Motor Testing
In-Rush/Start-Up Current Test Prevents Catastrophic Failure
The In-Rush/Start-up test was designed to look at the in-rush and decay of current during a direct start. In this case study, we evaluate the answer as it applies to a utility company...
- Noah Bethel
- PdMA Corporation
Energized Motor Testing Reveals Improper VFD Settings
This 55-kilowatt, 400-volt motor is controlled by a variable frequency drive (VFD). This motor drives the centrifugal fan that sends air into a natural gas combustion burner...
- Ettore Di Pasquale
- ALL-TEST PRO
What is 3 Minutes of Motor Testing Worth to You?
A motor distributor in the Netherlands provided a 17 Kilowatt, 400-Volt motor to a local hospital in 2015. The hospital rented a portable crane to install the motor onto the roof of the building. The motor is used to operate a fan that is mounted on the hospital’s roof...
- Richard Scott
- ALL-TEST PRO
Deep Well Vertical Pump Analysis using Electrical Signature Analysis (ESA)
There are many advantages that vertical pumps provide over horizontally mounted pumps and when they operate properly they generally provide many years of reliable, maintenance free operation. However, in almost any plant with a large inventory of vertical pumps they will have one or more of these pumps that are considered “bad actors”...
Analytical Ferrography Forensics
A steel mill uses this pump to boost the water pressure it supplies to the hot mill for descaling. Thin scale forms rapidly on the hot slab and must be removed before entering the mill stands...
Analytical Ferrography Forensics II
A steel mill uses this motor to drive a double reduction gearbox on a roughing mill at an input speed of 450 rpm. The motor has babbitt sleeve bearings...
Vibration Measurement Techniques for Continuously Varying Speed Machinery
There are a lot of equipment types in industry that exhibit continuously varying speed. This presents a number of challenges to the vibration analyst. If a time sample is collected as the machine is continuously changing speed, the FFT will produce a virtually useless plot...
- Greg Lee
- PRUFTECHNIK
How Do You Make Your Condition Monitoring Program More Valuable?
If you are involved with condition monitoring you probably believe you add value to the organization; your warnings of impending failure allow the company to avoid downtime, reduce costs, and much more. But does management believe you are providing a valuable service...
- Jason Tranter
- Mobius Institute
Current Unbalance in AC Electric Motors
Is there a standard for current unbalance in AC motors...
- Howard Penrose
- MotorDoc LLC