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简单介绍美国VICKERS比例放大器
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through the valve that exceeds levels traditionally experienced with on-off solenoid valves.
Smooth speed change transitions are obtained as compared to the high shock with on-off solenoid valves.
A single proportional solenoid valve can replace several conventional valves in a control system. Deceleration valve,
acceleration valve, flow controls and solenoid switching valve functions are all packaged in one proportional valve envelope.
Smaller manifolds and fewer hydraulic interconnecting lines are needed.
Remote electric, programmable signals to the amplifier controls all of the above functions.
A typical circuit for a single stage feedback type valve in an open (outer) loop application is shown in Figure 1.
The basic procedure is a top-down approach. See Figure 2.
The top section on the front face of the amplifier has several indicating lights (LED’s).
They indicate when the 24V power is on; if command control voltage is working; if the enable switch is closed;
if there is an overload caused by improper wiring; a short condition internal or external of the amplifier that results in over current;
or if there is current to a solenoid. In the latter case, the light brightens with increased current.
Though set-up is from the top, down, it is best to explain gain control first.
Gain adjustments are the lower two pots in the second box from the top, on the front face of the amplifier.
This current is usually regulated by varying the command voltage into the amplifier.
The greater the current to the solenoid coil, the greater will be the valve spool
displacement (travel) and oil flow through the valve.
By controlling the rate of current increase or decrease,
EEA-PAM-561-A-30 KFDG5V-5/7
EEA-PAM-568-A-30 KFDG5V-8
This document describes how to set up the Vickers 30 design proportional valve power amplifiers.
The Eurocard type amplifiers covered in this procedure are listed below.
More detailed information on the power amplifiers can be found in Vickers catalog GB-C-2007C.
AMPLIFIER VALVE
EEA-PAM-523/525-A-30 K*G4V-3/5 Non-feedback valves
EEA-PAM-533/535-A-30 KFG4V-3/5
A 24VDC power supply is connected to pins bdz32 (+) and bdz30 (–).
An enable switch connected between bdz32 and pin z2a is required.
The valve is connected according to the circuit diagram. A (+) or (–) 10V at 5mA reference is provided for command voltage control.
When wired as shown in the diagram, the control pots should be 2000 ohms or greater.
If the pot is to be connected across the (+) or (–) pins z2 and b2,
the minimum pot size should be 4000 ohms.
or deceleration control of the hydraulic actuator and its working load.
This document does not deal with valve sizing. However,
it should be recognized that proper sizing will directly affect the control of acceleration and deceleration.
Select the smallest valve size possible and the smallest spool size within that valve size.
This results in pressure drop
EEA-PAM-581-A-30 KHDG5V-5/7/8
This procedure may also be applied to the EEA-PAM-5**-C-30 and partially to the EEA-PAM-5**-B-30.
Refer to Vickers catalog GB-C-2007C for more detailed information on these power amplifiers.
This is an easy-to-use procedure for anyone with a little understanding of how proportional valves work.
Proportional valve solenoids are current controlled.
the spool displacement or valve opening rate will increase or decrease resulting in acceleration
简单介绍美国VICKERS比例放大器
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