Technical Specifications

Masoneilan Valves ValVue ESD Instruction Manual =| 243

 Maximum Time – The allowed amount of time in seconds before the PST test aborts.

This value can be determine as follows: Maximum Time = (Travel Range * 2 * PST

Speed) + Dwell Time +5 seconds.

 PST Speed - The valve travel speed in % Travel per second.

 Dwell Time - The amount of time in seconds between the down ramp and the up ramp

of valve stroke.

 Friction Low Limit - The alarm threshold for low friction. This alarm is set if the

analyzed friction from the PST test is less than this value. Engineering units of pressure

(PSI, kPa or BAR).

 Friction High Limit - The alarm threshold for high friction. This alarm is set if the

analyzed friction from the PST test is more than this value. Engineering units of

pressure (PSI, kPa or BAR).

 Breakout Limit - The alarm threshold for valve breakout force (force to initiate valve

movement). This alarm is set if the analyzed friction from the PST test is more than this

value. Engineering units of pressure (PSI, kPa or BAR).

 Droop Limit - The alarm threshold for air supply inlet droop. This alarm is set if the

analyzed Air Supply Droop from the PST test is more than this value, indicating a

possible clogged up air filter in the air set or lack of volume feeding the SVI II ESD.

Engineering units of pressure (PSI, kPa or BAR).

 Freeze DO (Digital Output) – Enable for the DO2 (SW#2) to not change state during a

PST.

 Freeze AO (Analog Output) - Enable for the built-in PST controller transmitter to not

update its output value during a PST.

 Enable Schedule - Enable to allow execution of the Automated PST Schedule.

 Set - Click to save PST configuration.

PST Travel

When configuring the PST Travel, since this is a Partial Stroke Test, you set the parameter as a

percentage of the total valve travel. The range for PST Travel is between 5% and 30%. If you

set a value outside the 5 - 30% range an error message appears (Figure 253).

Figure 253 PST Travel Error Message