Siemens SIPART PS2 Service Manual

Troubleshooting Procedures
3.29 Valve Block Failure
PS2 Troubleshooting Guide
40 Service Manual, 03/2017, A5E36661550-AA
If PS2 can output full supply pressure and fully exhaust, then something else is preventing
actuator from fully closing or opening. Check valve assembly for mechanical blockage and
air leaks. Also verify supply is at required pressure for application.
● If possible, drive actuator/valve to a mid-travel position (50 %).
Does air pressure hold
when the buttons are released?
– If yes, the valve block/PS2 is working correctly.
– If not, check for leaks and perform the Pipe Plug Test at the end of this section.
●
Does the unit exhaust?
– For double-acting, the unit should always exhaust during movement. For single-acting,
the unit will only exhaust in one direction.
– If one of the output ports does not exhaust, check exhaust port for blockage.
○ If exhaust port is free from blockage, go to Pipe Plug Test at the end of this section.
– If unit always exhausts, verify parameter "PNEUM" is set correctly.
○ "Std" = Standard Valve Block or "FIP" = Fail in Place Valve Block ("F01" at end of
the model code indicates FIP option).
○ If this is set correctly, go to the Pipe Plug Test.
Pipe Plug Test
● Turn off supply air to PS2.
WARNING
High Pressure
High pressure output port(s) may still contain air pressure and can cause injury. Use
caution when removing pneumatic connections.
● Slowly remove pneumatic connections from output port(s) on the positioner.

Siemens SIPART PS2 Specifications

General

Supply Pressure	1.4 to 7 bar (20 to 100 psi)
Enclosure Rating	IP66/NEMA 4X
Communication Protocols	HART, PROFIBUS PA, FOUNDATION Fieldbus
Output Pressure	0 to 100% of supply pressure
Hazardous Area Certification	ATEX, IECEx, FM, CSA
Type	Electropneumatic
Input Signal	4-20 mA
Rotation Angle	30° to 90°
Operating Temperature	-40°C to +80°C
Mounting	Linear and rotary actuators
Air Consumption	Typically less than 0.1 kg/h