Tubing Lines Configuration; Unit Not Initialized; Valve Block Failure - Siemens SIPART PS2 Service Manual

Troubleshooting Procedures

3.27 Tubing Lines Configuration

Note
Stroking times should not be faster than 1 second.
• Stroking times flash on display during RUN 3.
• Stroking times are found in Diagnostic menu, parameter "TUP" and "TDOWN".
3.27 Tubing Lines Configuration
See Fail Position Chart.
3.28

Unit Not Initialized

See Initialization Procedure (Page 50).
3.29

Valve Block Failure

Valve block failure can occur for several reasons. The most common failure is a result of
poor air quality, which can include moisture. In addition to an air drying system, it is
recommended to install a coalescent filter on the supply line, directly upstream of the
positioner. Siemens offers an Air Coalescing Filter, Model 2306, which removes dirt, oil,
moisture, and other impurities from instrument-air supply.
In addition, exceeding the recommended supply pressure will damage the valve block. The
maximum pressure rating for the PS2 is: 101 psi (7 bar), see Supply Air Too High (Page 50).
It is recommended to install a regulator on the supply line, upstream from the positioner, and
to regulate supply pressure so it does not exceed the maximum pressure rating of the PS2
and the actuator. Siemens offers a filter regulator, Model 91H, which regulates pressure and
removes debris.
Note
The 91H filter regulator does not remove moisture.
Valve Block Testing
The following tests will refer to gauges on the supply and output(s) pneumatic lines. If the
PS2 does not have a gauge block, consider temporary gauge installation (in line) for
diagnostic purposes. Pipe plugs may also be needed; either ¼ inch NPT or G¼ thread.
Verify pneumatic port thread type before inserting pipe plugs - refer to model code and
SIPART PS2 catalog sheet.
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PS2 Troubleshooting Guide
Service Manual, 03/2017, A5E36661550-AA