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Emerson AC4 User Manual

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Introduction
Liebert
®
 AC4
™
6
1.7
LED Indicators
The Liebert AC4 controller board has LED indicators that show the status of inputs, outputs and the 
common alarm
Table 2
LED indicators summary
LED Type
LED
Color
Description
EIA422 
LEDs
422 TX
Green
Liebert AC4 is transmitting information over the EIA422 port
422 RX
Green
Liebert AC4 is receiving information over the EIA422 port
Output LEDs
OUTPUT1
Green
Not used
OUTPUT2
Green
Not used
OUTPUT3
Green
Not used
OUTPUT4
Green
Not used
OUTPUT5
Green
Indicates output 1 is ON or energized
OUTPUT6
Green
Indicates output 2 is ON or energized
OUTPUT7
Green
Indicates output 3 is ON or energized
OUTPUT8
Green
Indicates output 4 is ON or energized
CTRLLOCK
N/A
Not used
SENLOCK
N/A
Not used
CMN ALR
Green
Indicates output is ON or energized
Status LEDs
MOP
Green
Indicates the microprocessor is operating properly (MOP)—must be on before 
Liebert AC4 will function
FPROG
Green
Indicates firmware is being upgraded—lights up during upgrade process
574 TX or 232 TX
Green
Liebert AC4 is transmitting information via the RS232 port
574 RX or 232 RX
Green
Liebert AC4 is receiving information via the RS232 port
485 RX
Green
Not used
485 TX
Green
Not used
Input LEDs
INPUT1
Red
Not used
INPUT2
Red
Not used
INPUT3
Red
Not used
INPUT4
Red
Not used
INPUT5
Red
Indicates input 1 is ON or energized
INPUT6
Red
Indicates input 2 is ON or energized
INPUT7
Red
Indicates input 3 is ON or energized
INPUT8
Red
Indicates input 4 is ON or energized
OUTPUT1
DS56
DS54
DS63
DS61
DS60
DS62
DS55
DS57
DS59
DS58
DS53
DS52
MOP
F PROG
574 TX
574 RX
485 RX
485 TX
DS51
DS48
DS47
DS78
DS79
OUTPUT2
OUTPUT3
OUTPUT4
OUTPUT5
OUTPUT6
OUTPUT7
OUTPUT8
CTRLLOCK
SENLOCK
CMN ALR
INPUT1
DS69
DS71
DS72
DS70
DS67
DS66
DS65
DS64
INPUT2
INPUT3
INPUT4
INPUT5
INPUT6
INPUT7
INPUT8
Output LEDs
Status LEDs
Input LEDs