Blowoff protection and network pressure monitoring are switched off during the test.
➤ Follow the detailed procedure instructions in the SIGMA CONTROL manual.
➤ Operate the machine only with a fully functioning safety relief valve.
Precondition The machine is switched off.
Password level 4 is activated.
WARNING
Safety relief valve blows off.
Excessive noise is caused when the safety 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; 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.
1. Close the user's shut-off valve between the machine and the compressed air system.
2. Read the blowoff pressure on the valve.
(the blowoff pressure is usually to be found at the end of the part identification)
3. Observe the pressure indicator on the SIGMA CONTROL and call up the test function.
4. Stop the test as soon as the safety relief valve blows off or working pressure reaches 10 % above
the blowoff set point.
5. If necessary, vent the machine and replace the safety relief valve.
6. Deactivate the test function.
7. Open the user's shut-off valve between the machine and the compressed air system.
10.12 Checking the Overheating Safety Shutdown Function
The machine should shut down if the airend discharge temperature reaches a maximum of 230 °F.
➤ Check the safety shutdown function as described in the SIGMA CONTROL manual.
The machine does not shut down?
➤ Have the safety shutdown function checked by an authorized KAESER Service represen‐
tative.
10.13 Checking the Cooling Oil Level
In frequency-controlled compressors (SFC) the oil level indicator is only accurate when the
machine is running at or near maximum speed.
The higher the speed, the lower the pressure at the compressed air outlet. The
SIGMA CONTROL displays this valve.
Precondition The machine has been running at least 5 minutes under LOAD.
10 Maintenance
10.12 Checking the Overheating Safety Shutdown Function
9_5708 08 USE
Service Manual Screw Compressor
BSD
73
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