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