4.9 Operating modes and control modes
4.9.1 Machine operating modes
STOP
The machine is connected to the power supply.
The
voltage applied to controller LED lights green.
The machine is switched off. The
on LED is extinguished.
READY
The machine has been activated with «ON»:
■ The
on LED lights green.
■ The drive motor is stopped.
■ The inlet valve is closed.
■ The minimum pressure/check valve isolates the oil separator tank from the air system.
■ The venting valve is open.
The compressor motor starts as soon as pressure is demanded.
LOAD
The compressor motor runs under load.
■ The inlet valve is open.
■ The compressor block delivers compressed air to the system.
4.9.2 START-STOP control
Using the selected control mode, the controller toggles the machine between the operating modes
LOAD and READY in order to compensate for air being drawn by consumers and to maintain the
system pressure between the set minimum and maximum values.
The machine automatically continues to run under LOAD if the duty cycle is too low. This
event lasts maximally a few minutes.
A sufficient duty cycle prevents harmful condensate.
4.10 Refrigerated dryer control modes
The controller can work in the following control modes:
■ CONTINUOUS
CONTINUOUS
In this mode the refrigerated dryer runs continuously, even if the compressor is not running.
The refrigerated dryer is switched off together with the compressor.
4.11 Options
The options available for your machine are described below.
4
Design and Function
4.9
Operating modes and control modes
9_6917 34 USE
Operator Manual Screw Compressor
AIRTOWER 3C–7.5C Tri-Voltage
33