METSO IOP114 DC input card

The results may be worse if we turn the faucet too fast. The overreaction results in temperature oscillations. When the response of the system oscillates, we say that the system is unstable. Clearly, unstable responses are bad when we want a constant level. What causes the oscillations? The basic cause for the instability is a combination of delayed reaction and high gain. In the case of the temperature control, the delay is due to the water flowing in the pipes. When the human reaction is too strong, the response becomes unstable. Servo systems also become unstable if their gain is too high. The delay in servo systems is between the application of the current and its effect on the position. Note that the current must be applied long enough to cause a significant effect on the velocity, and the velocity change must last long enough to cause a position change. This delay, when coupled with high gain, causes instability.

This motion controller includes a special filter

 which is designed to help the stability and accuracy. Typically, such a filter produces, in addition to the proportional gain, damping and integrator. The combination of the three functions is referred to as a PID filter. The filter parameters are represented by the three constants KP, KI and KD, which correspond to the proportional, integral and derivative term respectively. The damping element of the filter acts as a predictor, thereby reducing the delay associated with the motor response. The integrator function, represented by the parameter KI, improves the system accuracy. With the KI parameter, the motor does not stop until it reaches the desired position exactly, regardless of the level of friction or opposing torque.

The integrator also reduces the system stability.

 Therefore, it can be used only when the loop is stable and has a high gain. The output of the filter is applied to a digital-to-analog converter (DAC). The resulting output signal in the range between +10 and -10 Volts is then applied to the amplifier and the motor. The motor position, whether rotary or linear is measured by a sensor. The resulting signal, called position feedback, is returned to the controller for closing the loop. The following section describes the operation in a detailed mathematical form, including modeling, analysis and design.The elements of a servo system include the motor, driver, encoder and the controller. These elements are shown in Fig. 10.4. The mathematical model of the various components is given below.

Common problem

We have this product in stock, and we can deliver it to you at any time when you need it badly.

*The warranty period of all products is 1 year, which has passed the professional test certification.

*If you need to order more than one product, please contact us, and we can offer you a discount.

*We only use HDL  UPS  and other express delivery methods to deliver spare parts.

*If you find that other suppliers offer lower prices for the same products, we are also willing to offer you further discounts based on their prices.

If you have any other questions, please feel free to contact us via email.

*Please let us know if you need any spare parts, we can give you further assistance, and we are waiting for your inquiry.