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| Introduction | |
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Table 1 | Controller board components (continued) |
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Item | Description |
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| One of four output jumpers. Each digital output has a |
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| jumper to set the | 3.2.3: Setting the Digital Output | ||
I - Digital output | power fails. The OFF position makes the contact Normally | ||||
| Jumpers | ||||
Open (factory default). The ON position makes the contact |
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7.6.4: Configure Output for Loss of | |||||
jumper |
| Normally Closed. | |||
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| Power | |||
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| Note: The jumper position has no effect on the contact |
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| when the Liebert AC4 has power. |
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| Each of the four input connections is a | 3.0: | Wiring and Connections | |
J - Digital input | ON/OFF | 3.2.1: Connecting Digital Inputs | |||
connectors | An example of a field digital input is a Liebert | 5.4: | View Input Status | ||
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| Environmental unit’s common alarm relay output. | 7.3: | Setup System - Setup Inputs | |
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K - Digital input | Each input has an LED to indicate its status: ON/OFF | 1.7: | LED Indicators | ||
status LEDs | |||||
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L - Serial interface | Connection for laptop or video terminal. Used for | 3.4: | RS232 Connector | ||
configuration and monitoring using the Service Terminal | |||||
connector |
| A.2: | Connecting to the Service | ||
| Interface. Requires a null modem cable for connectivity | ||||
(RS232/EIA574) |
| Terminal Interface | |||
(P/N 201258P1). |
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M - DIP switch 1 | DIP switch used for resetting password to default. | 7.7.1: Change Password | |||
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N - LCD connector | Connection for the LCD on the enclosure door. | N/A |
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O - LCD contrast | Adjustment contrast for the LCD on the enclosure door. | N/A |
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adjustment |
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P - 24VAC power | Power connection for the controller. Requires 24VAC. | 2.4: | Connect Power to the Liebert | ||
connector |
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| AC4 | ||
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5 | Liebert® AC4™ |