ALIND AN Series, User Manual

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USER GUIDE Page 10 of 16
ANC 303
ALUMINIUM INDUSTRIES LIMITED
Relays Division
PCB DESCRIPTION
The relay comprises of the following hardware.
Main PCBs. – Display PCB, Communication PCB, Controller PCB, Stack PCB, Trip relay
&transformer PCB, SMPS PCB,I/O& status PCB, Back panel PCB.
Display PCB :
The Display PCB is mounted at the front plate of the unit. It consists of the
20x4 LCD, LED indications, Keyboard circuits, and LED controller.
Controller PCB:
The Controller PCB is mounted on the back side of the Display PCB. This PCB
consists of major components such as DSP controllers, ADC and its filter circuits, Memory ICs,
RTC. The Analog signals are filtered and digitized in this board. The DSP takes decision based on
this digital samples and initiates necessary commands.
Communication PCB:
The communication PCB is mounted at the front side. This PCB
supports the communication through USB for data exchange. Also the Hardware Reset Switch is
mounted in this PCB.
Stack PCB:
Internal communications between the PCB’s are ensured with the help of stack
PCB.
Trip relay &Transformer PCB :
All the CTs, PTs and Tripping Relays are assembled in this
board. This board will give necessary trip commands to the master trip relay or breaker which is
installed in the yard. Necessary relay initiating signals are wired to these output relays from the
Controller Board.
SMPS PCB:
The SMPS PCB provides the necessary Power supply voltages to the different PCBs
mounted inside the relay. The SMPS is a DC-DC converter. The SMPS pr24V, +5V, -5V
and is5 V. The +24 V supply is used for the driving the output relays in the I/O PCB and
Trip Relay PCB. The +5V and -5V is supplied to the controller PCB, Display PCB, and I/O PCB for
normal operations. The is5V is dedicated to the communications ports of the relay.
I/O& status PCB :
The I/O PCB deals with the necessary I/O lines such as Input status lines
and Digital Output contacts. A separate controller provided in this board performs the necessary
I/O operations in conjunction with the DSP controller in the Processor PCB. The I/O PCB is
mounted vertically on to the stack PCB.
Back PCB:
This PCB consists of terminal blocks for external interface with the site and power
connector which connects SMPS, I/O and CT PT PCB’s. The RS 485 port is also mounted in this
PCB. The terminal block (TB-A) is having CT shorting facility. Since the rack with Terminal
Blocks is having the CT shorting facility, the relay can be withdrawn.