SkyTracker STX-1-2000 - Power Diodes; Auto Strike Assembly

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Changing the letter taps (W, X, Y, Z) has a greater effect on voltage. Also, changing the

numbertaps(1,2,3,4)hasasmall“netuning”effect.Thehighestsetting(Z-4)givesthe

highest lamp output and the lowest setting (W-1) gives the lowest lamp output. Taps on the

(6) terminal boards MUST be changed in unison (i.e. three terminal boards set on #2 taps

and three terminal boards set on “X” taps. See Figure 6).

4.5.3 POWER DIODES

Silicon diodes, located on large heat sinks, are attached to each power supply. The diodes

convert the AC to DC, which is necessary for operation of the Xenon lamps. While diodes

are very reliable, they sometimes fail due to voltage surges or “spikes” which sometimes

occur, particularly with improperly regulated generators.

4.5.4 AUTO STRIKE ASSEMBLY – (STX-4 XENON LAMP AUTOMATIC IGNITION)

The Auto Strike Assembly is a module consisting of a printed circuit board and related com-

ponents located near each power supply. Functionally, this circuit activates the igniter circuit

when it senses that the light has been turned on, but the bulb is not drawing any current. It

provides igniter bursts to the lamp and then locks itself out to prevent overloading and po-

tential burn-out of the primary igniter transformer. The auto strike can be re-activated by

ippingthe“Master”switchoffandthenbackonagain.

INPUT FROM

CONTACTOR

VOLTAGE ADJUSTMENT TAPS

(Three Phase)

FIGURE 6