Functional Description
MS Detector
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______________________ Finnigan LTQ Hardware Manual _______________________
Electronic Assemblies
The electronic assemblies that control the operation of the MS detector are
distributed among various printed circuit boards (PCBs) and other modules
located in the electronics rack and on or around the vacuum manifold of the
MS detector.
The electronic assemblies of the MS detector include the following:
•
Power Module and power distribution assemblies
•
System control and monitoring circuitry
•
RF/waveform voltage generation electronic assemblies
•
Ion detection system electronic assemblies
Power Entry Module and Power Distribution
The Power Entry Module provides system power control, a contact closure
interface, an Ethernet 100 Base T connection from the Power/Signal
Distribution PCB to the data system PC, and a system reset button. See
Figure 2-6 on page 2-10.
The Power Entry Module accepts line power, filters it, and provides it to
various components of the MS detector. The Power Entry Module includes
the following components:
•
Main power circuit breaker switch
•
Line filter
•
Electronics service switch
•
Interlock PCB
A functional block diagram of the Power Entry Module and MS detector
power distribution is shown in Figure 2-18.
Line power (230 V ac ± 10%, 15 A, 50/60 Hz, single phase) enters the power
panel on the right side panel of the MS detector, passes through the main
power circuit breaker and then to a line filter (see Figure 2-6).
The main power circuit breaker switch, located on the right side panel of the
MS detector (see Figure 2-6), shuts off all power to the MS detector, including
the vacuum system. After the main power circuit breaker switch, power goes
to the line filter.
The line filter removes noise from the line power.
After the line filter, power goes to the Power/Signal Distribution PCB and to
the electronics service switch.
The electronics service switch is a circuit breaker that allows service of the
non-vacuum system components of the MS detector with the vacuum system
still in operation (see Figure 2-6). In the Service position the switch removes
