Dyna-Flo Control Valve Services Ltd.
Phone: 780 • 469 • 4000 | Toll Free: 1 • 866 • 396 • 2356 | www.dynafl o.com
P-PS2Q0619A
36
FAQ / TROUBLESHOOTING
AND SOLUTIONS
The most common cause of Failure is a contaminated air supply.
Very clean, dry air is required according to ISO/DIS 8573-1: Class 2.
1 If the valve is not actuating properly...
• Ensure that you have an adequate gas supply pressure to the positioner,
look at the supply pressure gauge and also look at the actuator tag for
maximum allowable pressure or bench set range.
• Check source to ensure that you have power and 4-20 mA available.
• See if the display window on the PS2 is illuminated. If it is not then the
power supply is down or you have lost your 4-20 mA signal.
• If you have both of the above, then switch the unit to manual and see
if the valve will stroke by using the Increase (+) and Decrease (-) Keys
to open and close the valve.
• Check for error code messages on the bottom left hand side of the display
window and consult the manual for code meaning.
2 If PS2 Positioner is hunting...
• Check the signal into the PS2 for interference signal, this could be due
to improper type of wiring.
• Check the 4-20 mA supply signal source, as it may be fl uctuating.
• Check tubing connections after positioner for leaks by performing a
detection test with liquid leak detection solution. The actuator may also be
leaking. Or there may be a loose tube connection.
3 If Positioner does not move valve in either Manual or Auto Mode
• Check the gas supply lines for correct pressure to move valve and actuator.
• Check the regulator for signs of moisture.
• Check inlet fi lters under gauge block on PS2 for plugging.
4 If the PS2 Positioner is constantly venting...
• Peizo block has been contaminated with water or particulate.
• Upper display window shows --- which indicates a fl at spot or no signal
out of PS2 potentiometer.
5 There is a 4-20 mA input to positioner and correct voltage, but no
display and the PS2 will not respond in manual or automatic mode...
• Replace the motherboard or with a new PS2 Positioner.
• Unit may also have been fl ooded with liquids.
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