Function Description; Overview; Valve Control And Position Indication - Vexve Hydrox HCU Remote Installation, Operation And Maintenance Instructions

5. Function description

5.1. Overview

The Hydrox HCU Remote is designed to control between 2 and 6 valves operated with hydraulic actuators
and used in different applications. These actuators are operated by a semi-closed loop system which al-
lows the operation of specific valves by opening/closing them in a controlled manner through the manipula-
tion of oil pressure using an inverter-controlled pump. For control of the hydraulic pump and the solenoid
valves by inverter, programmable logic is used. The operational behaviours of the valves are configurable.
The system is enclosed in a cabinet which is a compound hydraulic/electrical system. Inside this cabinet
there is a pump with a small oil container and variable number of selector valves (2-6) as seen in section 4.
This unit can be controlled both locally and remotely. Local control relies on buttons located on electri-
cal cabinet door and a Human Machine Interface (HMI) that allows monitoring of valve position as well as
control and configuration of the system. For more information on how to control the system via HMI please
refer to section 5.2. Remote control can be enabled through various means:
· Modbus Holding Registers (HR)
- Through physical Modbus TCP connection
- Through VPN Modbus TCP connection
· Physical remote I/O
· PLC WebApp directly available via VPN connection
For more information on remote control options, please refer to section 8.

5.2. Valve control and position indication

A Local/Remote selector can be found on the side of the electrical control cabinet. This allows the user
to change the operational mode of the system. If "Local" is selected all remote operations are blocked, if
"Remote" is selected the system may be operated remotely. Disabling remote operation when in "Local"
operation is a critical safety feature for operating personnel.
Regardless of whether the user is controlling the system locally or remotely, there will be a "User Interface"
(UI) available to the user. While some aspects of the UI may be different in different control modes; the
manner of interaction will generally be the same. This section of the manual addresses only the general op-
eration of valves, for specific details on the usage of the HMI or remote operations please refer to sections
7 and 8 respectively.
Only one valve may be operated at a time, which is selected via an HMI screen that provides an interface
to the operator. Local control relies on buttons located on electrical cabinet door. There are common but-
tons for open, close and stop. Valve selection is usually achieved by clicking on the valve icon that the user
wishes to operate or by pressing the button associated to said valve, regardless of the UI used. The UI will
look similar to the image seen in Figure 3.
NOTE:
For simplicity, many other elements usually present in the UI were removed from
the following figure. The reader can get acquainted with these elements in the afore-
mentioned sections.
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