Fluke 710 Product Manual - Page 41

Speed Test, Speed Test, Discard

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Shop for Fluke products online at: www. MyFlukeStore.com 1.888.610.7664 709/709H/710 Users Manual If the positioner is configured to be reverse acting, the relationship of mA signal to control valve opening and closing is reversed. Configuration for forward or reverse action does not change the mode in which the valve fails. TV: This variable is the pressure applied to the pneumatic actuator by the valve positioner. With 4 mA applied in a Direct Acting positioner, the minimum or 0 psi of pressure is applied and the valve spring holds the valve into the failure mode position (FO or FC). With 20 mA applied, the direct acting actuator has maximum pressure applied to the actuator from the positioner moving it to the 100 % position and the opposite of the failure position. Reverse acting actuators respond opposite of direct acting actuators with 4 to 20 mA signals applied. QV: This is the position feedback variable (0 % to 100 %). The position feedback variable should agree closely with the Setpoint variable (SV). If it does not, the positioner should be calibrated to better match the position of the valve or repair is required. To run the manual test: 1. Push the ,  and  to change the valve position and the mA output. 2. Manually compare the variable to what is expected. Note When the Valve Test is set to ON (Figure 13),  changes the mA signals to step with stops at 3.8 mA, 4.2 mA, 19.8 mA, and 20.2 mA to make manual valve testing easier (see Valve Test). Speed Test The Speed Test is a test of the time it takes to open and close the valve. To set up the expected time to cycle the valve in seconds from 10 seconds and up: 1. Move the cursor to the digit to change. 2. Rotate the selection knob to change the time value. 3. Push the selection knob to input the change. Figure 54. Speed Test To run the test: 1. Push  to start the test. • Good test result: the position variable is as expected. • Marginal test result: the position variable value is found to be close to the test tolerance. • Bad test result: the position variable deviation values vary greater than the tolerance. 2. Select Save to save the test results and upload later to the ValveTrack software. Or, select Discard if you do not want to save the test result. 36

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709/709H/710
Users Manual
36
If the positioner is configured to be reverse acting, the relationship
of mA signal to control valve opening and closing is reversed.
Configuration for forward or reverse action does not change the
mode in which the valve fails.
TV:
This variable is the pressure applied to the pneumatic actuator
by the valve positioner. With 4 mA applied in a Direct Acting
positioner, the minimum or 0 psi of pressure is applied and the
valve spring holds the valve into the failure mode position (FO or
FC). With 20 mA applied, the direct acting actuator has maximum
pressure applied to the actuator from the positioner moving it to
the 100 % position and the opposite of the failure position.
Reverse acting actuators respond opposite of direct acting
actuators with 4 to 20 mA signals applied.
QV:
This is the position feedback variable (0 % to 100 %). The
position feedback variable should agree closely with the Setpoint
variable (SV). If it does not, the positioner should be calibrated to
better match the position of the valve or repair is required.
To run the manual test:
1.
Push the
,
and
to change the valve position and
the mA output.
2.
Manually compare the variable to what is expected.
Note
When the Valve Test is set to ON (Figure 13),
changes the mA signals to step with stops at 3.8 mA,
4.2 mA, 19.8 mA, and 20.2 mA to make manual valve
testing easier (see
Valve Test)
.
Speed Test
The Speed Test is a test of the time it takes to open and close the
valve.
To set up the expected time to cycle the valve in seconds from
10 seconds and up:
1.
Move the cursor to the digit to change.
2.
Rotate the selection knob to change the time value.
3.
Push the selection knob to input the change.
Figure 54. Speed Test
To run the test:
1.
Push
to start the test.
•
Good test result: the position variable is as expected.
•
Marginal test result: the position variable value is found to
be close to the test tolerance.
•
Bad test result: the position variable deviation values vary
greater than the tolerance.
2.
Select
Save
to save the test results and upload later to the
ValveTrack software.
Or, select
Discard
if you do not want to save the test result.
Shop for Fluke products online at:
1.888.610.7664
www.
MyFlukeStore
.com