Figure 4-4 Component Location In Standard Fps Units (Pn 0620-6604-0 And -1) - ferrotec Temescal CV-12SLX User Manual

Section 4: Theory of Operation 4.3 FPS Theory of Operation
modules with PNs 0620-6604-0 and -1). Figure 4-5 is a top-level block diagrams that applies to
those FPS modules. Figure 4-6 shows internal component locations in FPS units with PN 0620-
6604-2. Figure 4-7 is a functional block diagram for those units. In all three variants, primary
power enters the FPS via J302 and is routed to the Filament Supply PCB. The FPS consists of
two major functional sections, the Filament Supply PCB and the Filament Output section. The
Filament Supply Board supplies and controls the filament power. The filament output section
combines the filament power with the negative HV from the power module and routes the
combination to the filament. As Figure 4-5 shows, the Filament Output section on standard FPS
units consists of an HV vacuum relay and a filament transformer. On FPS units with PN 0620-
6604-2, the Filament Output section consists only of a filament transformer (see Figure 4-7).
Section 4.3.4 describes the Filament output section in greater detail.
4.3.2 Safety Interlocks
The safety interlocks insure that circuits are safely connected and that the box is closed before
operation can continue. Safety interlocks are provided by switches S101 and S102 in the
filament output section of the FPS. These interlocks are routed to the Filament Supply PCB via
J103 pins 3 and 4 and are connected in series with the cover interlocks on the CV-12SLX power
module. Therefore, in order for FPS operation to take place, the FPS covers and the power
module covers must be in place, closing the interlock switches, and the FPS cover interlock
switches must be connected to the Filament Supply PCB.

Figure 4-4 Component Location in Standard FPS Units (PN 0620-6604-0 and -1)

0101-8292-0, Rev. C 4-5 CV-12SLX User Manual