Troubleshooting Procedures
3.8 Deadband Too Large
PS2 Troubleshooting Guide
Service Manual, 03/2017, A5E36661550-AA
23
How to customize tuning parameters:
● Enter Diagnostic Mode:
– When device is in Auto mode, press and hold all three buttons down at the same time:
, , .
– Diagnostic name is shown in lower right of display.
● Edit Tuning Value:
– Go to desired diagnostic parameter by pressing and releasing
button. This will
advance through the diagnostic menu.
○ To go backwards in the menu: While pressing and holding
button, press and
release
button.
– Once at the desired tuning parameter: Press and hold
button until number starts to
change.
– Use
and/or buttons to achieve desired tuning value.
● Exit Diagnostic Mode:
– Press and hold
button until display changes.
– If unit is in Manual mode, press
button once to go to Auto mode.
The deadband of the PS2 is the area around setpoint when the PS2 stops working to get
closer to setpoint. For example, if the deadband value is 0.5 %, and the setpoint is 70 %, the
PS2 will work the piezo valves to get within the following position range: 69.5 to 70.5 %. If
the deadband is too large, the PS2 may not achieve a desired position.
There are two settings for the PS2 deadband:
Auto or a fixed numerical value.
● When configuration parameter "DEBA" = "Auto", the deadband value is dynamic and
changes per process conditions.
● When configuration parameter "DEBA" is a fixed numerical value, the PS2 will always
move the valve to get within this range of the setpoint.
● The current deadband value can be viewed in diagnostic mode:
– While in automatic mode, press all three buttons down at the same time for 5 seconds.
– Press
button until diagnostic parameter "DBUP" or "DBDN" is shown.
– These diagnostic parameters show the current deadband value for up and down valve
directions.
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