DB-9 Connector, Communications | Liebert 1000

Communications

8.0COMMUNICATIONS

8.1DB-9 Connector

The UPS has a DB-9 (9 pin female) connector on the rear to allow UPS status communications with a computer system running MultiLink software. The DB-9 is capable of supplying serial communica- tion, on battery and low battery signals. MultiLink, Liebert’s UPS monitoring and shutdown soft- ware, is shipped with the UPS, along with a 10 ft. (3m) DB-9 cable required for running MultiLink.

When MultiLink is installed on the host computer, the UPS can signal “on battery” and “low battery” using opto-couplers. When the UPS is operating in Battery mode, it can receive a signal from the host computer system that will shut down the UPS (after gracefully shutting down the operating system on the host computer system) when the remaining battery run time is low. The timing of the signal depends on MultiLink’s configuration settings. This shutdown signal (5-12VDC) must have a dura- tion of at least 2 seconds for the UPS to be shut down. The UPS communicates via serial communica- tions using Liebert ESP II protocol.

Table 1 DB-9 pin assignment

DB-9 Pin Assignment Description

1Low Battery (open collector)

2UPS TxD

3UPS RxD

4Battery Mode Shutdown (5-12V)

5Common

6Any Mode Shutdown (short to pin 5)

7Low Battery (open emitter)

8Utility Fail (open emitter)

9Utility Fail (open collector)

Pin Assignment				Collector to Emitter*
6	7	8	9	(+)	Open
				(+)	Collector
				330 Ohms
1 2	3	4	5	(-)	Open
1 2	3	4	5		Emitter

8.2Remote Shutdown Via the DB-9 Connector

The PowerSure PSI can be shut down remotely by shorting Pins 5 and 6 or via Pins 4 and 5 of the DB-9 connector.

8.2.1Any Mode Shutdown—Via Pins 5 & 6

When Pin 6 is shorted to Pin 5, the UPS output is shut Off regardless of what mode the UPS is oper- ating in. The UPS cannot be started as long as the pins are shorted. When the short is removed, the UPS output can be enabled by pressing the ON/Alarm Silence/Battery Test button.

8.2.2Battery Mode Shutdown—Via Pins 4 & 5

While the UPS is operating on battery (with no battery test in progress), a 5-12VDC signal for 2 sec- onds or longer is required to signal a shutdown. Signals for less than 2 seconds are ignored.

After Pin 4 receives the shutdown signal, a 2-minute shutdown timer inside the UPS begins a count- down. The timer cannot be stopped. If utility power returns during the 2-minute timer countdown, the shutdown timer continues until the end of 2 minutes and then the UPS turns Off. By default, autorestart is enabled so the UPS will restart after 10 seconds. If autorestart is disabled via Multi- Link software, the UPS remains Off until a manual restart.

1000 - 3000VA 60 Hz 120V specifications

The Liebert 1000 - 3000VA 60 Hz 120V is an uninterruptible power supply (UPS) designed to protect critical electronic equipment and ensure uninterrupted operation in various settings. Ideal for small to medium-sized businesses, the Liebert UPS offers reliable power protection with its compact and efficient design.

One of the main features of the Liebert 1000 - 3000VA is its advanced battery technology. Equipped with high-performance sealed lead-acid batteries, this UPS ensures long-lasting power backup while requiring minimal maintenance. The smart battery management system intelligently monitors battery health, extending overall battery life while providing precise notifications for replacement, thus optimizing operational efficiency.

Another critical characteristic is its online double-conversion technology. This feature provides consistent and clean power by converting incoming AC power to DC and then back to AC again. This process effectively eliminates any electrical noise or power fluctuations, protecting sensitive electronics from interruptions or damage caused by power surges, spikes, or drops. As a result, workloads can operate without concern for potential power issues.

The Liebert UPS is designed with user-friendliness in mind. Featuring a clear LED display, it allows users to easily monitor performance metrics such as load level, battery health, and runtime status. In addition, the intuitive control panel simplifies operation and navigation through settings, making it accessible to users without extensive technical knowledge.

This UPS also offers flexibility with multiple outlet options. The Liebert 1000 - 3000VA includes a combination of NEMA outlets, providing compatibility with various equipment types, from servers and routers to networking devices and communications equipment. This versatility ensures that it meets diverse power requirements within any environment.

Moreover, the compact form factor enables installation in tight spaces while maintaining robust performance. Its efficient design facilitates heat dissipation, ensuring optimal operation without overheating.

The Liebert 1000 - 3000VA 60 Hz 120V UPS delivers excellent protection for critical equipment across various industries, including telecommunications, healthcare, and finance, ensuring operational continuity. With its advanced features, reliable technologies, and user-centered design, it stands out as a reliable choice for any organization seeking to safeguard its power supply infrastructure.