Gilderflukeco old EFB Controllers Manuel d'utilisateur télécharger pdf (Page 3)

The cylinder can be virtually any type of double acting cylinder available (rotary, linear, etc.). The

stroke and diameter of the cylinder can be used to determine the size of valve you need to use by

calculating the approximate displacement of the cylinder and comparing it to the cubic feet per minute

(CFM) capacity of the valve.

A number of different styles of position transducers are available. These include standard linear and

rotary potentiometers as well as 'string pots' in which a small steel cable extends to measure distances.

Whatever type of transducer is used, it must be linked to the actuator so that it closely follows the

movement and uses as much of it's 10 Kohm stroke as possible. For any permanent installation you must

use a potentiometer which is made for this type of heavy duty use. Typical life span ratings are in the 2

to 20 million cycle range.

The output which goes to the valve is +/- 10 volts at a current up to 20 ma. This is compatible with

the 250 ohm coils on most servo valves. If air use is a factor in your design, you should use a two stage

valve (like the Atchley 204-PN) in that there quiescent air consumption is lower than a single stage valve

(like the Atchley (200-PN).

Controls:

There are three adjustments available on each of the four EFB circuits. These are:

1) Gain. This controls how much the valve will be opened for a given movement. This control is

bypassed when there is an error condition in the feedback transducer wiring or on power-up.

Turning it counter-clockwise lowers the gain.

2) Velocity. This control limits the maximum amount the valve may open by adding a resistance in

series with the valve. Turning this control counter-clockwise lowers it's effect.

3) Low Gain. This control serves the same function as the normal gain control, but only at the times

when there is an error condition in the transducer wiring or when the EFB controller has just been

powered up. At all other times this control is bypassed. You can use this control to set the speed

at which the movement will go when power is first applied to a circuit or there is a problem in

the transducer wiring. Turning this control counter-clockwise lowers the gain.

Adjustment:

Adjusting an EFB movement is part skill and part art. Unfortunately it must be done to taste, so there

are no set rules about making these adjustments. The following procedure will usually yield satisfactory

results

1) When you first turn on a EFB circuit to start testing it, you should first turn the gain controls all the

way down (counter-clockwise) and the velocity control all the way out (counter-clockwise).

2) Turn the gain control clockwise as you apply a varying command voltage to the movement to

sweep it back and forth. As the gain comes up, you will start to see the valve indicator LEDs start

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If this is the first time the circuit has been turned on, you may find that the movement turns the

valve on hard in one direction and just wants to stay there. This means that there is something crossed in

the EFB's hookup. To correct this problem you will need to reverse the connections at one and only one

of the following points:

1) Switch the wiring on the transducer. One of the two wires to the transducer is attached to the

wiper. Leave this one alone. The other wire is attached to one end of the resistor. Move this wire

to the opposite end of the resistor (this would be the connection marked 'N/C' on the

illustration).

2) Switch the two wires on the valve. If the valve is opening in the wrong direction, reversing the

two wires to the valve will reverse the direction the valve opens.

3) Switch the plumbing between the valve and the cylinder. Just cross the two hoses at either the

valve or cylinder end of the hookup.

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Gilderflukeco old EFB Controllers Manuel d'utilisateur Page 3

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