1. WARNING!
The pressure relief valve may blow off at any time!
Excessive noise is caused when the pressure relief valve blows off!
There is danger of scalding from hot oil.
There is danger of injury from bursting components and compressed air!
➤ Close all access doors and replace and secure all removable panels.
➤ Wear ear and eye protection.
➤ Abort the test if the working pressure reaches 10 % above the blowoff pressure of the
valve.
2. Press the «ON» key for short time.
The machine starts in IDLE.
3. Observe the pressure indication on the SIGMA CONTROL BASIC keep the «ON» key press‐
ed.
4. Stop the test as soon as the pressure relief valve blows off or working pressure rises to 10 %
above the activating pressure of the pressure relief valve.
5. If necessary, vent the machine and replace the defective pressure relief valve.
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.
10.11 Checking the Excess Temperature Safety Shutdown Function
The machine should shut down if the airend discharge temperature reaches a maximum of 110 °C.
➤ Have the safety shutdown function checked by an authorized KAESER service representative.
10.12 Checking the cooling oil level
The sight glass allows a risk-free reading of the cooling oil level. The oil indicator should be fully
filled with oil when the machine is at standstill. The correct oil level cannot be seen.
The ideal situation is with the oil level around the optimum mark when the machine is running.
Operating state
Minimum oil level
Maximum oil level
LOAD
Tab. 55 Permissible cooling oil level under LOAD
In frequency-controlled compressors (SFC) the oil level indicator sis only accurate when the
machine is running at or near maximum speed.
The lower the pressure at the compressed air outlet, the higher the speed.
Precondition The machine has been running at least 5 minutes under LOAD.
10 Maintenance
10.11 Checking the Excess Temperature Safety Shutdown Function
9_5717 20 E
Service Manual Screw Compressor
ASK T SIGMA CONTROL BASIC
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