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The second bank of LEDs indicates communication status and internal processor board
diagnostic status. This bank of LEDs also form binary error codes. These are used by ADB
Airfield Solutions to determine board level problems. Table 4 summarizes the function of the
Processor Board LEDs and enumerates the function of the Lamps-Out Board LEDs listed in
Table 5.
7. Every time the
ACE2 resets
when using
ALCMS Step
setting drops to
step 0.
If ACE2 was
configured for
Stand-Alone, and
was used in ALCMS
mode, upon reset
the ACE2 attempts
to go passive. The
Regulator begins to
operate at Step 0.
Call ADB Airfield Solutions, for assistance.
8. Incorrect
voltageand/or
current reading
occurs on the
ACE2 front panel
display.
No power.
Fiber optic cable not
connected.
Check the Current Voltage Monitor (CVM) power
source.
Check the fiber optic connection from the Lamps-Out
Board to the CVM.
9. Low VA
displayed on LCD
panel and all
CCR steps.
CCR shorted
Part of field load is
shorted or not
operating.
CCR output may be shorted. Remove the short from
the CCR output.
The most common reason for this is an alteration of
the field. If this is the case recalibrate the load using
the Lamps-Out Calibration. If that is not the problem
check the field circuit completely and correct any
problems.
10. Periodic IRMS
megging is not
being performed
No power.
Fiber optic cable not
connected.
IRMS configuration
not set properly.
Verify the IRMS has power.
Check the fiber optic connection from the IRMS to
the ACE2 processor board.
Verify the IRMS date, time, and period are set
correctly.
Table 5:
Processor Board LED Description
Circuit
Board Label
LED Description
Normal Working Operation
D1
Processor board Power
Always On
D7
Flashing Interval Indicates CPU Load Flashing
D8
CPU Running Indication
Flashing
D9
Not Used
Off
D10
Lamps-Out Monitoring or IRMS
Communication Transmitting
Flashing if LOM or IRMS is Installed
D11
Lamps-Out Monitoring or IRMS
Communication Transmitting
Flashing if LOM or IRMS is Installed
and Responds
D12
RS232 Communication Port Status
Flashing if there is Communication
D13
Channel B Communications Port
Status
Flashing if there is Communication
D15
Channel A Communications Port
Status
Flashing if there is Communication
Table 4:
Troubleshooting Chart