■ Pressure relief valves
Pressure relief valves protect the system against unacceptable pressure rise. They are factory
set.
■ Enclosures and covers over moving parts and electrical connections:
These protect against accidental contact.
4.6 SIGMA CONTROL MOBIL keys and displays
Fig. 7 Instrument panel keys and displays
Item Sign
Name
Function
Background LED
1
«Acknowledge » key. Acknowledgement key
Acknowledges active and
displayed messages.
Flashes when a message
is active and waiting for
acknowledgement.
2
«Information» key
Displays the event memo‐
ry.
Flashes if a message is
active.
3
«Menu» key
Displays the main menu. –
4
«Horizontal arrows»
change values
«LEFT» and
«RIGHT» keys
Change parameter val‐
ues,
cursor movement when
entering a password.
–
5
«UP» and «DOWN»
keys
Vertical movement in me‐
nus.
Change values in pass‐
word entry.
–
4
Design and Function
4.6
SIGMA CONTROL MOBIL keys and displays
No.: 9_6975 00 E
Service Manual Screw Compressor
M135 SIGMA CONTROL MOBIL
33