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At iFLY Seattle, a preventive maintenance program on the electrical systems at the heart of the facility keeps the air moving in the vertical wind tunnel (VWT). Parts of the program: powering down for static tests, conducting tests under power, and attending to what demands special attention. View examples in this slideshow. Go to article ››
As the first step, Zach Bryson, Project Manager for Keithly Electric Company, locks out and tags the power supply at iFLY Seattle. Initial inspection will proceed with the facility de-energized.
Suited up for arc flash safety, Bryson uses Fluke 87V Industrial Multimeters to verify that all sources of energy were isolated by lockout. The team used two meters - checking phase-to-phase, and phase-to-ground with each meter to verify all sources of energy have been discharged (capacitor bank).
Wireless test tools, like this wireless infrared camera, enable the customer to be directly emailed images from any Fluke CNX™ Wireless System via iPhone. Utilizing wireless devices reduces lag time between detection of issues and generating the report (usually performed at the shop/office). Information can be shared almost immediately between peers, management and/or equipment owners.
After verifying that all sources of energy have been isolated, Keithly technician Greg Burdick uses the Fluke 1630 Earth Ground Clamp Meter to check grounding at the harmonics filter.
Bryson fits an iFlex® flexible current probe at the harmonics filter, in preparation for further testing. A variety of wireless tests will be done after covers are re-installed.
Mark Lord, an experienced HVAC technician at Gwinnett Schools in the Atlanta area, received a call from the buildings operations manager. A fault on Tower fan #1 was causing cooling problems.
Mark measured the control signal loop in a low-voltage relay cabinet, the source of the control room signal, with a Fluke 773 Milliamp Process Meter. All checked out as normal.
Looking at the 4-20 milliamp signal in the VFD before powering it, and the pump, down to do further inspection.
After shutting off power to that part of the system, Mark double-checks that power is absent. Performing this verification, and continuing to wear PPE, are important safety measures.
Mark uses the Fluke 1587 Insulation Multimeter to check the wiring from the VFD to the exterior fan disconnect. When the wiring to the disconnect is okay, he needs only one more test.
At the disconnect on the cooling tower, Mark uses his Fluke 1587 to check the short wiring run up the tower to the fan motor and finds that one leg of the fan motor is bad. This motor needs replacement. Fortunately, redundant systems are in place that can continue to cool the building while a new motor is installed.