SVA-III-M Servo Amplifier

Description
SVA-III-M servo amplifier is a SVA-III board type amplifier, which integrated with standard 19-inch power chassis. Its controlling functions are same with that of SVA-III board type amplifier. Electro hydraulic servo drive is mainly for controlling 3-stage valve with LVDT position sensor, which can realize closed-loop controlling within the inner loop of the servo valve's coil. By setting of jumping switch, it can also be used for controlling closed loop of position formed by a 2-stage servo valve and LVDT sensor.

Technical Features
1. Three-stage servo valve closed loop control with LVDT position sensor
2. Setting and selecting outer loop PID is control by a jumping switch
3. Limiting of output current
4. Adjustable inner loop gain
5. Easy and quick front-board testing and adjusting potentiometer
6. Straightforward valve coil current and power supply indication

Structure Characters
1. It has a LVDT demodulator circuit, with the function of PID controlling of outer loop.
2. Electro hydraulic servo drive is furnished with an integrated linear power supply. You can supply AC220V directly.
3. The outline uses a standard casing.
4. The front board ammeter indicates the valve's coil current for easy observation in commissioning.

Application
SVA series servo amplifiers are specially used for driving and controlling electro-hydraulic servo valves. The amplifiers are mainly for high accuracy controlling of electro-hydraulic servo valves like nozzle flapper servo valves, and jet pipe servo valves, etc. In a hydraulic system, it is possible to control physical parameters, like position, speed, acceleration and force by using various hydraulic devices and measuring sensors. For example: Valve-controlled cylinder, valve controlled motor, valve-controlled pumps, etc.

Parameters of Electro Hydraulic Servo Drive

Power supply		V	AC220
Servo amplifier	Analogue input		±10V, 0-10V, 4-20mA
	Servo valve driving capacity		±100mA, 100Ω
	Prorortional gain	mA/V	5 to 300
	Integration gain	mA/V-sec	8 to 4000
	Differential gain	mA/V-sec/v	0.04 to 4
	Inner loop gain	mA/V	10 to 200
	Disturbance signal		200 Hz 5Vpp
Oscillator	Frequency	Hz	100 to 2500
	Amplitude	Vpp	2 to 11
Demodulator	Ripple	mVp-p	<40(within given excitation frequency)
	Gain	Vdc/Vp-p	1 to 10
Operation range		℃	0 to 50
Outline size		mm	100 × 160