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. 22 Switching on and off
1
LED
Machine ON (green)
2
«ON» key
3
«OFF» key
8
LED
Controller ON (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 lights continuously.
2. Press the «ON» key.
The green
Machine ON LED lights continuously.
If a power failure occurs, the machine is not prevented from re-starting automatically when
power is resumed.
It can re-start automatically as soon as power is restored.
Result The compressor motor starts as soon as system pressure is lower than the setpoint pressure (cut-
out pressure).
8.1.2 Switching off
Depending on current operating condition, the machine shuts down after a protective run-on period.
8
Operation
8.1
Switching on and off
46
Service manual Screw compressor
Aircenter SX 3/7.5 SIGMA CONTROL BASIC
Number: 9_6945 01USE
