Rockwell Automation PDC24 / PAC Chassis Power Supplies - Manual (Page 4)

4 PDC24 / PAC October 2005 – Issue 3
Triguard SC300E
TECHNICAL DESCRIPTION
PHYSICAL
The PSU comprises a front plate mounted at right angles to a chassis plate. All the user
controls and indicators are mounted on the front plate as shown in Figure 1-1.
The chassis plate supports three main items:
• Power supply unit: A self-contained switch-mode power supply unit (SMPS).
• Front panel PCB: Contains printed wiring and physical support for the controls and
indicators that are viewed and accessed from the front panel.
• PSU interface PCB: Contains the power share and fault alarm circuits. Interfaces these
circuits and the SMPS to the SC300E chassis backplane via connector PL3.
A ribbon cable connects the front panel PCB to the SMPS. A mechanical stop fitted to the AC
system chassis power supply slots (marked AC STUD) prevents the insertion of a PDC24 into
a PAC slot.