Reynolds inverter parameter settings

The use of Reynolds inverters in industrial production is very important, in addition to speed regulation, soft start effect, the important thing is to be able to save energy. There are many functional parameters of Reynolds inverter, and there are generally dozens or even hundreds of parameters for users to choose. In practice, it is not necessary to set and debug every parameter, and most of them only need to use the factory setting value. However, some parameters have a lot to do with the application of practice, and some are also related to each other, so they need to be set and debugged according to practice.

Reynolds inverter parameter settings

Due to the differences in the functions of various types of Reynolds inverters, and the titles of the same functional parameters are also inconsistent, but the basic parameters are simply available for all types of Reynolds inverters, which can be completely bypassed.

1. Reynolds inverter acceleration and deceleration time

1. Acceleration time: The acceleration time is the moment from its starting frequency to the operation frequency.

2. Deceleration time: It can set the time required from the operation frequency to the abortation of the motor.

The acceleration time is the time required for the output frequency to rise from 0 to the maximum frequency, and the deceleration time is the time required for the output frequency to drop from the large frequency to 0. Generally, the acceleration and deceleration time is confirmed by the rise and fall of the frequency setting signal. When the motor is accelerating, the frequency must be set to rise rate to avoid overcurrent, and when decelerating, the rate should be reduced to avoid overvoltage.

Speed up the time setting requirements: the acceleration current will be below the overcurrent capacity of the inverter, so that the over-speed loss will not cause the inverter to trip; The key points of the deceleration time setting are: to avoid excessive voltage of the lubricating circuit, and not to cause the regenerative overvoltage stall and trip the inverter. The acceleration and deceleration time can be calculated according to the load, but in the debugging, it is often used to set a longer acceleration and deceleration time according to the load and experience, and observe whether there is an overcurrent and overvoltage alarm after starting and stopping the motor; Then the acceleration and deceleration setting time is gradually shortened, and the optimal acceleration and deceleration time can be confirmed by repeating the operation several times in the principle that no alarm is generated during the operation.

2. Reynolds inverter motor parameter setting

The parameters can be set in the inverter according to the additional voltage and additional current using the motor nameplate.

1. Work direction: mainly used to set whether to prohibit rotation.

2. Shutdown mode: used to set whether the brake is stopped or free.

3. Upper and lower voltage limits: set the limit according to the voltage of the equipment motor to avoid burning out the motor.

3. The torque of Reynolds inverter is increased

Also known as torque compensation, it is a method to increase the low-frequency scale f/V in order to compensate for the decrease in torque at low speed caused by the resistance of the stator winding of the motor. When set to active, the voltage at the time of acceleration can be actively increased to compensate for the starting torque, so that the motor can be accelerated smoothly. If manual compensation is selected, the best curve can be selected according to the load characteristics, especially the starting characteristics of the load. For variable torque loads, if the selection is not appropriate, the output voltage at low speed will be too high, and the phenomenon of wasting electric energy will be presented, and even the phenomenon that the current is large when the motor is started with load, and the speed cannot go up.

Fourth, the frequency of Reynolds inverter sets the signal gain

This function is only useful when setting the frequency with an external analog signal. It is used to compensate for the inconsistency between the externally set signal voltage and the internal voltage (+10V) in the inverter; When setting, when the simulated input signal is large (such as 10V, 5V or 20mA), the frequency percentage that can output F/V graphics can be calculated and set with this as a parameter; If the external setting signal is 0-5V, if the output frequency of the inverter is 0-50Hz, the gain signal can be set to 200%.

5. Reynolds inverter torque

It can be divided into two types: driving torque and braking torque. It is based on the output voltage and current values of the inverter, and the torque is calculated by the CPU, which can significantly improve the shock load recovery characteristics during acceleration and deceleration and constant speed operation. The torque function enables active acceleration and deceleration control. Assuming that the acceleration and deceleration time is less than the load inertia time, the motor can also be ensured to actively accelerate and decelerate according to the torque set value.

The drive torque function provides a strong starting torque, in the steady-state operation, the torque function will control the motor to deteriorate, and the motor torque within a large set value, when the load torque suddenly increases, or even when the acceleration time is set too short, it will not cause the inverter to trip. When the acceleration time is set too short, the motor torque will not exceed the large set value. A large drive torque is beneficial to the start, so it is more appropriate to set it to 80-100%.

The smaller the braking torque setting value, the greater the braking force, which is suitable for the occasion of rapid acceleration and deceleration, such as the overvoltage alarm phenomenon when the braking torque setting value is set too much. If the braking torque is set to 0%, the total amount of regeneration added to the main capacitor can be close to 0, and then the motor can be decelerated to a stop without using a braking resistor when decelerating. However, on some loads, such as when the braking torque is set to 0%, the phenomenon of short time and idling will be presented when decelerating, resulting in repeated start of the inverter, and the current will fluctuate greatly, and the inverter will trip when it is severe, which should be noted.

Sixth, Reynolds inverter acceleration and deceleration form selection

Also known as acceleration and deceleration curve picking. Generally, there are three kinds of curves: linear, nonlinear and S, and most of them choose linear curves; The nonlinear curve is suitable for variable torque loads, such as fans, etc.; The S-curve is suitable for constant torque loads, where the acceleration and deceleration change slowly. When setting, you can select the corresponding curve according to the load torque characteristics, but there are exceptions, when the author debugs the inverter of a boiler induced draft fan, first select the nonlinear curve of the acceleration and deceleration curve, and the inverter trips when it is operated together, and the adjustment and change of many parameters has no effect, and then it is normal after changing to the S curve. The reason is: the induced draft fan before starting rolls by itself because of the flue gas activity, and rotates and becomes a negative load, so that the S curve is selected, so that the frequency rise speed when just starting is slower, and then the inverter tripping is avoided, of course, this is the method selected for the inverter without starting DC braking function.

7. Reynolds inverter electronic thermal overload maintenance

This function is set to maintain the overheating of the motor, which is that the CPU in the inverter calculates the temperature rise of the motor according to the operating current value and frequency, and then carries out overheating maintenance. This function is only applicable to the occasion of "one to one", and in the case of "one to many", thermal relays should be installed on each motor. Electronic thermal maintenance setpoint (%) = [motor additional current (A) / inverter additional output current (A)] × 100%.

8. Reynolds inverter frequency

That is, the upper and lower amplitudes of the output frequency of the inverter. Frequency is a maintenance function to avoid misoperation or failure of the external frequency setting signal source, which causes the output frequency to be too high or too low, so as to prevent damage to the equipment. In operation, it can be set according to the practical situation. This function can also be used for speed limiting, such as belt conveyor, because the conveying material is not too much, in order to reduce the wear of machinery and belt, you can choose to use the inverter to drive, and the upper limit frequency of the inverter is set to a certain frequency value, so that the belt conveyor can operate at a fixed, lower operating speed.

1. Panel speed regulation: It can adjust the frequency through the buttons of the panel.

2. Sensor control: The frequency can be controlled by the voltage or current change of the sensor as a signal input.

3. Communication input: control its frequency with PLC and other host computers.

Reynolds inverter parameter settings

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