The servo control module SVH61 is a device used to control the position of pneumatic or hydraulic servo valves in closed-loop control systems. It accepts an input signal of 4-20mA or 0-10VDC and is capable of receiving a 0-10V feedback signal from a linear variable differential transformer (LVDT). The control card can perform P (proportional) or P+I (proportional plus integral) adjustment in response to DEH (digital actuator) instructions and LVDT feedback voltage. Its output is a ±27mA current signal, using To drive the servo valve. It requires an externally provided +24V or -15V power supply and is wired on the corresponding input terminal.

The main features of the SVH61 servo control card include:

• - The S2 switch (DEH) allows the user to select current or voltage input, and zero and full scale can be adjusted separately.
• - The control card has a built-in LVDT modulator and demodulator, its amplitude is adjustable, the driving current is 50mA (in the range of 0-20mA), and it can output the valve position signal (50 ohm resistance).
• - The shutdown contact is allowed to be connected externally, and the proportional adjustment is adjustable, and the adjustment circuit is designed to be integrated.

This type of control card is commonly used in industrial automation, especially in applications that require precise control of the position and speed of fluid power systems. By providing accurate current output and accepting LVDT feedback, the SVH61 ensures system stability and accuracy.

The SVH61 servo control card is designed for the Digital Electro-Hydraulic (DEH) servo system of steam turbines. In the steam turbine control system, the DEH servo system is responsible for adjusting the nozzle and valve positions of the steam turbine to control the flow and pressure of steam, thereby managing the output power and operating efficiency of the steam turbine.

The SVH61 servo control card plays a key role in this system. It receives 4-20mA or 0-10VDC input signals from the control system (such as turbine control system) and performs precise closed loop based on the feedback signal from position sensors such as LVDT. control. Through P or P+I adjustment, SVH61 can ensure that the position of the servo valve accurately corresponds to the instructions of the control system, thereby achieving precise control of the turbine operating status.

Since steam turbine operation has extremely high requirements for safety and stability, the design of the SVH61 servo control card takes these factors into consideration, providing stable and reliable performance and flexible adjustment options to adapt to different control requirements and site conditions.
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