Valve Characteristics And Curve Settings - Vexve Hydrox HCU Remote Installation, Operation And Maintenance Instructions

7.2.3. Valve characteristics and curve settings

Valve characteristics curve and settings of each valve can be loaded to this page using the function keys
F1 and F2 with left and right arrow icons. You can use the load defaults button, to load defaults of that
actuator type. Once changes have been made, use the F4 button to save changes before changing valve
selection, otherwise the changes will be discarded.
Figure 16. Valve Settings page
Valve characteristics have three main components Time (t), Speed and valve open percentage. The time
t0 is the valve close wait time, t100 valve open wait time and tmax is the maximum time after which the
PLC will switch off the pump control even if the valve is not opened/closed. tmax acts as added safety
feature, so that pump does not run longer than required in case of failing to open or close a valve.
Times t0 and t100 are delays. After a successful valve open or close action from the PLC the motor
switch-off is delayed by the configured waiting times. The speed of the motor/pump can have three differ-
ent values as shown in above picture and they are dependent on the actuator type, size and valve open
percentage.
Pmax or maximum pressure is also a safety logic. If pressure goes over that, the PLC will generate an
error and switch off the pump control even if valve is not open/closed. Note! This functionality is only
present if analog pressure measurement option is selected.
These variables can be adjusted as necessary, but the recommended and factory default settings can be
seen from table 16 on next page.
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