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Malfunctions
10.3.4Pneumatic time delay
Fault description
Delay time is incorrect
Time delay unit does
not function
Control pressure is not
released
10.3.5Limit switch, pneumatically operated
Fault description
Limit switch does not
switch
Limit switch does not
switch
Limit switch does not
switch
98
Cause
Time setting is adjusted
Incorrect test gas and/or
incorrect test pressure
set
Sinter filter/silencer on
vent [3] is contaminated
Pneumatic pilot line to
operating connection
[2] has a leak
Pneumatic pilot line to
pressurized connection
[1] is depressurized
Valve does not open in
spite of pneumatic actu-
ation (valve defective or
contaminated)
Cause
Limit switch is mis-
aligned
Limit switch is defective
Pneumatic pilot line is
faulty
Operator's Manual | Oxeo PR LCP | F_101821 Rev 02 | 08-2022 | en
Remedy
Correct the time set-
ting
Use nitrogen (N
) test
2
gas at a test pressure
of 109 psi (7.5 bar)
Clean or replace sinter
filter/silencer
Check the union and
hose line; seal and
replace if necessary
Check the pilot cylin-
der, pressure reducer,
etc. and repair if nec-
essary
Replace time delay
unit
Remedy
Readjust the limit
switch
Replace the limit
switch
Check the pneumatic
pilot line and repair if
necessary
Personnel
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