Bartec APEXpy 07-37A2-2111/ 520Series, Operating Instructions Manual

Page: 88 / 98

Ex p Control unit
APEX py
Maintenance and care
Rev. 0 01-37A2-7D0006_py_Manual_Exp-Control-Unit_20210923_a_en.docx Page 87 of 96
Digital purging gas valve
does not switch to the
small nozzle after the pre-
purging phase
Temperature sensor is
connected, internal
temperature too high 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
Main switch or bridge to
the terminals Hs_In /
Hs_Out not connected Switch on main switch or
connect bridge to terminal
Hs_In / Hs_Out
Purging gas valve does not
close Check purging gas valve
for disconnected supply
voltage
Control unit does not
switch on the electrical
devices after the pre-
purging phase
Pressure in the enclosure
higher than the switching
value ”p4” Reduce the flow rate of
the air leak needle
Switching value “p4” too
low Check switching value
“p4”
Pressurized enclosure
leaking, switching value
“p1” not reached Seal pressurized
enclosure
The control unit switches
off the electrical devices
after the purging time with
a time delay
Leakage air needle of
digital valve too small Increase the air flow rate
of the leakage air needle
Switching value “p3“ too
high Check switching value
“p3”
Relays K4 or K5 do not
switch Wrong selection of
switching parameters Check switching
parameters
Digital purging 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
Wrong purge program
selected Correct purge program