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
ON
LED
2 «ON» key
3 «OFF» key
8
Voltage applied to controller
LED
11 «LOAD/IDLE» toggle key
19
LOAD
LED
20
IDLE
LED
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 isolating device.
The
Voltage applied to controller
LED lights green.
2. Press the «ON »key.
The
ON
LED lights green.
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 set point pressure (cut-
off pressure).
8.1.2 Switching off
1. Press the «OFF» key.
The machine switches to IDLE and the
IDLE
LED flashes. The SIGMA CONTROL 2 displays
Stopping
. The
ON
LED extinguishes as soon as the automatic shut-off action is completed.
2. Switch off and lock out the power supply disconnecting device.
8 Operation
8.1 Switching on and off
52
Operating Manual Screw Compressor
ASK 901824 12 E
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