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
Table 1.2 LED indicators summary
Vertiv | Liebert® AC4 User Manual | 12
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