TECHNICAL REFERENCE
463
June 1999
96-8000
POWER-UP L OW V OLTAGE C ONTROL T RANSFORMER (T5)
The low voltage control transformer, T5, supplies power to the coil of the main contactor K1. It guarantees that
the maximum voltage leaving the Power Supply assembly when power is off is 12V AC to earth ground. It is
connected via P5 to the POWER PCB.
12.13 POWER T RANSFORMER A SSEMBLY (T1)
The power transformer assembly is used to convert three-phase input power (50/60Hz) to three phase 230V
and 115V power. Two different transformers are used depending on the input voltage range. The low voltage
transformer has four different input connections to allow for a range of voltages from 195 V RMS to 260 V RMS.
The high voltage transformer has five different input connections and will accept a range of voltages from 354V
RMS to 488 V RMS.
The 230 V is used to power the spindle drive, which also develops the 325 VDC power for the axis servo
amplifiers. The 115 V is used by the video monitor, solenoids, fans and pumps, in addition to supplying power
to the main LVPS used by the control electronics.
The transformer assembly is located in the lower right hand corner of the main cabinet. Besides the high/low
voltage variations, two different power levels are available depending on the spindle motor used. The small and
large transformers have power ratings of 14 KVA and 28 KVA, respectively. They are protected by the main
circuit breaker to the levels shown in the preceding table.
Transformer with 354-488V range Transformer with 195-260V range
PRIMARY C ONNECTION T O T1
Input power to T1 is supplied through CB1, the 40 amp three-phase main circuit breaker. Three-phase 230 to
T1 is connected to the first three terminals of TB10.
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