Neptune 5000
© Copyright Datem Limited 2014
17
The Power Supply Circuitry provides +15Vdc, -15Vdc, +5Vdc, -5Vdc and 0V.
The +/-15Vdc and 0V is used to power the Topside Telemetry Board and the
+/-5Vdc and 0V is used to power the sensing circuits and the LCD displays.
Green LED indicators show the status of the four dc voltages. During normal
operation all four indicators will be illuminated. If any are not illuminated this
is indicative of a fault and the Topside Control Box should be switched off. The
fault should be investigated and rectified before switching on the Topside
Control Box.
The Current Sensing Circuit consists of a current sensing transformer (CT1)
and amplification stage. The ammeter signals are output on PL6, and PL8
provides the +/-5Vdc power to the ammeter display.
The High Voltage output from TXF1 connects to the Topside Power Supply
Board on connector PL3. It then passes through the high voltage sensing
circuitry and then exits the board on PL4. The high voltage sensing circuit
comprises a divider network, isolating transformer (TR1) and a bridge rectifier.
The voltmeter signals are output on PL5, and PL7 provides the +/-5Vdc power.
The Topside Power Supply Board has only one fuse, FU1. This provides
protection for the power supply components only. If this fuse blows this is
indicative of a fault and the Topside Control Box should be switched off. The
fault should be investigated and rectified before switching on the Topside
Control Box.
WARNING
Whenever the Topside control box is switched on the Topside Power
Supply Board could have both 240vac and 650vac on various exposed
components
Specification
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