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Ex p Control unit
APEX
px
Rev. 0
Digital purging gas valve
does not switch to the
small nozzle after the pre-
purging phase
Control unit does not
switch on the electrical
devices after the pre-
purging phase
The control unit switches
off the electrical devices
after the purging time with
a time delay
Relays K4 or K5 do not
switch
Digital purging gas valve
switches on briefly during
the operating phase
If the pressure drops, the
electrical devices do not
switch off
01-37A2-7D0001_px_Manual_Exp-Control-Unit_20210923_0_en.docx
Maintenance and care
Temperature sensor is
connected, internal
temperature too high
Main switch or bridge to
the terminals Hs_In /
Hs_Out not connected
Purging gas valve does not
close
Pressure in the enclosure
higher than the switching
value "p4"
Switching value "p4" too
low
Pressurized enclosure
leaking, switching value
"p1" not reached
Leakage air needle of
digital valve too small
Switching value "p3" too
high
Wrong selection of
switching parameters
Value "po" too high
Pressurized enclosure
leaking, switching value
"p1" not reached
Pressurized enclosure
leaking, switching value
"p1" not reached
Key switch switched on
Wrong purge program
selected
Check purging gas valve
for foreign particles in the
mechanical part
Wait until the increased
flow rate has caused the
internal temperature to
drop or check the set
temperature switching
value
Switch on main switch or
connect bridge to terminal
Hs_In / Hs_Out
Check purging gas valve
for disconnected supply
voltage
Reduce the flow rate of
the air leak needle
Check switching value
"p4"
Seal pressurized
enclosure
Increase the air flow rate
of the leakage air needle
Check switching value
"p3"
Check switching
parameters
Reduce "po" value
Seal pressurized
enclosure
Adjust leak compensation
Switch off key switch
Correct purge program
Page 87 of 96
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