TROUBLESHOOTING FLUORESCENT LAMPS in .NET framework

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TROUBLESHOOTING FLUORESCENT LAMPS
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Hints for troubleshooting uorescent lamps are given in Table 5-2
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FIGURE 5-10 Typical fluorescent tube pin base
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LAMP AND LIGHTING SYSTEMS
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TABLE 5-2 Troubleshooting Chart Condition (I) Lamps won t start (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (II) Short lamp life (1) (2) (3) (4) Possible Causes to Investigate
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Lamp failure Poor lamp-to-lampholder contact Incorrect wiring Low voltage supply Dirty lamps or lamp pins Defective starters* Low or high lamp bulb-wall temperature High humidity Fixture not grounded Improper ballast application Ballast failure Improper voltage Improper wiring Poor lamp-to-lampholder contact Extremely short duty cycles (greater than average number of lamp starts per day; check with lamp manufacturer) Defective starters* Defective lamps Improper ballast application Defective ballast
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(5) (6) (7) (8) (III) Lamp icker (spiraling or swirling effect)
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(1) New lamps (should be operated 100 hours for proper seasoning) (2) Defective starters* (3) Drafts on lamp bulb from airconditioning system (lamp too cold) (4) Defective lamps (5) Improper voltage (6) Improper ballast application (7) Defective ballast (1) Loose xture louvers, panels, or other parts (2) Insecure ballast mounting (3) Improper ballast selection (4) Defective ballast (continued)
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(IV) Audible ballast hum
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CHAPTER FIVE
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TABLE 5-2 Troubleshooting Chart (continued ) Condition (V) Very slow starting Possible Causes to Investigate (1) Improper voltage too low (2) Inadequate lamp-starting-aid strip** (refer to xture manufacturer) (3) Poor lamp-to-lampholder contact (4) Defective starter* (5) Defective lamp (6) Improper circuit wiring (7) Improper ballast application (8) High humidity (9) Bulb-Wall temperature too low or too high (1) Improper xture design or ballast application (refer to xture manufacturer) (2) High voltage (3) Improper wiring or installation (4) Defective ballast (5) Poor lamp maintenance (instantstart and preheat systems) (6) Wrong type of lamps (7) Wrong number of lamps (1) Improper xture design or ballast application (refer to xture manufacturer) (2) High voltage (3) Improper wiring or installation (4) Defective ballast (5) Poor lamp maintenance (instantstart and preheat systems) (6) Wrong type of lamps (7) Wrong number of lamps (8) High ambient temperature
(VI) Excessive ballast heating over 90 C ballast case temperature
(VII) Blinking
*Applies only to preheat (switch-start) circuits **Applies to only rapid-start and trigger-start circuits
LAMP AND LIGHTING SYSTEMS
OTHER TYPES OF LAMPS
In addition to incandescent and uorescent lamps, there are other sources of light; among them are mercury vapor lamps, metal halide lamps, and sodium lamps
MERCURY VAPOR LAMPS
Mercury vapor lamps are commonly used in shopping centers, parking lots, in large farmyards, and along highways A mercury vapor lamp is an arc-discharging, non- lament device Once the arc is struck and the unit is emitting light, some type of ballast is usually required to limit the current ow to the device There are two general types of mercury vapor lamps:
Those that require the addition of a ballast some place on the xture Those that are self-ballasted The two types are similar in appearance, and you must be careful to screw the bulb only into a socket designed for its speci c type Figure 5-11 shows a typical screw-in mercury lamp that is not self-ballasted Many mercury vapor lamps mounted on poles in parking lots, in farm-yards, or along the highways have a photoelectric eye that turns the xture on at dusk and off at dawn Often the lamp needs time to warm up to full brilliance Possible problems with mercury vapor lamps include a burnedout lamp, a loose or broken wire, a bad photoelectric switch, and, if the lamp is not self-ballasted, a burned-out ballast The more often the lamp is started, the shorter its life expectancy The mercury vapor lamps used on farms and in commercial parking lots last about 24,000 hours, or 7 years when used with an automatic on-off switch for operation every night The best way to troubleshoot a mercury vapor lamp is with a meter Check the bulb rst to see if it is operational Then check the on-off switch or photoelectric switch To do this, short the two wires to the switch together If light comes on, the switch is not defective Remember, however, that it may take a few minutes for the lamp to begin to glow If the bulb is not self-ballasted, disconnect the ballast and test it with an ohmmeter for shorts and opens
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