Instruction Manual
Instruction Manual
D103557X012
Device Information, Diagnostics, and Alerts
January 2015
51
D Travel Alert Lo Lo—This alert is active when the Travel is below the Travel Alert Lo Lo Point. Once the alert is active,
the alert will clear when the Travel exceeds the Travel Alert Lo Lo Point plus the Travel Alert Deadband.
D Travel Cutoff Hi Alert—This alert is active when the Travel exceeds the Hi Cutoff Point.
D Travel Cutoff Lo Alert—This alert is active when the Travel falls below the Lo Cutoff Point.
D Integrator Saturated High Alert—This alert is active if the instrument integrator is saturated at the high extreme.
D Integrator Saturated Low Alert—This alert is active if the instrument integrator is saturated at the low extreme.
D Pressure Fallback Active Alert—This alert is active when the instrument has detected a problem with the travel
feedback and is now controlling the output like an I/P transducer.
CAUTION
If a Valve Stuck alert is active, there may be potential energy stored in the valve and actuator assembly. Sudden release of
this energy may cause the valve to suddenly open or close, resulting in equipment damage.
D Valve Stuck—A partial stroke test has failed.
If the valve sticks while performing the partial stroke test, the digital valve controller will not fully exhaust or fill the
actuator pressure in its attempt to complete the partial stroke. Rather, the instrument will abort the test and this alert
will be active. It is recommended that the Travel Deviation alert also be enabled and configured. The Valve Stuck alert
will be active if either the Travel Deviation alert is active or if the actuator pressure reaches the Partial Stroke Pressure
Limit.
Travel History
D Cycle Count High Alert—This alert is active if the Cycle Counter exceeds the Cycle Count Alert Point. The Cycle Count
records the number of times the travel changes direction when it is outside of the deadband. To clear the alert, set
the Cycle Counter to a value less than the alert point.
D Travel Accumulator High Alert—This alert is active if the Travel Accumulator exceeds the Travel Accumulator Alert
Point. The Travel Accumulator totalizes the travel of the valve when the deadband is exceeded. To clear the alert,
set the Travel Accumulator to a value less than the alert point.
Note
The Cycle Count / Travel Accumulator Deadband applies to both the Cycle Count High Alert and the Travel Accumulator High
Alert.
The deadband is the percent (%) of ranged travel around a travel reference point. The travel reference point gets
reestablished to the point of travel reversal that occurs outside of the deadband. The deadband must be exceeded
before a change in travel direction will be counted as a cycle and the accumulated travel (up to the point of travel
reversal) is added to the total accumulation. See figure 5‐2.