1. Open the user's shut-off valve to the air network.
2. Switch on the power supply disconnecting device.
After the controller has carried out a self-test, the green
Control voltage
LED is lit continuously.
3. If required:
Change the display language as described in chapter 7.10.
4. Press the «ON »key.
The compressor motor runs up and after a short time the machine switches to LOAD and deliv‐
ers compressed air.
➤ Watch for any faults occurring in the first hour of operation.
➤ After the first 50 operating hours, check all electrical connections and tighten where nec‐
essary.
Does the machine stop when the compressor motor rotates in the wrong direction?
➤ Switch off and lock out the power supply disconnecting (isolating) device and check that
no voltage is present.
➤ Changeover phase lines L1 and L2.
➤ Acknowledge any existing alarm messages and switches the machine on again.
7.8 Setting the set point pressure
The system pressure pA is factory set to the highest possible value.
Adjustment is necessary for individual operating conditions.
Do not set the set point pressure of the machine higher than the maximum working pressure
of the compressed air system.
The machine may not toggle more than twice per minute between LOAD and IDLE.
To reduce the cycling (toggling) frequency:
➤ Increase the difference between cut-in and cut-out pressure.
➤ Add a larger air receiver downstream to increase buffer capacity.
➤ Set the set point pressure as described in the SIGMA CONTROL 2 operating manual.
7.9 Checking the door interlock switch
The interlock switch automatically stops the machine as soon as the secured front access panel is
opened.
Check the interlock switch function when commissioning or re-commissioning the machine.
The door interlock switch is an important safety device.
The machine may only be operated with a correctly functioning interlock switch.
7 Initial Start-up
7.8 Setting the set point pressure
46
Operating Manual Rotary screw compressor
SK 901848 21 E
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