Maintenance and care
Ex p Control Unit
SIEMENS Set
Page 68 of 80
01-37A2-7D0004_SIEMENS_Manual_Exp-Control-Unit_20220216_0_en.docx
Rev. 0
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Error / Fault
Possible cause
Remedy
Digital purge gas valve
switches on briefly
during the operating
phase
Value “po” too high
Reduce “po” value
Pressurized enclosure
leaking, switching value
“p1” not reached
Seal pressurized enclosure
Pressurized enclosure
leaking, switching value
“p1” not reached
Adjust leak compensation
If the pressure drops, the
electrical devices do not
switch off
Key switch switched on
Switch off key switch
Error messages
The control units give plain text messages which are divided into 3 categories.
Positive messages are notifications that do not affect system availability.
Warning messages are notifications that affect parts of the system.
Alarm messages are notifications that lead to the shutdown of the
protected device.
10.4.2.1
Positive messages
Status
Code
Plain text
00000001
Purge process
The control unit has started the purge process.
00000002
Ex p ready
The control unit has successfully completed the purge process. The main switch or
bridge HS_IN / HS_OUT is not closed.
00000003
Ex p active
The control unit has successfully completed the purge process. The main switch or
bridge HS_IN / HS_OUT is closed and enabled
00000004
p3 reached
The setpoint value “p3” purge flow is reached and the purge time counts down.