A DC speed controller is a device that regulates the speed of a DC motor. The upper end is connected to the AC power supply, and the lower end is connected to the DC motor. The DC speed controller converts the AC power into two output DC power supplies, one input to the excitation (stator) of the DC motor and the other input to the armature (rotor) of the DC motor. The DC speed controller adjusts the speed of the DC motor by controlling the DC voltage of the armature. At the same time, the DC motor provides a feedback current to the speed controller, which determines the speed of the DC motor based on the feedback current and adjusts the armature voltage output if necessary to adjust the motor speed again.

1. Check the armature carbon brush, the length, contact surface, and elasticity of the carbon brush are all suitable;

2. Check the reversing ring, the surface should be flat, without dents or damage, and the grooves should not be short circuited by carbon powder;

3. Check that there is no problem with the speed feedback component and the non load measuring coupling of the motor.

4. Check if there are any problems with the motor gearbox, such as oil leakage, poor lubrication, and worn transmission mechanism, which may cause unstable load and frequent adjustment of the governor.

If it is a simulated speed control system, it may be difficult for ordinary electrical maintenance personnel, but they still need to follow the following steps to handle it:

1. Measure whether the excitation provided by the speed controller to the motor meets the requirements of the motor and is stable. Generally, it should be constant to ensure the stability of the magnetic field, which is a favorable condition for constant speed;

2. Measure the armature voltage to determine its range of variation; (For a given value, it is generally around 40% * larger given value)

3. Measure the feedback voltage of the tachometer generator under the above conditions;

4. Measure the current of the motor under the above conditions;

5. Artificially increasing the motor load to observe changes in motor speed. If the load increases and the speed changes significantly, IMAX should be increased; If there is no significant change, proceed to the next step;

6. Adjust the feedback gain (increase or decrease to see if there is any change). If there is no change, return to the pre adjustment position and proceed to the next step;

7. Adjust the proportional gain and integral capacitance of the speed loop to stabilize the speed;

8. Reset the current loop parameters;

9. Test drive within the entire set range and perform fine tuning to maintain stable speed in all speed ranges and under any changes in load;

10. Production testing to confirm compliance with its process requirements. Complete the repair as required, if not, adjust the parameters as needed.
The altitude shall not exceed 2000 meters.
The ambient air temperature shall not exceed+40 ℃, not be lower than -5 ℃, and the average temperature within 24 hours shall not exceed+35 ℃.
The installation location has clean air, and the relative humidity of the atmosphere should not exceed 50% when the ambient temperature is 40 ℃. The average relative humidity in humid months is 90% when the average temperature is 25 ℃, taking into account the condensation that occurs on the surface of the product due to temperature changes.

Note: In order to facilitate the maintenance and updating of existing electrical equipment for users, a ZKS-3 thyristor DC speed controller has been specially designed to replace it
If you would like to learn more about the ZKS-3 thyristor DC speed controller, such as detailed product specifications, prices, maintenance and replacement, please contact us.