Troubleshoot AC Motors – Part 1
This is a 4 part series, click to view each part: 1 : 2 : 3 : 4
Problem A – Motor won’t start or motor accelerates too slowly
A1: Check input power to starter. Is there power on all lines? (Three-phase motors won’t start on one-phase.) | Restore power on all lines | |
A2: Check starter. Is overload protection device opened? | Replace or reset device. Does it open again when starting? | |
A3: Is there power on all lines to motor? | Repair starter | |
A4: Is voltage to motor more than 10% below nameplate voltage? | Restore proper voltage. | |
A5: Check motor terminal connections. Are any loose or broken? | Repair connections. | |
A6: May be wrong motor for application. Is starting load too high? | Install Design C or Design D motor. Install larger motor. | |
A7: Is driven machine jammed or overloaded? | Remove jam or overload. | |
A8: Are misalignments, bad bearings or damaged components causing excessive friction in driven machine or power transmission system? | Repair or replace component. | |
A9: Are bad bearings, bent shaft, damaged end bells, rubbing fan or rotor or other problem causing excessive friction in the motor? | Repair or replace motor. | |
A10: Check stator. Are any coils open, shored or grounded? | Repair coil or replace motor. | |
A11: Check commutator. Are any bars or rings broken? | Replace rotor. |
Related Articles
OEE: Overall Equipment Effectiveness
OEE: Overall Equipment Effectiveness Author Mike Sondalini with permission of BIN95 Industrial Training Oh "Equipment Effectiveness", I've heard about that before! Unfortunately,...
What the Pump Was Designed to Do and Why it Doesn't Do it
What the Pump Was Designed to Do and Why it Doesn't Do It Ross Mackay Contrary to popular opinion, a...
What is Wrong with the Modern Centrifugal Pump?
What is Wrong with the Modern Centrifugal Pump? www.mcnallyinstitute.com Ask for a pump recommendation from your favorite supplier and chances...
Improving Air System Efficiency
by R.S. Foss Part 4: Dealing with pressure drop and correctly sizing the piping system. When sizing pipe for a...
Digging Up Savings: Go with the Flow
Digging Up Savings: Go with the Flow Mark A. Morton and Sheldon V. Shepherd Detecting bulk solids flow with acoustic...
Chain Drive Design Recommendations
Chain Drive Design Recommendations Ramsey Products For optimum chain drive performance the following points should be considered when looking at...
Bearing Concept Overcomes the Need for Compromise
Bearing Concept Overcomes the Need for Compromise www.engineerlive.com Usually the choice between ball bearings and roller bearings is straightforward, with...