Troubleshooting Procedures
3.22 Setpoint Ramping
PS2 Troubleshooting Guide
Service Manual, 03/2017, A5E36661550-AA
35
The setpoint ramp is only effective in Automatic mode. This parameter changes the
positioner’s speed of response. Essentially, this slows down the valve travel times. To
achieve the fastest times, these parameters should be set to a value of zero.
● From Manual or Automatic mode press and hold
button for 5 seconds to enter
configuration menu.
– Pressing the
will advance through the parameters.
● Go to parameter "TSUP" and "TSDO".
– Use the
and/or button to change the values.
● To return to Automatic mode, press and hold
button for 5 seconds.
– The unit will now be in Manual mode.
● Press
button once to return to Automatic mode.
When PS2 is in automatic or manual mode, the input signal is shown in the lower right
corner of display. This value is in percent, and should change with a change of input signal.
Use PS2 diagnostic number "mA" to convert display to current meter.
● From automatic mode or manual mode, press all three buttons down at the same time for
5 seconds.
● Press and release
button and go to diagnostic parameter "mA."
● The display will show input signal in milliamps.
If milliamp is approximately fixed to 22.0 mA, this indicates the board was or still is
improperly powered.
● To exit Diagnostic mode press and hold
button until display changes.
For 2-wire loop power the power supply must be a regulated current source. A current
source regulates current; see Wiring (Page 43) section.
Note
A voltage source does not regulate current, the circuit’s resistance does. Therefore if the
circuit’s resistance is low, the current can be too high and damage the PS2 board.
● Resolve power issue and replace PS2 circuit board. Board part numbers can be found in
PS2 Operating Instructions P/N#: A5E00074631, or contact Siemens.
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