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PROVOX regulator valve described positive and negative effects
A control circuit used in positive and negative regulator of the role of self-control professionals is common sense, this is nothing new here. However, Fisher-Rosemount s PROV () XDCS concept used in the product unique. It must be clear differences, it may be formed on the right of the DCS control loop. The core concept is the introduction of an IVP (ImpliedValvePosition) implies that the concept of valve position. With this. IVP concept, replacing the traditional concept of controller output signal, and thus its role in the concept of positive and negative regulator is different. The significance of this IVP is always on behalf of the controller output signal of the control valve command value of the opening, but it is not a true valve position transmitter measured by the valve opening, but the controller output signal to the regulating valve, the valve should open value. Therefore, it is called the implied (Implied) valve.
Understand this concept IVP, both positive and negative role of the regulator is not difficult to understand a new concept. This positive effect is that when the regulator deviations (positive, negative set) increases, the requirements of the command of the regulator valve opening also increased; the other hand, when the regulator error increases, and require the The command of the regulator valve opening decreases, was counterproductive. By this definition, the concept of the traditional concept than the original idea of ??simple and more clear. Regulator control loop to determine the positive and negative effects is very easy and fast.
The concept of the prominent features, that is, to determine the loop regulator positive and negative role, the used valve to “enhance the open” (FC, used to refer to gas-open) and “increase off” (FO, used to refer to gas-off style) performance to set aside, making it simple ideas. Of course, the actual control process, the control valve is not allowed FC and FO performance aside, it is a complex problem into two simple questions to deal with. Here, the control valve performance FC and FO regulator itself as a parameter to deal with that configuration in the regulator, the regulator must be filled by the command of the control valve is “to increase open” or “add on” ( FC or FO-based) content. Regulator that this FC or FO information, on the signal processing carried out in-house – is the reverse of the FO, the FC does not reverse. This guarantees that the control valve command signal sent to the correctness, but also to ensure that the operator sees on the screen of the IVP regulator on behalf of its command signal is always proper valve opening – 1009,6 valve fully open , O% valve is fully closed. So that the operator does not have to remember each control valve FC and FO, so that self-control personnel from the composition of the control loop can easily determine the role of positive and negative regulators.
This concept, only the command for a control valve (or output signal is sent to a follow-up unit – regulator, auxiliary units, etc.) of the control system s advantages are obvious; and for a regulator valve command when more than one may cause some trouble, will occur two (several) control valve FC or FO inconsistent, or two (several) valve on the regulator s role in positive and negative requirements are inconsistent and so on. For similar problems, the first must ensure that the correct control function; 2 FC regulating valve and the regulator with the FO s positive and negative effects, to be based on the characteristics of the control loop, the operator s operating practices, subject to one of the control valve , fill in the configuration of the positive and negative regulator role and control valve FC and FO content. While the other valve, although the regulator configuration can not meet the FC and FO and supporting positive and negative effects, but must use other methods to meet the correctness of its control. PROVOX system has many features to meet this requirement. If difficult, you can also point the FST by I. CP programming functions to achieve.
Adjust the regulator on tractor technology
1, the closure device adjustments. First, adjust the contact gap of 0.7 when separated – 0.9 mm. Remove the regulator terminal on the battery and the wire armature, and then firing at the armature terminal on the battery touch the fire, use battery power to absorb the activities of rallying action interceptors. In the touch of fire, relax interceptors spring, so that the magnetization of the core activities of rallying will suck, and then tighten the spring while hitting the edge of the fire until it just can not suck up to the next rallying, indicating that the closure spring is suitable for 12V voltage, then empirically adjusted spring, closed slightly higher voltage. Closed voltage adjust, it will remove the battery, the armature wiring connected, start the engine test. Idle micro-ammeter pointer offset to the discharge direction, and then improve the speed of the current pointer to the direction of charge, when the slow speed to a lower value, the ammeter pointer back to zero discharge and speed, the ammeter pointer when the maximum value of reverse swing is the counter-current value, its value should meet the requirements.
2, the limiter adjustment. Discharge the battery in a semi-state (if sufficient save electricity, electric starter can start the generator 2 – 3 times), stuffed with a wood core and booster activities rallying between the regulator contacts are closed , loss of regulator role. Then the engine speed increases to medium speed, then the current value of the ammeter pointer to the specified value should be 3 / 4. To continue to increase speed, while the ammeter indicates the current value is no longer increasing, and the limiter contacts between the weak spark, should be considered normal.
3, the regulator adjustment. Stuffed with wood chips in the current limiter and the core activities of rallying between the limiter contact closure, the generator running at medium speed, change the spring tension and adjust the generator terminal voltage. If more battery power loss, the ammeter indicates at 12A or so (loss of electricity charge value). If the battery charge than the full, the ammeter indicates 8A or so, the generator terminal voltage close to the standard value.