Unit 32 DIP 2-IT

The features of electrical circuits which use to describe the current, voltage and resistance

The electrical circuit types are Series, parallel and parallel-Series circuits. The components in a circuit are joined by wires.

• Circuit characteristics

• Circuit isolation procedures

  Common electrical test instruments and their application

• Errors indicated by built-in devices

• Common electrical test instruments and their application

Detecting faults and errors (open and short circuit faults) in the electrical circuit by using built in devices like current sensor, voltage sensor. Power sensor

• Errors indicated by built-in devices

• Circuit characteristics

• Common electrical test instruments and their application

• Circuit isolation procedures

Electrical equipment can be isolated using opt-couplers, isolating transformers or any other device which isolates two electrical circuits from one another. Electrical isolation is required to prevent damage to either electrical circuit when one of them is under fault conditions.

·       Site Safety Management

·       Identify the circuit to be isolated and ensure that the correct point of isolation is identified

·       Switch the circuit breaker or isolator

·       Caution Notices

·       Proving Dead Isolated Equipment or Circuits (using multimeter)

• Circuit isolation procedures

• Errors indicated by built-in devices

• Circuit characteristics

• Common electrical test instruments and their application

Test equipment is necessary for determining proper set-up, adjustment, operation, and maintenance of electrical systems

• Ammeter (Ampermeter): Measures current

• Capacitance meter: Measures the capacitance of a component

• Cos Phi Meter: Measures the power factor

• Distortionmeter: Measures the distortion added to a circuit

• Electricity meter: Measures the amount of energy dissipated

• ESR meter: Measures the equivalent series resistance of capacitors

• Frequency counter: Measures the frequency of the current

• Leakage tester: Measures leakage across the plates of a capacitor

• LCR meter: Measures the inductance, capacitance and resistance of a component

• Multimeter: General purpose instrument measures voltage, current and resistance (and sometimes other quantities as well)

• Ohmmeter: Measures the resistance of a component

• Oscilloscope: Displays waveform of a signal, allows measurement of frequency, timing, peak excursion, offset, ...

• Transistor tester: Tests transistors

• Wattmeter: Measures the power

• Voltmeter: Measures the potential difference between two points in a circuit.

• Common electrical test instruments and their application

• Diagnostic skills for identifying faulty circuit operation

• Common techniques for testing electrical circuits

• Requirements for recording and reporting electrical circuit faults and rectifications

   

Methods used for testing the electrical circuit faults:

Visual: burnt out components, signs of overheating, and missing components can be found easily through a thorough visual inspection.

Physical: By touching the surface of the electrical circuits

Discrete Component Testing

Calculations to determine the accurate amount of power, voltage, Resistance and current

• Common techniques for testing electrical circuits

• Circuit isolation procedures

• Common electrical test instruments and their application

• Errors indicated by built-in devices

5 Step Troubleshooting Approach consists of the following steps:

Step 1 Observation

Step 2 Define Problem Area

Step 3 Identify Possible Causes

Step 4 Determine Most Probable Cause

Step 5 Test and Repair

Follow-up

• Diagnostic skills for identifying faulty circuit operation

• Requirements for recording and reporting electrical circuit faults and rectifications

   

   

• appropriate techniques and procedures for returning the circuit to specification

• Site and manufacturer’s circuit specifications

Tools and documents for keeping record and follow-up electrical circuits fault and maintaining.

Technicians need to gather information regarding the equipment and the problem. They should understand how the equipment is designed to operate. It is much easier to analyze faulty operation when know how it should operate. Operation or equipment manuals and drawings are great sources of information and are helpful to have available. If there are equipment history records, Technicians should review them to see if there are any recurring problems. They should also have on-hand any documentation describing the problem. (i.e., a work order, trouble report, or even your notes taken from a discussion with appropriate person)

• Requirements for recording and reporting electrical circuit faults and rectifications

• Appropriate techniques and procedures for returning the circuit to specification

• Any applicable industry standards, national standards, national occupational health and safety commission and regulatory requirements

• Site and manufacturer’s circuit specifications

The process of circuit design begins with the specification, which states the functionality that the finished design must provide, but does not indicate how it is to be achieved. As the repair procedure some time technician will frequently return to the specification and alter it to take account of the progress of the design if need or troubleshoot implemented changes

• Appropriate techniques and procedures for returning the circuit to specification

• Any applicable industry standards, national standards, national occupational health and safety commission and regulatory requirements

• Hazards associated with electrical circuit

• Site and manufacturer’s circuit specifications

Features and properties include in A datasheet, data sheet, which is document that summarizes the performance and other technical characteristics of a product, machine, component (e.g., an electronic component), material, and subsystem..)

• Site and manufacturer’s circuit specifications

• Hazards associated with electrical circuit

• Control of substances hazardous to health

• Regulatory codes of practice

Applicable industry standards Generally accepted requirements followed by the members of an industry.

National standards: a regionally adoptable standards for the safe installation of electrical wiring and equipment in the country

National occupational health and safety commission and regulatory requirements: The National Occupational Health and Safety Commission has declared a National Code of Practice for the Labelling of Workplace Substances. The National Occupational Health and Safety Commission is a tripartite body established by the Commonwealth Government to develop, facilitate and implement a national occupational health and safety strategy. This strategy includes standards development, the development of hazard-specific and industry based preventive strategies, research, training, information collection and dissemination and the development of common approaches to occupational health and safety legislation.

• Any applicable industry standards, national standards, national occupational health and safety commission and regulatory requirements

• Control of substances hazardous to health

• Regulatory codes of practice

• Hazards associated with electrical circuit