FC-3800 Facility and Installation Guide
Section 2: Facility Requirements
0101-8604-0, Rev. F
2-5
FC-3800 F & I Guide
2.5.2 Low-Impedance Ground for the E-Beam Power Supply
Figure 2-2 illustrates the grounding requirements for the Simba 2 power supply. A length
of 3-in.-wide copper strap must connect the Simba 2 power module to the system’s
central grounding point. In addition, the shield of the high-voltage cable running between
the gun interface and the filament transformer must be connected to the vacuum
cubicle’s central grounding point, as shown in Figure 2-2. The gun interface chassis must
also be connected to the system’s low-impedance ground. If the gun interface is mounted
in the optional control console, the gun interface can be grounded in one of two ways. A
length of copper strap can connect its grounding lug directly to the system’s central
grounding point, as indicated in Figure 2-2. Alternatively, a short length of copper strap
can be used to connect grounding lug on the gun interface to the grounding bracket on
the Simba 2 power module, as indicated in Figure 3-9. If the gun interface is mounted in
the operator station, its low-impedance ground is provided by the length of copper strap
that connects the operator station to the system’s central grounding point.
Figure 2-2 Vacuum Cubicle Grounding for Simba 2 Power Supply
On systems with CV-6SLX and CV-12SLX power supplies, the power module is mounted
in the operator station, so its low-impedance ground is likewise provided by the length of
copper strap that connects the operator station to the system’s central grounding point.
On these power supplies, the high-voltage cable connecting the power module to the
filament power supply (FPS) is adequately grounded when the coaxial cable is plugged
into the FPS. For an illustration of the low-impedance grounding requirements on
systems with a CV-6SLX and a CV-6SLX power supply, see Figure 2-3.
