Limit Switch, Pneumatically Operated; Makrofon - Viking Oxeo Installation And Maintenance Manual

Fault description
Time delay unit does
not function
Control pressure is
not released

9.5 Limit switch, pneumatically operated

Fault description
Limit switch does not
switch
Limit switch does not
switch
Limit switch does not
switch

9.6 Makrofon

Fault description
The makrofon is not
activated
Inst. and Maint. Manual | Oxeo PR LCP | F_101921 Rev 02 | 10-2022 | en
Cause
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 actua-
tion (valve defective or
contaminated)
Cause
Limit switch is misaligned
Limit switch is defective
Pneumatic pilot line is
faulty
Cause
The pilot line is interrupted
The strainer is dirty
The pilot line is blocked
The pneumatic pilot line is
depressurized
Remedy
Use nitrogen (N2) test 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 cylinder,
pressure reducer, etc. and
repair if necessary
Replace time delay unit
Remedy
Readjust the limit switch
Replace the limit switch
Check the pneumatic pilot
line and repair if necessary
Remedy
Identify the line segment
and replace if necessary
Remove and clean or replace
the strainer
Clean the pilot line
Inspect the pilot cylinder,
pressure reducer, etc. and
repair if necessary
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