When you send an electric motor out for repair, what information is provided back to you? Do you receive a formal, written quotation showing all of the items that are in need or repair, before they are done by your electric motor repair vendor? Or do you just get a repaired motor back, never knowing what was done to it?
Do you receive a final report once the motor is sent back, showing testing, measurements, and conditions of individual components of your motor? Or do you just get a repaired motor back with none of the test results that you paid for?
We believe that information is the key to everything in our modern times. It is becoming more and more difficult to convince upper management to make repairs or corrections, unless you have the information to provide to them. What needs to be done is less important than why it needs to be done in the first place. You must show the why to upper management in order to get things done in today's world.
So what type of information should you be getting from your vendor? Well, that varies on what you want. We have seen great one-page reports and great 20-page reports. In reverse we have seen terrible 100 page reports and terrible 2 page reports. We feel that it's good to start with figuring out what information you would like to see, here are some ideas:
- Full Nameplate Data of Motor
- Incoming & Final Test Run Voltage and Current for all three phases (if ran on incoming)
- Incoming & Final Test Run Vibration FFT spectrum & overalls (if ran on incoming)
- Incoming, After cleaning & Final 1-Minute insulation Resistance to Ground Readings
- Incoming & Final Polarization Index
- Incoming & Final Surge Comparison Test
- Incoming & Final Voltage Drop (DC Motors)
- Incoming & Final Hi-Potential Test
- Incoming & Final Shaft Current/Endfloat/Oil Condition
- Incoming & Final Air Gap Readings
- Critical machined fit readings (as requested)
- Incoming & Final Rotor TIR runouts of all shaft surfaces
- Final Balance of Rotor & Rotor assembly (with fan or coupling)
- Incoming Findings/Cause of Failure Analysis
- Pictures of failure and overall condition of motor
- Pictures of motor throughout the repair process
- Pictures of motor completed & prepared for shipment
- Various other pictures, tests, measurements, etc.
All of the items that show being repaired on the report, should tie back to the quotation or estimate you were provided showing the cost for correction. Between the report and the quotation you should know the full story behind what the condition of your motor was and why items needed to be repaired.
If you have never seen anything like this, talk with your electric motor repair vendor and see what they can do.
HECO - All Systems Go
About the author:
Justin Hatfield is Vice President of Operations at HECO. He is responsible for Electric Motor & Drive Sales, Electric Motor & Generator Repairs, Spare Solutions, and Predictive Services. Justin was instrumental in developing HECO MAPPS (Motor and Powertrain Performance Systems) which focuses on “why” you have a motor problem instead of simply “What” product or service should be recommended. HECO is an EASA Accredited Service Center for Electric Motors as well as a provider of predictive maintenance services and products throughout the United States.