ADTRAN 550 Alarm Relay Connection, External Alarm Relay Monitor Connection, Pin Name Description

Chapter 2. Installation

Alarm Relay Connection

This connection alerts the user when a selected alarm condition exists. The four-pin, removable terminal block connects with external wiring. To make the appropriate connections, remove the block, connect wiring as needed, and return the terminal block to the connector socket. Clear the alarm con- dition by pressing the Alarm Cut-Off (ACO) switch located on the font panel of the ATLAS 550.

After the appropriate connections have been made, tighten the screws using a flathead screwdriver before reinserting the terminal block into the rear panel of the ATLAS 550.

Table 2-4 shows the pinout for the Alarm Relay connector.

		Table 2-4. Alarm Relay Connector Pinout
Pin	Name		Description
1	Normally Closed (NC)		Opens when a selected alarm condition
			is present.
2	Normally Open (NO)		Closes when a selected alarm condition
			is present.
3	Common (COM)		Common connection between external
			circuitry and NC or NO terminal.
4	Chassis Ground (GND)

External Alarm Relay Monitor Connection

This connection alerts the user when a selected external alarm condition ex- ists. This connection could be used to monitor a UPS with dry contacts or an- other ATLAS 550. The two-pin, removable terminal block connects with external wiring. To make the appropriate connections, remove the block, connect wiring as needed, and return the terminal block to the connector socket. Clear the alarm condition by pressing the ACO switch located on the front panel of the ATLAS 550.

After the appropriate connections have been made, tighten the screws using a flathead screwdriver before reinserting the terminal block into the rear panel of the ATLAS 550.

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