IEC 61347-2-6:2000 pdf free download – Lamp controlgear
15Abnormal conditions
The ballast shall not impair safety when operated under abnormal conditions at the maximumvalue of the rated voltage range.
Abnormal conditions are working conditions in which one or more of the following apply:
a) the lamp or one of the lamps is not inserted;
b) the lamp does not start because one of the cathodes is broken;
c) the lamp does not start although the cathode circuits are intact (deactivated lamp);d) the lamp operates, but one of the cathodes is deactivated or broken (rectifying effect).Compliance is checked by the following test.
Each of the abnormal conditions specified above shall be applied with the ballast operatingaccording to the manufacturer’s instructions (including heatsinks, if specified) for 1 h at themaximum limit of the temperature range for which the ballast is designed.
For the test simulating operation with a de-activated lamp,a resistor shall be connected inplace of each lamp cathode.The resistor value shall be derived from the value of the nominalrunning current of the lamp specified in the relevant lamp data sheet of IEC 60081 andIEC 60901 and substituted in the following equation:
For lamps not covered by lEC 60081 and lEC 60901,the values declared by the lampmanufacturer shall be used.
When testing d.c. supplied electronic ballasts for the rectifying effect,the circuit shown infigure 2 shall be used. The lamp shall be connected to the midpoints of the appropriateequivalent resistors.The rectiier polarity shall be chosen so as to give the most unfavourableoperating conditions. lf necessary, the lamp shall be started using a suitable starting device;e) polarity reversal
When a ballast is declared to be proof against supply voltage polarity reversal it shall be testedas follows.
– Ballasts intended for operation from power sources likely to have attendant transients andsurges shall be operated with reverse voltage for 1 h at the maximum voltage of the ratedvoltage range and with appropriate lamp(s).
– During this period,the ballasts shall withstand without failure the number of pulse voltagesspecified in table 2 superimposed with the same polarity on the supply voltage.
During and at the end of the tests specified under items a) to e), the ballasts shall show nodefect impairing safety, nor shall any smoke be produced.
Components
Psu, power supply unit,capable of charging C to a value equal to the maximum of voltage range plus eight times the design voltage.
PSu2 power supply unit,capable of running the invertor under test at the maximum of thedesign voltage range.
NOTE 1 Preferably both PSUs should be fitted with current limits to prevent damage in the event of the invertorunder test breaking down.
B battery to trigger TH: typically 7 v d.c. to 10 v d.c.
R resistor to limit inrush current to capacitor C.
R2 gate-current limiting resistor for thyristor TH1.
Rg resistance whose value is chosen according to the requirements of figure G.1 oflEC 61347-1.
D1 reverse current by-pass diode for THallows initial oscillatory transients to operate.Switch-on and -off times shall be compatible with pulse current rise and duration.
D2 pulse blocking diode for PSu2.Switch-off time shall be compatible with transient pulsewidth.
TH, main switching thyristor used to apply voltage pulse. Switch-on time shall becompatible with current rise time.
c capacitor chosen in accordance with the instructions of figure G.1 of lEC 61347-1.two inductors to simulate the self-inductance of the wiring of the installation in whichthe invertor is incorporated.
NOTE 2 A value of 7 uH to 8 uH for each conductor is provisionally specified.