Argantix XDS 100-100, User And Programming Manual

Page: 44 / 116

User and Programming Manual
44 XDS Series
6 Principle of Operation
6.1 General
An explanation of the circuits in the DC supply is given in this section. Refer to block diagram in
Figure 6-1.
6.2 Overall Description
Referring to block diagram in Figure 6-1 and Figure 6-2, the XDS DC power source consists of
one to three high power DC modules, a controller, and a power supply board. The controller
assembly uses a standard controller board and an optional GPIB board. An EMI filter is mounted
to the rear panel and also serves as the input connection to the three phase AC mains.
The three phase mains is connected at the rear panel and passes through the EMI filter to
provide AC power to each DC module and to the power supply board. Over current protection for
the AC input is provided by appropriately sized fuses on each module. There is no master switch
or circuit breaker, so, as long as mains power is applied to the input, the DC modules and power
supply board are powered. A front panel switch enables the DC supply board to put the whole
unit in the active state.
The controller, power supply, and each DC module are interconnected with a ribbon cable. This
ribbon cable serves as the Supply/Control bus. The low voltage power supplies are directed from
the power supply board to the controller and DC modules on this bus. Control signals also pass
between all assemblies on this bus. Among other uses, these signals program the output, sense
the output voltage, and detect fault conditions.
The standard interface assembly takes signals from the controller board and drives the RS232
connection on the rear panel.
A rear panel analog I/O connection allows remote isolated voltage and current programming of
the DC output and remote shut down.
The optional interface assembly (-IF option) provides the GPIB output.