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The important fault indication device used in Air Compressor.
Posted Date: 01 Apr 2008 Resource Type: Articles/Knowledge Sharing Category: Education
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Posted By: prasanna Member Level: Gold
Rating:  Points: 2
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When your Air Compressor works smoothly every thing is so fine you even don't think about the problems which may occure in running condition.It is not
also possible to keep one operator near to air compressor for 24x7x365 days.In this condition it is very important to know the fault due to which compressor
is stopped.Ones you know the fault,you will rectify it within minimum time period.To indicate the fault which is occured in air compressor,a device called
"Solid State Annunciator" is fitted on control pannel.Now a days "Program logical control (PLC) is introduced to replace this device,but still many
compressor plants are in operation with solid state annunciator.
A solid state annunciator is provided to display audio visual alaram for number of safety devices fitted to the compressor & electric motor,through its
number of potential alaram points which legend on display windows,in centralised location.A common relay contactor in the annunciator actuates when
any of the window display the flasher.This relay contacts are incorporated to interlock with motor starter.
The Annunciator system consist of an integral power supply unit and a flasher unit common for all alaram points.One transistorised plug-in printed circuit
board per alaram point window.The legend on each window is designated after each safty device,connected in that respective channel.
In the event of failure of any system in the air compressor,the concerned safty device will operate.This causes the annunciator relay contactor to trip the
starter circuit.Instantaneously concern window will starts flashing & hooter blows.Thus you know the fault occured in compressor.
In that event,the hooter to be silenced by de-pressing "Accept" push-button,flashing lamp will remain steady.Remove the fault and press "Reset" push-button,the lamp will go off.Press "Test" push-button to see all window illuminates and restart the air compressor.
The solid state annunciator is designed as per the customers requirment,it is mandatory to go through the concerned schematic diagram before terminating
the safty devicess & interlock system.
This is some what old device for fault indication in compressor but due to simple in construction and operation,it is easily accepted by the Technicians.
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