Tcd Amplifier Pcb; Fpd Amplifier And Interface Pcbs; Dtc Backplane Pcb; Ac Conditioning Pcb - ABB PGC2000 Operation And Service Manual

TCD Amplifier PCB

The TCD Amplifier PCB, on the left side wall of the GCC, amplifies the thermal conductivity detector
output signal and provides it to the Chroma I/O Board for processing.

FPD Amplifier and Interface PCBs

The FPD Amplifier PCB linearizes and amplifies the flame photometric detector output signal and
applies it to the Chroma I/O Board for processing. This assembly also contains circuitry for control of
thermoelectric coolers for the photomultiplier tube and for FPD flame sensing and ignition,
conditioned through the FPD Interface Assembly. It is located inside the FPD panel at the left of the
analyzer.

DTC Backplane PCB

The DTC Backplane PCB, located on the GCC right-hand door, has two micro controller chips, one to
run the DTC Backplane PCB and the other to check continuously for over-temperature conditions in
the temperature controlled zones. If the temperature in any zone exceeds the T-Rating limit, the DTC
Backplane PCB shuts off power to the temperature zones and aborts the analysis.

AC Conditioning PCB

The AC Conditioning PCBs, piggybacked on the DTC Backplane PCB, provide AC heater voltage to
the zone boards, power compensation and zero crossing signals to the DTC Backplane PCB, and the
coolant control output to the Coolant Control Solenoid.

DTC Zone PCB

The DTC Zone PCBs, piggybacked on the DTC Backplane PCB, provide individual zone temperature
sensing and power application to heaters for each zone of the digital temperature controller.

EPC Multibus PCB

The Electronic Pressure Control Multibus PCB, located in Card Cage slot 4, continuously checks the
pressure controlled zones. If any zone loses pressure control, the Electronic Pressure Control
Multibus PCB sends an alarm to the Single Board Computer PCB, which aborts the analysis.

EPC Control PCB

The EPC Control PCB, mounted in the EPC Module, provides the overall control for the electronic
pressure controller.

EPC Sensor PCB

The EPC Sensor PCBs, mounted on the pressure transducers in the EPC Module, provide the
individual zone pressure data to the EPC Module PCB.

LO COMM PCB (Option)

The Local Communications Module (LO COMM) PCB, piggybacked on the Front Panel PCB,
provides remote access for the analyzer, so that this analyzer can operate with other Vista GCC front
panels. See 'REMOTE GC OPERATION OPTION" for a detailed explanation of remote GC
operation.
2000-OSM, F1 4-12