Tongxiang Yiwei Automation Technology Co., Ltd. hourly service hotline: -
Siemens DC speed regulator repair
(Siemens) DC speed regulator is a motor speed control device including motor DC speed regulator, pulse width DC speed regulators, thyristor DC speed regulators, etc. are generally modular DC motor speed regulators that integrate power supply, control, and drive circuits. They adopt a three-dimensional structure layout. The control circuit uses micropower components and photoelectric couplers to realize current and voltage. The proportional constant, integral constant and differential constant of the isolation conversion circuit are adjusted with the D adapter. It has the characteristics of small size and light weight. It can be used alone or directly installed on a DC motor to form an integrated DC speed regulating motor, which can have all the functions of a speed regulator.
DC speed regulator is a device that adjusts the speed of DC motors. Since DC motors have the characteristics of low speed and high torque, which cannot be replaced by AC motors, DC speed regulators, which are devices for adjusting the speed of DC motors, have broad applications.
The following occasions require the use of DC speed regulators:
,
A wider speed regulation range is required
,
A faster dynamic response process is required
,
An automatic smooth transition process is required during acceleration and deceleration
,
It requires better excavator characteristics to automatically limit the overload current to the set current.
,
It requires better excavator characteristics to automatically limit the overload current to the set current.
The above five points are also the application characteristics of DC speed regulator.
CNC machine tools, paper printing, textile printing and dyeing, optical cable equipment,
Packaging machinery, electrical machinery, food processing machinery, rubber machinery, biological equipment, printed circuit board equipment, experimental equipment, welding and cutting , light industrial machinery, logistics and transportation equipment, rolling stock, medical equipment, communication equipment, radar equipment, satellite ground receiving systems
Working principle
DC speed regulator is a device that regulates the speed of DC motors. The upper end is connected to the AC power supply. The lower end is connected to the DC motor and the DC speed regulator converts the AC power into two output DC power supplies. One input is to the DC motor excitation (stator) and the other is input to the DC motor armature (rotor). The DC speed regulator controls the armature DC voltage to control the fishing tackle and DC power. Motor speed. At the same time, the DC motor gives a feedback current to the speed regulator. The speed regulator determines the speed of the DC motor based on the feedback current, and if necessary, corrects the armature voltage output once to adjust the motor speed again.
Check that the length of the armature carbon brush, the contact surface and elasticity are appropriate
Check that the commutation surface should be flat, without dents, no damage, the grooves are not short-circuited by carbon powder
Check the speed measurement feedback components There is no problem with the coupling measured with the motor without load.
Check whether there is any problem with the motor gearbox, oil leakage or poor lubrication. The wear of the transmission mechanism may cause the load to be unstable and cause the speed regulator to adjust frequently.
If it is an analog speed control system, it will be more difficult for ordinary electrical maintenance personnel, but they still need to follow the following steps:
,
Whether the excitation provided to the motor by the side-leaving speed regulator meets the requirements of the motor requirements and stability. Generally, it should be constant to ensure the stability of the magnetic field, which is an advantageous condition for constant speed
,
Measure the armature voltage to determine its variation range (for a given value, it can generally take about % of the maximum given value)
,
Measure the feedback voltage of the tachogenerator under the above conditions
,
Measure the current of the motor under the above conditions
,
Consider it to increase the motor load Observe the changes in motor speed. If the load increases and the speed changes significantly, increase the speed. If there is no obvious change, go to the next step
,
Adjust the feedback gain (increase or decrease to see if there is a change). If there is no change, return to adjustment. Enter the next step at the previous position
,
Adjust the speed loop proportional gain integral capacitor to stabilize the speed
,
Reset the current loop parameters
,
In all The set range test run is fine-tuned to maintain speed stability under any change in load in all speed sections
, and the production test run is performed to confirm that the process requirements are met. Complete repairs that meet requirements and adjust parameters if necessary.
Common faults of Siemens speed regulator
Unstable speed, no output, low output voltage, low burning, thyristor, no excitation voltage, burning fuse, no display, tripping
Excitation fault
Under voltage fault
Overvoltage fault
Incoming power frequency fault
Telegraph fault
Telegraph fault
Telegraph fault
Pulse blocking due to excessive armature current
Speed regulator monitoring
Overspeed
Fault activation
Tachometer failure
Simulation settable input failure
Encoder failure
Optimization failed
Optimization interrupted
Internal memory failure
Failure, no display, incomplete characters, unstable speed, burning thyristor alarm, etc. For more failures, please read the manual
Installation method
,
Desktop DC speed regulator : Directly placed on the plane of the fixed table machine casing.
,
Panel-mounted DC speed regulator: Generally embedded in the distribution cabinet, the surface of the distribution box equipment needs to be drilled and must meet the size requirements of the speed regulator itself.
,
Wall-mounted DC speed regulator: directly installed inside the body of the distribution cabinet, distribution box, equipment, etc. It is a relatively convenient installation structure.
,
Integrated DC speed regulator: The motor and speed regulator are integrated.
Head office address: Science and Technology Entrepreneurship Center Building, Development Avenue, Tongxiang City, Zhejiang Province
Suzhou Technology Center Address: Gangtian Road, Industrial Park, Suzhou City, Jiangsu Province
Contact number: - Contact person: Mr. Chen
Fax:
Email: d@-r.
Siemens DC speed regulator repair