Service manual

Getting Started 11Chapter 1
Initial Mainframe Setup
The E8408A mainframe is shipped from the factory ready to use. This
section describes procedures for initial mainframe setup, including:
• AC Power Requirements
• Positioning the Mainframe for Adequate Cooling
• Connecting Permanent Earth Ground
Note This chapter shows initial setup procedures for the Standard Configuration.
See
Chapter 2 - Installing Mainframe Options for information on rack
mounting the mainframe and installing mainframe options.
AC Power
Requirements
The E8408A mainframe can be operated at line voltages of 90 - 140 Vac (@
47 Hz to 440 Hz) or 90 - 264 Vac (@47 - 66 Hz). The mainframe ships with
a power cord and with a fuse installed in the power supply. The fuse is
suitable for all line voltages, but is not accessible.
Appendix A - E8408A
Product Specifications
contains input power specifications.
WARNING The power cord is the only way to disconnect the mainframe
from AC power. Therefore, the power cord must be accessible
to the operator at all times. When the E8408A mainframe is
mounted in a system cabinet, the power cord need not be
accessible since the cabinet must have its own disconnect
device. Some fault conditions require removal of AC power for
recovery to occur. See Chapter 3 - Servicing the Mainframe .
Positioning the
Mainframe for
Adequate Cooling
A cooling fan provides air for module and power supply cooling. The fan
operates in Variable Speed or Full Speed mode as controlled by the front
panel Fan Speed switch. Full Speed mode is recommended for maximum
cooling when acoustic noise is not a factor.
Variable Speed mode allows quietest operation while providing sufficient
power supply and module cooling. In Variable Speed mode, the fan speed
is controlled automatically as a function of temperature rise in the mainframe
and the ambient temperature.
Airflow enters the E8408A mainframe rear panel, flows through the power
supply, fan and modules and exhausts out the left side (as viewed from the
front in horizontal orientation). This allows mainframes to be stacked or
rack-mounted directly on top of one another.
When placing the mainframe on a work bench or if the mainframe is rack
mounted, provide at least a one-inch clearance at the back and sides to
allow proper air flow. (Air filters are not necessary on E8408A mainframes.)