Owner's manual

Table 5-1. Troublesbooting Chart.
PROBLEM CAUSE
1. Ermtic Operation
pilot valve sticking
CORRECTION
Clean or repiace pilot valve. Refer to paragraph
6-4 for cleaning procedures and paragraph 7-2c
for replacement procedures.
Lhlkage bhuli”g or loose. Linkage pivot joints corroded, dirty, or worn.
Clean and lubricate or replace parts.
2. No response born power Manual lock engaged
Disengage manual lock.
positioner to a signal air
pressure change
Air supply shut-off valve closed open air supply valve.
Ruptured receiver diaphragm
Replace diaphragm. Refer to paragraph 7-2d.
3. Power Positioner does Cylinder bead gasket leak Replace leaking gasket. Refer to paragraph 7-2e.
not remain at setpoint,
co”thnles to cycle
By-pass valve air connection loose
Tighten or replace air connection.
By-pass valve leaking internally. Replace by-pass valve.
4. System over shoots or
under shoots setpoint
l/P oat of calibmtion
l/P faihm?
Calibrate I/P. Refer to paragraph 4-3.
Replace I/P per paragraph 7-2b.
Piston stroke have1 not property set
Calibrate piston stroke. Refer to paragraph 4-2.
I
cam bent Replace cam. Refer to paragraph 7-2f.
Pin hole in diaphragm Replace diaphragm. Refer to paragmph 7-2d.
I
Air fdter/separator fall of water,
I
Drain air tiMcr/separator. Refer to paragraph 6-5.
oil, or sediment.
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5. Sluggish operation
Air fdter dirty
Ambient temperature is lower than
the power positioner is designed
for.
Replace filter element. Refer to paragraph 7-2~
Install power positioner heater.
6. Power positioner oper- Device being controlled has a Repair or replace controlkd device.
atcs normally but flow broken valve stem or connection to
that is wig controlled the linkage.
remains unchanged
,a-Kr-20-l
5-3/s-4