First Virtual Communications 3000 user manual Interpreting the EMU LED Feedback

Voyager 3000 User Guide

Each slave EMU will have the same data available to the Master and Host as is shown in Table 3-4 and Table 3-5. Table 3-6 shows a summary of the status that is monitored by the EMU.

Table 3-6 Devices/events monitored by the EMU

Connection	Status monitored	Method used
FANS	Connected	Loopback circuit.
	Speed OK	Squarewave proportional to speed.
PSU	Connected	Loopback circuit.
	Voltage Good	Valid if both 12V and 5V good
		signals are active. Voltages
		monitored internally by the PSU.
Temperature	Within range	Temperature trip points set in oC by
		EMU circuitry.
SCSI Devices	Connected	Loopback circuit.
	IDs	Read ID settings serially from
		backplane.
Battery Backup or	On Battery Power	Internal and external logic level
UPS	2 Minute reserve	connectors.
	warning

Interpreting the EMU LED Feedback

When a failure occurs an audible alarm will sound from the buzzer and the EMU LED will flash at regular intervals. Table 3-7 shows how to recognize failures.

Table 3-7 Interpreting the EMU LED feedback

No of Flashes	Interpretation
1	Fan One Failure
2	Fan Two Failure
3	Fan Three Failure
4	Fan Four Failure
5	Alarm Temperature
5	Critical Temperature reached or exceeded

If a device failure occurs then the bottom light indicator will display RED indicating which device has failed. If a Power Supply failure occurs then the indicator will display RED.

The Silence Switch is used only to silence the alarm buzzer - it does not stop the error LED from flashing. Multiple failures are shown as multiple sequences of LED flashes, for example if the first two fans fail, then the LED will flash once, followed by two flashes and it will continue to display this sequence.

3-6