Automatic reversing PLC control plating coating power supply
Automatic commutation type The origin of electroplated coating power supply controlled by programmable logic controller (PLC): In order to meet the user's functions of voltage regulation, steady current and stable current density for power supply equipment, power supply equipment is easy to operate, reliable in operation and high in automation. Designed to produce the requirements. Compared with the traditional commutated electroplating coating power supply, this power supply uses more advanced technology, higher reliability, more complete control functions, and more convenient adjustment of process parameters. This article describes the control principles and functions of the power supply.
The main circuit connection of the electroplated coating power supply:
The requirements of the electroplating process are as follows: the output voltage of the power supply is 6~48V, and the current can be from tens of amps to tens of thousands of amps. For this low voltage and high current, the power supply of the automatic commutation is required. The main circuit principle is shown in the figure below.
Schematic
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The main circuit uses two sets of anti-parallel thyristor rectifiers, sharing a rectifier transformer with a double-reverse star balance reactor, which is beneficial to the improvement of power efficiency and the cost of the equipment.
Control system
The diagram above shows the composition of the power control system. The following is a detailed description of the components.
1. Signal conversion and fault protection unit: including signal transformation and signal detection, the current feedback signal is obtained from the transformer or the shunt, the voltage feedback signal is obtained from the output of the rectifier, and the current density is detected by the substrate in the plating solution. Meter unit area current intensity. Each feedback signal is amplified and isolated by a signal conversion board.
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Relay control and pulse logic switching unit:
The pulse logic switching unit takes PLC as the core. During the running process, the LCD screen displays the running time of each working segment in real time, through the internal program for relay interlocking, the starting and stopping signals of the power supply device and the fault integrated signal are connected, reducing The peripheral components and external wiring of the device improve the automation and reliability of the entire system.
Trigger adjustment unit:
The trigger circuit of the digital trigger is controlled by the counting pulse phase shifting, and the counting pulse can be triggered by counting 512. The digital or analog given voltage signal is integrated with the feedback signal outputted by the signal conversion board through the soft start link at the input end of the regulator. When the current (or voltage, current density) of the DC output changes due to grid fluctuation or load fluctuation, the Uk of the regulator output changes, triggering the phase shift of the pulse, so that the output value is stable within the allowable range of the set value.
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Technical and structural characteristics of the electroplated coating power supply:
Operational data feedback, various technical indicators meet or exceed the relevant provisions of JB/T1504-93 industry standard "Rectification equipment for electroplating". The main technical indicators of the equipment are as follows:
(1) rated DC output current Idn: 100 ~ 10000A
(2) Stability error of current density: no more than ± 5%
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(3) Allowable load value: Continuous operation at a level I load of 67% or more of the rated voltage. When the equipment is operated below 67% of the rated voltage, the load capacity is decremented.
(4) Voltage regulation accuracy: better than ± 0.5%
(5) Rated output DC voltage Udn: ±6, ±9, ±12, ±18, ±24, ±36, ±48V
(6) Steady flow accuracy: better than ±1%
(7) Pressure regulation range: 0~Udn
Keywords: electroplating power supply, coating power supply, PLC power supply, automatic commutation power supply Related power supply equipment: power supply