Connection Of System Control Unit (Scu) - Pacific Power Source ASX series Operation Manual

SECTION 3 INSTALLATION
3.5

CONNECTION OF SYSTEM CONTROL UNIT (SCU)

This paragraph describes the connection of the System Control Unit (SCU) to an ASX-Series
Power Source.
Figure 3.5.1 shows the SCU connected to the Model 360-ASX Power Source. (Other models are
connected similarly.) In this configuration, the controller is removed from the power source chassis
and replaced with patch cables which route signals to the rear panel. Two shielded 30-conductor
(15 twisted pairs) cable assemblies are used to connect the SCU to the power source. The cables
are wired one-to-one and outfitted with DB-25P connectors on both ends. Hence, they cannot be
installed backwards. This interface is designed to operate with cable lengths up to 50 feet.
Cables, ten feet in length, are stocked by Pacific Power Source as P/N 134121. Contact Customer
Service for cables of lengths other than ten feet. Refer to the UPC-Series Operation Manual for
details regarding the SCU.
Note that in this configuration, Remote Interface ( GPIB or RS-232) and AUX I/O connections are
made at the SCU.
UPC INSTALLATION
The ASX-Series controller is modular in nature. This is a design feature which allows the user to
tailor the control characteristics of the system. While it is possible to change controllers in the field,
Pacific Power Source (PPS) recommends that the unit be returned to the factory when controller
exchange is desired. This insures proper installation and calibration of the system by PPS
technicians.
The installation of the UPC is described in the UPC-Series Operation Manual. The procedure is
stated for installation into the System Control Unit (SCU). Installation of the UPC into the power
source chassis proceeds in a similar manner. The primary difference between the various units is
the routing of the ribbon cables to the rear panel. Be sure to note the routing of these cables before
removing the existing controller; install the ribbon cables of the new UPC using the same routing.
After the new UPC is in place and connected, calibration is required. Refer to Section 6 of this
manual.
67