No. SS2-PVS200-0001 Control Valve Maintenance Support System PLUG-IN [R 20] 2nd edition (6) Stick-slip diagnostics Analyzes stick-slip occurrence trends. (7) Open position deviation Collects and compares open position settings to actual control valve open positions, and displays them in a graph. Figure 1. Stick-Slip Diagnostics Screen 2.2 Step Response Test The PLUG-IN Valstaff user can execute a step response test for Control Valves when plant is in shutdown maintenance. The results, which are displayed in a graph, can be used to detect deterioration or other problems in the control valve based on changes in response waveforms compared with other timing test results of the same test pattern. In addition, quantitative dynamic characteristics data such as time constant, delay time, and settling time, which are obtained from the test result, are helpful for performance evaluation of the control valve. The user can be automatically executed this test for multiple control valves. Figure 2. Step Response test Screen 1. Introduction PLUG-IN Valstaff is a valve management system that detects problems with control valves and positioners at the earliest possible stage by monitoring diagnostic parameters and other information from the Smart Valve Positioner, thereby reducing trouble and helping to streamline maintenance tasks by clearly presenting the information required for decision-making on control valve maintenance. PLUG-IN Valstaff monitors diagnostic information 24 hours a day, 365 days a year by communicating with Azbil Corporation’s Smart Valve Positioner, which supports FOUNDATION. fieldbus and HARTR communication. Based on this diagnostic information, at the first sign of an abnormality, the system sends an alert in order to prompt action before the control valve can cause a problem, allowing continuously safe and secure plant operation. PLUG-IN Valstaff also supports quick and accurate startup by automating positioner settings that adiust the control valve status, as well as automating step response tests. It also utilizes diagnostic information for routine maintenance, supporting the creation of an appropriate maintenance plan based on the degree of deterioration of control valves. 2. Function Overview PLUG-IN Valstaff, in combination with Azbil Corporation’s Smart Valve Positioner, achieves its functions of control valve diagnostics monitoring, step response inspection, and auto-setup by means of integration with a device management system. 2.1 Monitoring of Positioner Diagnostic Information By collecting diagnostic parameter data from the Smart Valve Positioner and displaying it in a graph during plant operation, the progress of control valve deterioration and the occurrence of abnormalities can be estimated while the plant is operating. PLUG-IN Valstaff collects data from the positioner and displays the following diagnostics graphs. (1) Total stroke Totalizes the operating distances of the valve stem during valve opening position control. (2) Total shut-off count Counts the number of times valves are completely closed and displays the total close counts in chronological order in a graph. (3) Cycle count Counts the number of times the control valve was reversed and displays them in chronological order in a graph. (4) Travel histogram Displays how frequently the valve operates in a particular opening position area compared to the overall number of occurrences. (5) Maximum travel speed Constantly measures the operating speed of the control valve in both the opening and closing directions, calculates the maximum speed for each day, and then displays the maximum values for opening and closing directions over time. 1 8 1 Specifications are subject to change without notice. “This product is designed for general industrial use.”