SkyTracker STX-1-2000 - DC Power Supplies; Power Supply Contactors; Voltage Adjustment Terminal Board

CAUTION
Each lamphead is protected from overheating by a Thermal Switch. DO NOT
override this protection device as premature failure of the bulb may result.
Theexiblecoolingductsmustbeingoodcondition,securelymountedon
both ends and with no visible holes in the duct’s materials. The base cabinet
shouldalsobewithoutholesandwithallsidepanelsinplacetoinsuresuf-
cient cooling to each lamphead.
4.5 DC (Direct Current) POWER SUPPLIES
The DC power supplies are modular units. They consist of large transformers that lower
the input voltage down to a range of 25 to 45 volts to operate xenon bulbs. They also pro-
vide for a higher (125 to 150 volts) level required during the ignition phase. The output from
the transformer is converted to the direct current (DC) required to operate xenon bulbs by
siliconpowerdiodes(seesection4.5.3).Additionalpowerconditionandlteringisprovided
by capacitors mounted inside the power supply modules.
4.5.1 POWER SUPPLY CONTACTORS
The Power Supply Contactors (mounted on the top of each power supply) serve as the
main power switch to turn each power supply on and off. They are actuated when the
“Master” switch on the main control panel is turned to the “ON” position and the individual
“Lamp OFF” switch is in the “ON” position. However, if the lamphead thermal switch or
power supply thermal switch is opened due to an over-temperature condition, the contactor
for that particular head will not engage.
4.5.2 CURRENT ADJUSTMENT TERMINAL BOARD
The power supplies within each SkyTracker are provided with variable taps for adjusting the
current delivered to each xenon bulb. This feature is helpful if the input voltage (from either
regional power service or portable generator) is either higher or lower than “normal” rated
input voltage of the SkyTracker.
The taps are set at the factory for optimum performance with normal input voltages (see
section 3.1). For optimum SkyTracker performance consistent with long bulb life, the input
should be measured while the SkyTracker is in operation. If the input voltages vary below
orabovethelevelsspeciedinsection3.1,thetapsshouldbereset.
If input voltages are found to be lower than normal, a HIGHER tap setting will result in
normal rated lamp intensity. If input voltages are found to be higher than normal, a LOWER
tap setting will reduce the lamp intensity to normal levels and prolong bulb life.
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WATTAGE CURRENT RANGE NOMINAL DO NOT EXCEED
2000 50-90 A. 75 A. 90 A.
4000 90-150 A. 130 A. 150 A.