8 Operation
8.1 Switching On and Off
Always switch the machine on with the «ON» key and off with the «OFF» key.
A power supply disconnecting device has been installed by the user.
Fig. 15 Switching on and off
1
Machine ON LED (green)
2
«ON» key
3
«OFF» key
8
Controller on LED (green)
8.1.1 Switching on
Precondition No personnel are working on the machine.
All access doors and panels are closed and secure.
1. Switch on the power supply disconnecting device.
After the controller has carried out a self-test, the green
Controller on LED is lit continuously.
2. Press the «ON» key.
The green
ON LED lights continuously.
If a power failure occurs, the machine is not prevented from automatic re-starting.
It can start automatically again as soon as power is restored.
Result The compressor motor starts as soon as system pressure is lower than the setpoint pressure (cut-
off pressure).
8.1.2 Switching off
1. Press the «OFF» key.
The machine is ready to operate as soon as the
Machine ON LED is extinguished. The ma‐
chine can be started again.
2. Switch off and lock out the power supply disconnecting device.
The machine is switched off and isolated from the power supply. The
Controller Power LED
extinguishes.
8
Operation
8.1
Switching On and Off
9_6917 34 USE
Operator Manual Screw Compressor
AIRTOWER 3C–7.5C Tri-Voltage
49
