NEC D3/D4 Quick Start Guide 6
Controller Status LEDs
There are three status LEDs on each controller that include, from left to right, a Backup LED, a Fault LED,
and a Ready LED. The Backup LED will only blink to indicate that the battery backup is currently powering
the unit. The Ready and Fault LEDs use the following signal combinations to indicate controller status.
Ready LED Fault LED Status
Blinking OFF
Normal operating condition
ON OFF Startup sequence in progress
Rapid Blinking OFF Shutdown sequence in progress
Asynchronous Blinking Online/automatic download sequence in progress
Synchronized Blinking In download mode
ON ON Fault condition exists
ON Blinking Waiting for disk enclosure power-on
Blinking ON Disk interface is disabled
OFF OFF Powered off
Table 5. Controller Ready LED and Fault LED Status Conditions
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