GE FVP110, Руководство по обслуживанию

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65
Set Transducer Block Parameters
Setup
3. Set the Tight-shut and Full-open Actions values.
The tight-shut action is an action to decrease the output pressure to a level much lower
than the 0% pressure level, or to increase it much higher than the 0% pressure level for
an air-to-close valve, when FINAL_VALUE.value is less than
FINAL_VALUE_CUTOFF_LO in order to ensure that the valve is tightly shut off.
Conversely, the full-open action is an action to increase the output pressure to a level
much higher than the 100% pressure level, or decrease it much lower than the 100%
pressure level for an air-to-close valve, when FINAL_VALUE.value is larger than
FINAL_VALUE_CUTOFF_HI in order to ensure that the valve is fully open.
A hysteresis of 1% is applied to the thresholds, FINAL_VALUE_CUTOFF_LO and
FINAL_VALUE_CUTOFF_HI.
4. Set the Thresholds for Limit Switches by:
a. Writing the threshold for the upper limit switch to LIMSW_HI_LIM, and the
threshold for the lower limit switch to LIMSW_LO_LIM.
b. Make a DI block read the on/off statuses of a limit switch by setting CHANNEL
to:
❑
2
, for reading the on/off status of the upper limit switch.
❑
3
, for reading the on/off status of the lower limit switch.
Just like hardware limit switches for a valve, on/off status signals can be generated
when the valve position read-back signal FINAL_POSITION_VALUE.value reaches
specified levels. These on/off statuses can be transferred to a DI function block.
A hysteresis of 1% is applied to the thresholds, LIMSW_HI_LIM and LIMSW_LO_LIM.
5. Write the Thresholds for Operation Result Integration Alarms by:
The FVP110 has a function to integrate the following operation result quantities
individually:
❑
TOTAL_CYCLE_COUNT (incremented by 1 at each change in the direction of
the action)
❑
TOTAL_TRAVEL (in % where full stroke = 100%)
❑
TOTAL_OPEN_TIME (in hours)
❑
TOTAL_CLOSE_TIME (in hours)
❑
TOTAL_NEAR_CLOSE_TIM (total at nearly closed time in hours)
❑
SERVO_WARN_COUNT (Total number of times of Servo output drift warning)
a. Setting values for the six items above.
b. Setting limit values for the five items below.
When these values exceed the respective thresholds below, corresponding alarms are
output. Set the thresholds as necessary.