Fisher® FIELDVUE DVC6200 Digital Valve Controller

Instruction Manual
D103605X012
Device Information, Diagnostics, and Alerts
July 2012
Travel History
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.
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.
Figure 5‐2. Cycle Counter and Travel Accumulator Deadband Example (set at 10%)
DEADBAND EXCEEDED, NEW
REFERENCE POINT ESTABLISHED
DEADBAND
REFERENCE POINT
DEADBAND (+/- 5%)
VALVE POSITION
TIME
DEADBAND
DARK SEGMENTS REPRESENT THE AMOUNT OF TRAVEL
THAT WILL BE ADDED TO THE TRAVEL ACCUMULATOR
E1473
CYCLE COUNTER INCREMENTS
Alert Record
Alert Record Not Empty Alert—This alert is active when there are 1 or more alerts stored in the alert record.
Alert Record Full Alert—This alert is active when the alert record is full. Additional alerts that are detected will not be
saved to the alert record until the alert record is cleared.
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