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WARNING: Disconnect primary power prior to servicing.
Overall System Theory
4.4 Power Supply Block Diagram Description
There are two different types of power supplies in the transmitter, the PA Power
Supply and the Low Voltage Power Supply.
4.4.1 PA Power Supply
There are three power supply configurations available for the Z5 transmitter:
• 3-Phase, 3 wire (198-250VAC)
• 3-Phase, 4 wire (342-432VAC)
• Single Phase (198-250VAC)
The supplies are very much alike operationally. The 3-Phase 3 wire and 4 wire
supplies have all of the same components, but have a different wiring harness. The
PA power supplies, whether 3-Phase or Single Phase, are regulated by reliable tap
switching techniques which provides excellent efficiency, while avoiding the power
line harmonic problems associated with switching supplies. The regulation range is
48-54Vdc at 2Vdc per tap.
4.4.1.1 3-Phase Power Supply
The Z5 transmitter uses dual main power transformers whose DC outputs are
combined through large inductive chokes. Figure 4-7 shows a simplified diagram of
one of the PA power supply transformers.
Figure 4-7 3-Phase Power Supply Simplified Diagram (1 Transformer)
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