTEC CONTROL
The basic requirement for this type of control is a high capacity thermal mass: SECOPACK LS
combined with several refrigerant compressors.
Depending on the load, the controller switches the necessary number of refrigerant compressors
on one after another, thus ensuring even loading. As soon as the temperature in the thermal mass
is sufficiently low, the controller switches one or several refrigerant compressors off, as required.
Due to the high storage capacity the pressure dew point remains stable for a long time.
As soon as there is a new requirement for refrigeration, the controller switches on the required
number of refrigerant compressors in order to cool down the thermal mass again.
Advantages:
■ Low power consumption
■ Low strain on refrigerant compressors
■ Low switching frequency
4.5 Electronic condensate drain
Condensate flows into the collecting tank.
A sensor registers the level and signals this to the electronic control.
When the collecting tank is full, a valve opens automatically and drains the condensate.
The valve immediately closes when the condensate drain is empty. No compressed air is lost un‐
necessarily.
4 Design and Function
4.3 Operating points and control modes
24
Operator Manual Refrigerated Dryer
TG
No.: 901760 02 USE