Section 2: Facility Requirements FC-4400 Facility and Installation Guide
0101-9030-0, Rev. D
2-5
FC-4400 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.
The high-voltage cable connecting the power module to the filament power supply is
adequately grounded when the coaxial cable is plugged into the filament power supply.
For an illustration of the low-impedance grounding measures required on systems with
CV-6SLX and CV-6SLX power supplies, see Figure 2-3.
