Inst ToolsInst ToolsInst Tools
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Search
  • Books
  • Software
  • Projects
  • Process
  • Tools
  • Basics
  • Formula
  • Power Plant
  • Root Cause Analysis
  • Electrical Basics
  • Animation
  • Standards
  • 4-20 mA Course
  • Siemens PLC Course
Reading: Diagnosing Electric Motor Circuit
Share
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • Design
  • PLC
  • Interview
  • Control System
Search
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Practical Questions > Diagnosing Electric Motor Circuit

Diagnosing Electric Motor Circuit

Last updated: January 8, 2020 2:41 pm
Editorial Staff
Practical Questions
No Comments
Share
2 Min Read
SHARE

Suppose the electric motor refuses to run when the “Run” pushbutton switch is pressed. A technician begins diagnosing electric motor circuit following the steps shown (in order):

  • Test 1: Measured 12 volts DC between points C and D, with “Run” switch pressed.
  • Test 2: Measured 0 volts DC between points A and C, with “Run” switch unpressed.
  • Test 3: Measured 12 volts DC between points A and B, with “Run” switch pressed.
  • Test 4: Measured 12 volts DC between points E and F, with “Run” switch pressed.
  • Test 5: Measured infinite ohms between points E and F, with “Run” switch unpressed.

Diagnosing Electric Motor Circuit

Diagnosing the Electric Motor Circuit

Identify any useful information about the nature or location of the fault derived from the results of each test, in order of the tests performed.

If the test is not useful (i.e. provides no new information), mark it as such. Assuming there is only one fault in the circuit, identify the location and nature of the fault as precisely as you can from the test results shown above.

Solution:

The fault is an “open,” between points E and F.

Share your answers & explanations.

Credits: Tony R. Kuphaldt

Read Next:

  • AC Motor Theory
  • Types of AC Generators
  • AC Generation Analysis
  • Series-Wound Motor
  • DC Generator Internal Losses
Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address
You've successfully subscribed !

Continue Reading

Motion-Balance and Force-Balance Instruments
Practical Process Control System Questions & Answers – 7
Identify the Pressure Gauge Error
Flow Transmitter Readings mismatch with DCS
Questions on Radar LT Loop Diagram
Moving Pressure Sensing Level Transmitter from Top to Bottom
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
Leave a Comment

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Stay Connected

128.3kFollowersLike
69.1kFollowersFollow
210kSubscribersSubscribe
38kFollowersFollow

Categories

Explore More

What Affect the Pressure Measurement Accuracy of a Manometer?
DP Transmitter Located 10 feet Beneath the Vessel
Question on Analytical Controller
LRV and URV of PT for Extreme Limits of Empty and Full
DP Transmitter Problem
Questions on Allen-Bradley MicroLogix 1000 PLC
Identify Level Control Loop Tuning Problems
Questions on Pressure Transmitter Calibration Setup

Keep Learning

Calculation of Hydrostatic Pressure

Calculation of Hydrostatic Pressure

4-wire pH Transmitter Problem

pH Transmitter Problem

Relay ladder diagram example

How to Draw a Schematic Diagram ?

Problem on Solar Hot Air Collector and Variable Speed Fan

Problem on Solar Hot Air Collector and Variable Speed Fan

PLC Programming Questions

PLC Programming Question & Answer

Resistance Temperature Detector (RTD) Questions

Resistance Temperature Detector (RTD) Questions – 1

Smart DP transmitter Formula

Smart DP Transmitter Flow Meter Calculations

Loop Diagram

PT Loop Diagram Faults

Learn More

Foundation Fieldbus

Foundation Fieldbus – Advantages, Limitations, Architecture

Glass Bottle Level Gauge

Antifriction Bearings Caused Machine Changeovers Posed Outages

Thermocouple Extension Lead Problem

Thermocouple Extension Lead Problem

Electric Circuits Objective Questions

Electric Circuits Objective Questions – Set 3

OPC Communication Interview Questions Answers

OPC Communication Interview Questions and Answers

Mathematical Models of Physical Systems

Differential Equations of Physical Systems & Dynamics of Robotic Mechanisms

PID Tuner

Free PID Controller Gains Tuning Tool

igbt-symbol

Types of IGBT

Menu

  • About
  • Privacy Policy
  • Copyright

Quick Links

  • Learn PLC
  • Helping Hand
  • Part Time Job

YouTube Subscribe

Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?