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Instruction Manual
Detailed Setup
August 2012
D103409X012
will be a minimum value. For those actuators that fill from the test starting point, the pressure limit will be a maximum
value. The pressure signal used for this threshold depends on relay type and is summarized below.
Relay Type
A or C
B
B Special App.
C Special App.
Pressure Signal
Port A - Port B
Port B - Port A
Port B
Port A
PST Press Limit (double-acting actuators)— During the Setup Wizard or Auto Calibration, the Partial Stroke Pressure Limit
value will be set to a negative value for actuators where the Partial Stroke Start Point is opposite of the Zero Power
Condition (e.g., Partial Stroke Start Point= Open and Zero Power Condition = Closed) and to a positive valve for
actuators where the Partial Stroke Start Point is the same as the Zero Power Condition.
To set the partial stroke pressure limit manually for single acting actuators select min pressure. Select min diff press for
double acting actuators.
Note
In order to manually set the partial stroke pressure limit with the correct value, you must be able to run a valve signature test using
ValveLink software. It is then possible to set the partial stroke pressure limit with the Field Communicator, using the information
generated by the valve signature test.
To manually set the partial stroke pressure limit, disable the travel deviation alert by setting Travel Dev Alert Pt to
125%. Also disable “end point pressure control” and disable the partial stroke pressure limit by setting the values
shown in table 4‐9.
Table 4‐9. Values for Disabling Partial Stroke Pressure Limit
Actuator Type
Relay Type
Zero Power Condition
Closed
A or C
Open
Single Acting
Closed
B
Open
Closed
Double Acting
A
Open
Partial Stroke Start Point
Partial Stroke Pressure Limit (Disabled)
Open
0.0
Closed
Psupply
Open
Psupply
Closed
0.0
Open
Psupply
Closed
0.0
Open
0.0
Closed
Psupply
Open
-Psupply
Closed
Psupply
Open
Psupply
Closed
-Psupply
Run the partial stroke test using the Field Communicator. Once the test is completed download the partial stroke test
results using ValveLink software.
Select the Press/Time radio button from the partial stroke valve signature graph. If actuator pressure starts high and
moves low, find the minimum actuator pressure, Pmin. Otherwise, find the maximum actuator pressure, Pmax. Use
table 4‐10 to estimate the partial stroke pressure limit.
The default value is 0.
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