2. Scroll to parameter 3 "Pressure relief valve check mode" with the arrow keys and confirm by
depressing the «Enter» key for at least three seconds.
3. Enter the password "BASIC" and confirm with the «Enter» key.
4. Use the arrow keys to select parameter "on" and confirm.
5. Observe the display of pressure on SIGMA CONTROL BASIC while depressing and holding
the «ON» key.
6. Stop the test as soon as the safety relief valve blows off or working pressure rises to 10%
above the activating pressure of the safety relief valve.
7. If the safety relief valve is defective, switch off the machine, depressurize completely and re‐
place the valve.
10.14.4 Returning the machine to operational
1. Call up the edit mode again and enter the password "BASIC".
2. Use the arrow keys to set the parameter to "off" and confirm with the enter key.
3. Open the user's shut-off valve between the machine and the air distribution network.
10.15 Check the safety shut-down due to excessive airend discharge
temperature.
The machine should shut down if the airend discharge temperature reaches a maximum of 230 °F.
➤ Have the safety shutdown function checked by an authorized KAESER service representative.
10.16 Testing the EMERGENCY STOP push button
Fig. 30 Testing the EMERGENCY STOP push button
9
EMERGENCY STOP push button
Precondition The compressor motor is running.
1. Press the EMERGENCY STOP push button.
The compressor motor stops, the pressure system is vented, and the machine is prevented
from automatically restarting.
The compressor motor does not stop?
The safety function of the EMERGENCY STOP push button is no longer ensured.
➤ Shut down the machine immediately and call an authorized KAESER service representa‐
tive.
10 Maintenance
10.15 Check the safety shut-down due to excessive airend discharge temperature.
76
Operator Manual Screw Compressor
AIRTOWER 3C–7.5C Tri-Voltage
9_6917 34 USE
