The Keysight/Agilent/HP E840xA Fan Assembly is a thermal management component engineered to maintain optimal operating temperatures within E8400 Series VXI mainframes. The assembly integrates an impeller module fan and power supply fan(s) into a coordinated cooling system, with operation controlled via a two-position front panel switch supporting both Variable Speed Mode and Full Speed Mode.
## Technical Specifications
The fan assembly operates in two distinct modes. Variable Speed Mode adjusts fan velocity based on internal and ambient mainframe temperatures, enabling quieter operation while delivering adequate cooling for installed modules. Full Speed Mode runs all air movers—including the cardcage impeller and power supply fan(s)—at maximum capacity, recommended when acoustic noise is not a limiting factor.
Diagnostic and monitoring capabilities vary by mainframe model. The E8401A and E8403A provide basic monitoring indicating normal operating conditions via a front panel diagnostics connector. The E8404A model features enhanced monitoring accessible through a full-color display or via VXIbus and RS-232 connection, reporting temperatures, power supply voltages and currents, fan operation status, and system diagnostics.
## Key Features
• Dual-mode fan control: Variable Speed and Full Speed operation
• Integrated air distribution system for efficient thermal management
• Impeller and power supply fan components
• Front panel diagnostics connector for local or remote system monitoring
• Flashing Fan indicator alerts on impeller or power supply fan failure
• Customer self-repair limited to specific assemblies; power supply fans require full power supply assembly replacement
• Component replacement should be performed by trained service personnel at static-controlled workstations
## Compatibility & Integration
The E840xA Fan Assembly integrates with Keysight/Agilent/HP E8400 Series VXI mainframes: E8401A, E8403A, and E8404A. These are C-size, 13-slot VXI units. The fan assembly functions as an integral subsystem within the mainframe’s thermal management architecture, supporting proper operating temperature maintenance across all installed modules.
