High-Pressure Modular Controller
Diagnostics
57
Measure
The Measure diagnostics menu provides information on each PMM connected:
PMM
– This is the PMM range and name.
Pressure
– This is the pressure measured by the sensor in the PMM.
Temperature
– This is the ambient temperature inside the PMM. The
temperature inside the PMM can be as much as 5
C higher than room
temperature during normal operation.
Test Valve and Ref Valve
– This is a normally-closed isolation valve installed on
the internal pressure manifold in front of each PMM. The test valve isolates
pressure to the PMM and is controlled by the internal software. When a PMM is
selected in the Module Selection menu, the test valve should be open. For
manual testing and troubleshooting, select a single PMM and test the valve. In
other modes such as Fast and Auto, the Product opens and closes the valves
based on a control algorithm. If the status is different than that described, the
valve may be malfunctioning. See the Service Manual for replacement
instructions.
The menu also has a Pneumatic Self Test function located at the bottom of the
menu that automatically tests each PMM to see if the valves are opening and
closing properly. The system controls pressure as necessary and monitors the
valve states. If a valve is not functioning properly, an error with information is
shown that indicates which valve is malfunctioning. Slots with modules installed
will be included in the self test. To test all slots, it may be necessary to move
modules and run the test again. No errors show if the test passes.
Control
The Control Diagnostics menu provides information about the PCM:
Readings
–
This menu shows the pressure measurement at the test port, supply
port, and exhaust port.
Control Module
– This menu shows the PCM model number, serial number, and
firmware revision.
Control Coefficients
– This menu shows the control coefficients (C0) the PCM
is using. The Controller continuously tunes itself during normal control. There is
no user Autotune function.
Tune Reset
– For each setpoint, the controller measures when the control valves
open and how quickly the valves change pressure. Operation during adverse
conditions, for example, with no supply pressure or with the test volume open to
atmosphere, may cause invalid values to be stored. Tune reset reverts these
values to factory conditions. After a tune-reset is performed, control may exhibit
more overshoot or longer set times for the first few setpoints.
