Chassis Features
Page 30 7450 ESS-7
AC P
OWER ENTRY MODULES
Two bays in the rear of the 7450 ESS-7 chassis are designated for swappable, load-sharing power
entry modules (PEM) (Figure 8). One AC PEM and one AC PSM can support the full system
current requirements if you are operating the 7450 ESS-7 without power redundancy. For
redundancy, two AC PEMs and two AC PSMs must be installed and powered on at all times. See
AC Power Supply Modules on page 29.
AC power cables must be compliant with your local safety codes. There are no field replaceable
parts. The entire unit must be replaced in the event of a failure.
The associated LED on the SF/CPM faceplate indicates normal online (green), fault (red), or
offline (not lit) power conditions. A circuit breaker integrated into the AC PEM provides over-
current protection.
Power can be removed with the circuit breaker (ON/OFF) on each AC PEM.
Figure 8: 7450 ESS-7 AC Power Entry Module (PEM)
SR70023
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