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Tag: electrical troubleshooting
Electrical Troubleshooting Quiz
2013-05-13 18:26:00| Electrical Construction & Maintenance
Tags: electrical
quiz
troubleshooting
electrical troubleshooting
Electrical Troubleshooting Quiz
2013-04-19 21:00:00| Electrical Construction & Maintenance
A complex gearbox system has a left and a right main drive gear. Because of an outdated controller, every six months or so one of these gears gets overloaded and strips out. It takes three hours to change the gear, but only 25 minutes to pull and replace the gearbox. Downtime runs about $400,000 an hour in revenue. You are fairly sure that a more responsive controller would keep the left and right side loads balanced, thus preventing the damage. But the production superintendent won’t sign off on that or a spare assembly. To solve this problem, what should you do? read more
Tags: electrical
quiz
troubleshooting
electrical troubleshooting
Electrical Troubleshooting Quiz
2013-04-08 21:34:00| Electrical Construction & Maintenance
One of the plant's four plant air compressors blew a 100A fuse. The other two fuses are OK. After a few incidents where "blind fuse replacement" resulted in equipment damage, the plant engineer issued a memo stating that no fuse will be replaced until a determination has been made as to why it blew. Unfortunately, the memo didn't include instructions, and the maintenance department hasn't developed a checklist. Your DMM doesn't show a direct short. If the fuse blew due to a random event, you could be here all day running tests. read more
Tags: electrical
quiz
troubleshooting
electrical troubleshooting
Electrical Troubleshooting Quiz
2013-03-22 22:25:00| Electrical Construction & Maintenance
Every few days, a 40 hp motor blows its overloads. These have been verified as being the correct size. The maintenance manager suspected the branch circuit breaker was faulty, so had that tested but it's fine. The motor drives a mixer tank impeller. Wet and dry materials come into the tank and mix for ten minutes. The mixed solution is sprayed onto a fixture that passes along to the next step in production. If the motor is down for long, the fixture becomes clogged. It takes a full shift to restore production. How can you find out what’s going on? read more
Tags: electrical
quiz
troubleshooting
electrical troubleshooting
Electrical Troubleshooting Quiz
2013-03-08 22:24:00| Electrical Construction & Maintenance
Lately, there's been a rash of lighting problems. These have included dim lighting, flickering lights, ballast failure, and lamp failure. The last two issues are particularly puzzling, because the ballast are only a few years old and the lamps are on a relamping program and nowhere near their expected end of life. read more
Tags: electrical
quiz
troubleshooting
electrical troubleshooting
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