KAESER KOMPRESSOREN SX, Service Manual, Page: 68 / 122

Fig. 21 Checking the cooling oil level
1
Minimum oil level
2
Maximum oil level
3
Optimum level
➤ Check the oil level with machine running under LOAD.
Result Top up when the indicator shows minimum level.
10.10 Pressure relief valve checking
In order to check the activating pressure of the pressure relief valve, the machine's working pressure
is raised above the set activating pressure of the valve.
The controller is switched to the pressure relief valve checking mode to carry out this check. This
checking mode is intended for machines with maximum permissible working pressure less than
15 bar. Pressure relief valves in machines with permissible working pressures higher than 15 bar
must be removed from the machine and tested on a special rig.
➤ Relief valves on machines with maximum permissible working pressure of 15 bar should
be tested only by KAESER Service.
Blow off protection and air system pressure monitoring are switched off during the test.
The machine must be isolated from the compressed air network and completely vented before
undertaking any work on the pressure system.
➤ Never operate the machine without correctly functioning pressure relief valves.
Preparation for the test
Precondition The machine is switched off.
1. Close the user's shut-off valve between the machine and the air distribution network.
2. Read off the activating pressure on the valve.
(the activating pressure is usually to be found at the end of the part identification)
3. 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.
4. Enter the password "BASIC" and confirm with the «enter» key.
5. Use the arrow keys to select parameter "on" and confirm.
10 Maintenance
10.10 Pressure relief valve checking
58
Service Manual Screw Compressor
SX SIGMA CONTROL BASIC
9_6919 04 E