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. 16 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
Power 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 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-
out pressure).
8.1.2 Switching off
Depending on current operating condition, the machine shuts down after a protective run-on peri‐
od.
8
Operation
8.1
Switching On and Off
52
Service Manual Screw Compressor
ASK T SIGMA CONTROL BASIC
9_5717 20 E
