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Power Supply module LED
states
ECO8000 Series Automatic Changeover Unit User Manual
When the instrument is running, the power supply LEDs indicate the status of
the supplies, including the internal fans and which of the supplies is currently
powering the instrument.
If the instrument loses power from both supplies, the LEDs continue to provide
status to help troubleshoot the root of the problem. In this mode, the LEDs flash
to conserve the power in the storage capacitor. Typically the LED flashing should
last for 10 minutes after the loss of power.
If both of the supplies are good, the system will use the supply that is configured
to be the preferred (active) supply. If one power supply has a problem, the system
will switch to the other supply. If either supply can support the instrument load,
even if it has a non-fatal problem, the system will choose the best supply and
attempt to continue to operate.
The following table shows the states of the AC and DC LEDs on a Power Supply
module when the power is on.
Table 10: Power on LED states for a Power Supply module
Power Supply state
Normal, Active
Normal, Backup
AC < 75 V, DC supply running
AC < 75 V, DC supply failed
AC OK, DC supply failed
Marginal Low or High DC, Active
Marginal Low or High DC, Backup
Load Test Fail - Backup
Load Test Fail – Active
Fan Fail - Active
Fan Fail - Backup
Supply not installed, AC present
Supply not installed, AC absent
Operating Basics
AC LED state
DC LED state
Green
Green
Green
Dim Green
Red
Green
Red
Red
Red
Green
Orange
Yellow
Red
Orange
Orange
Red
Green
Off
Off
Off
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