Rotary screw compressors with internal pres‐
sure transducer (
pi)
Rotary screw compressors without internal pres‐
sure transducer (
pN)
1. Press the «ON» key. After the motor start is
completed, keep the «LOAD/IDLE» key
pressed. Otherwise, the machine remains in
IDLE and is stopped after two minutes.
The machine switches to LOAD and the ma‐
chine's
pi pressure rises.
2. Monitor on the display the pressure rise
pi
during the TÜV check.
3. Release the «LOAD/IDLE» key immediately
as soon as the safety valve actuates, in or‐
der to prevent unnecessary oil mist.
4. If the measured pressure value
pi increases
to 11 % above the actuating pressure of the
safety valve, immediately release the
«LOAD/IDLE» key.
The safety valve is defective. Shut down the
machine with the «OFF» key and immedi‐
ately replace the safety valve.
5. If the measured pressure value
pi exceeds
the actuating pressure of the safety valve by
2.0bar, the display shows the fault message
pRV ⇞.
The safety valve is defective. De-commis‐
sion the machine. Have the safety valve re‐
placed immediately.
1. Press and hold the « ON » key.
The machine switches to LOAD and the ma‐
chine's
pN pressure rises.
2. Monitor on the display the pressure rise
pN
during the TÜV check.
3. Release the «ON» key immediately when
the pressure relief valve responds, in order
to prevent unnecessary oil mist.
4. If the measured pressure value
pN increa‐
ses to 11 % above the actuating pressure of
the safety valve, immediately release the
«ON» key.
The safety valve is defective. Shut down the
machine with the «OFF» key and immedi‐
ately replace the safety valve.
5. If the measured pressure value
pN exceeds
the actuating pressure of the safety valve by
2.0bar, the display shows the fault message
pRV ⇞.
The safety valve is defective. De-commis‐
sion the machine. Have the safety valve re‐
placed immediately.
Correct conclusion of the test
1. Press «Enter».
The check box
Safety valve will flash.
2. Press the «DOWN» key.
The check box is deactivated.
3. Press «Enter».
The test mode is de-activated and the test is completed.
4. Press «Escape» repeatedly to leave this menu.
5. Open the user's shut-off valve between the machine and the air distribution network.
Result The machine is ready for operation.
Resetting
If the test is cancelled when opening the safety valve, SIGMA CONTROL 2 will indicate the highest
measured value as reached pressure.
To reset the saved value, activate the
Reset check box.
➤ Activate the
Reset check box.
9
Operation
9.12 Check the safety valve
192
User Manual Controller
SIGMA CONTROL 2 SCREW FLUID ≥5.0.X
No.: 9_9450 12 E