Manual Mode; Mechanical Blockage; Parameter 1.Yfct - Siemens SIPART PS2 Service Manual

3.16

Manual Mode

When bottom section of display shows: "MANxx" (xx = input signal), the unit is in Manual
mode. In Manual mode, the unit ignores setpoint command signal. It is possible to use the
● To exit manual mode and allow control using a setpoint, press
– Unit will display: "AUTxx" (xx = input signal), in the lower right-hand corner when in
3.17

Mechanical Blockage

While position deviation exists, determine which output pressure gauge is used to move
valve and eliminate current deviation.
● If the output pressure is equal to supply pressure, then:
– Issue is not the PS2, check for mechanical blockage that is preventing valve
● If the output pressure is unable to reach full supply pressure, then:
– Issue is an air leak somewhere in the output; see Air Leak (Page 16).
● If output pressure is unable to exhaust, check exhaust port for blockage; otherwise,
replace piezo block.
● If PS2 is satisfied with current position deviation, the deadband could be too large; see
Dead Band Too Large (Page 23).
3.18

Parameter 1.YFCT

The two most common options for parameter 1 are WAY and TURN. "WAY" is for linear
actuators which will have feedback arm/linkage connecting the positioner to the actuator.
"TURN" is for rotary actuators which have a direct coupling connecting the positioner to the
actuator.
Firmware version 5.00.00 and newer will have a normal and inverted actuator type for all
Parameter 1 options. Inverted selections are identified with a minus sign. Normal and
inverted refers to the rotation of the PS2's input shaft when the valve or damper closes.
Use Normal:
● Part-turn actuator closes when the positioner shaft or NCS rotates in the clockwise
direction.
● Linear actuator closes when the actuator spindle moves downwards and the positioner
shaft or NCS rotates in the anti-clockwise direction.
PS2 Troubleshooting Guide
Service Manual, 03/2017, A5E36661550-AA
and/or buttons to manually drive the actuator.
Automatic mode.
movement. This could occur in the actuator and/or valve, refer to actuator/valve
service manual.
Troubleshooting Procedures
3.16 Manual Mode
button one time.
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