Electronics Circuit Boards; Main Control Board; Display Board; Power Supply Unit - Amtech Axpert-Eazy Series Instruction Manual

CHAPTER-7: ELECTRONICS CIRCUIT BOARDS
Axpert-Eazy Series AC AC DRIVE has following electronics circuit boards.

7-1 Main Control Board

The Control Board PCA-2014A is a multipurpose board and specifically designed to meet the high-
end performance of the power electronics products like AC DRIVE, Front-end converter, PWM DC
Drive etc...
It uses 32-bit High-Performance Digital Signal Processor TMS320F2811. The control board
generates the necessary pwm control signals for AC DRIVE operation. It accepts various inputs from
different circuits, gate drive board and Digital Operation Panel (LCD Keypad Module) to generate the
necessary control and gate signals.
The TMS320F2811 (U1) is the heart of this board. It handles the user interfaces and core algorithm
and generates IGBT gate signals. The PCA-2014A is connected to PCA-2012 Display Card with RS-
485 link. PCA-2012 display various parameters of the drive.

7-2 Display Board

The unit is equipped with Digital Operation Panel (LCD Keypad Module) for the user interface. All
parameters of drives can be accessed from Digital Operation Panel. The Digital Operation Panel
consists of Display Board PCA-2012 and 8-keys. The display board uses 20x4 Liquid Crystal Display
(LCD).
It has LPC2368 ARM micro-controller. When interfaced with main control board PCA-2014A, this
becomes master and the main control boards works as slave. The master and slave communication is
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based on RS-485 (Modbus-RTU Protocol).

7-3 Power Supply Unit

For 400V series
PCA-92A is used as Power Supply Unit. This unit provides the power to all boards in the drive. The
input to the power supply board is 350~800Vdc. The different outputs of the power supply board are
+15V/2.2A, -15V/0.5A, +5V/1A and +24V/0.5A.
For 500V and 600V series
PCA-125A is used as Power Supply Unit. This unit provides the power to all boards in the drive. The
input to the power supply board is 400~1200Vdc. The different outputs of the power supply board are
+15V/2.2A, -15V/0.5A, +5V/1A and +24V/0.5A.

7-4 IGBT Gate Driver Boards

PCA-1024 or PCA-1018A or PCA1029 are used for IGBT gate driving circuit. This is used to drive the
IGBT switches. Depending on the AC DRIVE size, different driver boards are used. It requires +15V
power supply. Main control board PCA-2014A provides the input gate pulse via wire interface or fiber
optic cable. In case of fault, it transmits the same to the main control board.
7-5 MOV, RC Snubber, SC & Bleeder Board
This is snubber board for the input diode. PCA-91 is a combination of R and C connected across the
dc bus. This board also includes Soft charge resister and MOV network to protect the unit against the
surge / voltage transients coming in the power lines. This is used up to AMT-055-4 rating.

7-6 Bleeder Board

For 400V series
PCA-83/85/86 Bleeder board equalizes the dc bus voltage across the series capacitors.
For 500V and 600V series
Axpert-Eazy AC Variable Frequency Drive
7.1