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Liebert AC4 User Manual

Liebert AC4 User Manual

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Liebert® AC4
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  • Page 1 Liebert® AC4 User Manual...
  • Page 2 Technical Support Site If you encounter any installation or operational issues with your product, check the pertinent section of this manual to see if the issue can be resolved by following outlined procedures. For additional assistance, visit https://www.VertivCo.com/en-us/support/...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS 1 Introduction 1.1 Methods of Viewing and Configuring the Liebert AC4 1.2 Data Logs 1.3 Available Alarms 1.4 Outside Enclosure Overview 1.5 Typical Configuration 1.6 Controller Board Overview 1.7 LED Indicators 1.8 Typical Sequence 2 Installation 2.1 Installation Considerations 2.1.1 Unpacking and Preliminary Inspection...
  • Page 4 7.8.4 Specify Hold Delay Time 7.8.5 Specify Restart Time 7.9 Override Output 7.10 Clear Alarms & Logs 7.10.1 Clear Active Alarms 7.10.2 Clear the Alarm Log 7.10.3 Clear the Event Log 8 Specifications 8.1 Liebert AC4 Specifications Vertiv | Liebert® AC4 User Manual |...
  • Page 5 Appendix A: Service Terminal Interface Vertiv | Liebert® AC4 User Manual |...
  • Page 6 Vertiv | Liebert® AC4 User Manual |...

  • Page 7: Introduction

    The Liebert AC4 is ideal for coordinated control of systems with redundant equipment, such as multiple environmental units or pumps. When the Liebert AC4 controller detects an alarm in an operating device, the Liebert AC4 enables a standby device and controls the device in alarm as configured, either leaving that device operating or disabling it.

  • Page 8: Outside Enclosure Overview

    1.4 Outside Enclosure Overview The Liebert AC4 controller board comes in an enclosure that is 2-3/4" deep and has a built-in liquid crystal display (LCD) and a key lock, as shown in Figure 1.1 below. The enclosure is made of metal to accommodate secure conduit fittings and protect components against environmental debris.

  • Page 9: Typical Configuration

    Figure 1.3 Typical Configuration 1.6 Controller Board Overview The Liebert AC4 controller board has connectors for four digital inputs and four digital outputs, as shown below. The board comes complete with light emitting diodes (LEDs) to display the status of connected devices, a serial communications port, a power connection and other features necessary to control your operation.
  • Page 10 Vertiv | Liebert® AC4 User Manual |...

  • Page 11: Led Indicators

    P - 24VAC power connector Power connection for the controller. Requires 24VAC. page 18 1.7 LED Indicators The Liebert AC4 controller board has LED indicators that show the status of inputs, outputs and the common alarm Vertiv | Liebert® AC4 User Manual |...
  • Page 12 Table 1.2 LED indicators summary LED Type Color Description 422 TX Green Liebert AC4 is transmitting information over the EIA422 port EIA422 LEDs 422 RX Green Liebert AC4 is receiving information over the EIA422 port OUTPUT1 Green Not used OUTPUT2...

  • Page 13: Typical Sequence

    Indicates input 4 is ON or energized 1.8 Typical Sequence Figure 1.4 on the next page shows a typical sequence of how the Liebert AC4 functions after detecting a change in a monitored device. Many responses depend on configuration settings. This example shows what happens when a digital input changes state—assuming the input is defined as alarmable—and...
  • Page 14 Figure 1.4 Example of typical sequence Vertiv | Liebert® AC4 User Manual |...

  • Page 15: Installation

    2.1 Installation Considerations The Liebert AC4 must be installed indoors and may be mounted on the surface of a wall or flush-mounted, depending on the user’s application, the location of equipment to be connected and the type of wall the unit will be mounted on.

  • Page 16: Surface-Mounting The Liebert Ac4

    Mark the wall for mounting holes, using the back of the unit as a template (see Figure 2.1 on the facing page). 2. Drill holes, if required, to install the four #10 screws that will secure the Liebert AC4 to the wall. Clean up the debris.

  • Page 17: Flush-Mounting The Liebert Ac4

    NOTE: The rectangular access doors on the top and bottom of the Liebert AC4 must be reversed so they slide the opposite direction. Leaving the doors as shipped from the factory prevents them from being opened when the panel is flush mounted in a wall.

  • Page 18: Mounting The Panel

    3. Use the saw to cut out the marked section of the wall (if not new construction). 4. Rest the Liebert AC4 in the wall and mark where mounting screws will be inserted into the wall studs or other support member.
  • Page 19 (18 AWG is recommended—see 3 on page 21). Strip wires 1/2". Figure 2.2 Electrical connections to panel 3. Secure the incoming electrical service wires to the Liebert AC4’s 24VAC input by sliding the wires into TB7, the 24VAC input terminal block. There is no polarity requirement when connecting to TB7.
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  • Page 21: Wiring And Connections

    The Power On/Off switch is in the top left corner of the unit. 3.1 Wiring Specifications Input and output connections to the Liebert AC4 may be made in any order—it is not necessary, for example, to make all input connections before making any output connections. Use copper conductors only for all wiring.

  • Page 22: Connecting Digital Inputs And Outputs

    • Input 4 is tied to Output 4 (default name: Device_4) Up to four devices may be connected to the Liebert AC4. Each device must be connected to an input and an output with the same number. To determine the proper wire size, see Wiring and Connections on the previous page.

  • Page 23: Connecting Digital Outputs

    3.2.2 Connecting Digital Outputs The four digital outputs are found on the lower right side of the Liebert AC4 just above the input terminal blocks, as shown at right. These outputs are numbered 1 through 4. To connect an output: Turn OFF electrical power to the Liebert AC4.

  • Page 24: Connecting Common Alarm Outputs

    Turn OFF electrical power to the Liebert AC4. 2. If necessary, remove a conduit knockout to permit wire entry into the Liebert AC4 enclosure. 3. Bring the wire(s) into the Liebert AC4 enclosure through a conduit knockout or access slot.

  • Page 25: Overview Of Menus

    4 OVERVIEW OF MENUS There are two ways to access the Liebert AC4: the LCD on the front of the enclosure and the Service Terminal Interface, which is accessible through any computer using a communications program. Many viewing and configuration tasks can be performed through either interface, but some are available only through the Service Terminal Interface.

  • Page 26: Opening Screen Overview

    4.1 Opening Screen Overview The Liebert AC4 displays the Opening Screen at startup, as shown in Figure 4.1 on the facing page. • If any alarms are active, the Current Alarm screen appears. (Pressing any key on the LCD keypad will silence the audible alarm.)

  • Page 27: Lcd Menu Overview

    Figure 4.1 below shows an overview of the initial screens available through the LCD interface. For comparable information about the Service Terminal Interface screens, see Overview of Menus. Figure 4.1 LCD Menu overview Vertiv | Liebert® AC4 User Manual |...
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  • Page 29: View Status Options

    View Active Alarms • View Alarm Log • View Event Log • View Input Status • View Output Status Figure 5.1 on the next page shows the main options available from the View Status menu. Vertiv | Liebert® AC4 User Manual |...
  • Page 30 Figure 5.1 Menu overview - View Status menu Vertiv | Liebert® AC4 User Manual |...

  • Page 31: View Active Alarms

    Viewing Additional Screens There may be up to 40 records of alarm data. • To view additional records, use the arrows  ¯ • To return to the previous screen, press the ESC key. Vertiv | Liebert® AC4 User Manual |...

  • Page 32: View Alarm Log

    Viewing Additional Screens There may be up to 99 records of alarm data. • To view additional records, use the arrows  ¯ • To return to the previous screen, press the ESC key. Vertiv | Liebert® AC4 User Manual |...

  • Page 33: Backing Up The Alarm Log (Service Terminal Interface Only)

    5.2.2 Backing Up the Alarm Log (Service Terminal Interface only) The alarm log is stored as a file in the Liebert AC4; it can hold no more than 99 records. When the log is full, the oldest records are deleted from the end of the file as new alarm records are added at the beginning.

  • Page 34: Backing Up The Event Log (Service Terminal Interface Only)

    5.3.2 Backing Up the Event Log (Service Terminal Interface only) The event log is stored as a file in the Liebert AC4; it can hold no more than 99 records. When the log is full, the oldest records are deleted from the end of the file as new event records are added at the beginning.

  • Page 35: View Input Status

    All input data may be viewed by scrolling beyond the four lines that appear on the LCD at one time: • To view all inputs, use the arrows  ¯ • To return to the previous screen, press the ESC key. Vertiv | Liebert® AC4 User Manual |...

  • Page 36: View Output Status

    All output data may be viewed by scrolling beyond the four lines that appear on the LCD at one time: • To view all outputs, use the arrows  ¯ • To return to the previous screen, press the ESC key. Vertiv | Liebert® AC4 User Manual |...

  • Page 37: Silence Alarm & Backup Log Files (Service Terminal Interface)

    A confirmation message appears: “Alarm has been silenced.” 6.2 Back Up Log Files (Service Terminal Interface only) The Liebert AC4 maintains two types of logs—alarm and event—that may be backed up to a remote computer. This feature is available only through the Service Terminal Interface.
  • Page 38 Connect to the Liebert AC4 through the RS232 port (see Connecting to the Service Terminal Interface on page 70). 2. At the Main Menu, enter 7 (Backup Log Files). 3. At the Backup Log Files menu, as shown below, enter a number for the type of file you want to back up: •...
  • Page 39 (return to Step3. on the previous page) or press 3 (or Escape) to return to the Main Menu. After backing up a log file, you may want to delete all records in the Liebert AC4 log of that type. See Clear Alarms & Logs for details.
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  • Page 41: System And Control Options

    This menu also provides a vehicle for manually changing the state of an output to ON or OFF, clearing active alarms and deleting records from the Liebert AC4’s alarm and event logs.
  • Page 42 • Clear Alarms & Logs) Figure 7.1 on the facing page shows the main options available from the System & Control menu. Vertiv | Liebert® AC4 User Manual |...
  • Page 43 Figure 7.1 Menu overview - System and Control menu Vertiv | Liebert® AC4 User Manual |...

  • Page 44: Setup System - Overview

    Unlatched. • You may also specify a time delay before the Liebert AC4 responds to an alarm or event. Use the steps following Table 7.2 on the facing page to change the default settings for any digital input. Vertiv | Liebert® AC4 User Manual |...

  • Page 45: Change Label (Name Of Input)

    From the Setup Inputs Menu, choose Label for the selected input—Label: Device_1 in the example at right—and press Enter. • To change the input’s label, which may consist of up to eight characters: Vertiv | Liebert® AC4 User Manual |...

  • Page 46: Define Input As Normally Open Or Normally Closed

    From the Setup Inputs Menu, choose Alarm/Event, as shown at right, and press Enter. • To change the type of input, use the arrows to choose AL (Alarmable) or EV (Event), then press Enter. Vertiv | Liebert® AC4 User Manual |...

  • Page 47: Set Up Alarmable Inputs In Latched Or Unlatched Mode

    7.3.4 Set Up Alarmable Inputs in Latched or Unlatched Mode Alarmable input points may be set up in Latched mode (Y), which requires the user to clear the Liebert AC4 alarms after an alarm has occurred, or Unlatched mode (N), in which alarms will automatically clear after a return- to-normal state.

  • Page 48: Setup System - Setup Common Alarm

    When finished, press Enter again. 7.4 Setup System - Setup Common Alarm The audible alarm sounds after the Liebert AC4 detects an alarm condition in any input that has been defined as alarmable. Once the alarm is silenced, there are two options: •...

  • Page 49: Set Up A Zone

    Press Escape to return to the Setup Zones menu. Table 7.5 on the next page shows the possible combinations of outputs for each zone. For example, if Zone 1 has four outputs, then Zone 2 may not be used (0 outputs). Vertiv | Liebert® AC4 User Manual |...

  • Page 50: Setup System - Setup Outputs

    2 or 3 or 4 outputs 7.6 Setup System - Setup Outputs The Liebert AC4 has four outputs that may be configured individually. These outputs correspond to the four numbered inputs. For example, Device_1 is the unit connected to Input 1 and to Output 1.

  • Page 51: Define Output As Normally Open Or Normally Closed

    Enter. • To make a change, use the arrows to choose E (Enable) or D (Disable) to determine what happens when an alarm is detected in the device. • Press Enter. Vertiv | Liebert® AC4 User Manual |...

  • Page 52: Configure Output For Loss Of Power ("Fail-Safe")

    • Change Password—used for access to system setup functions • Set Date & Time/Automatic Daylight Saving Time—used to set the Liebert AC4 date and time and to enable automatic time change for Daylight Saving Time • Setup Site ID—the Liebert AC4’s location to differentiate among sites if more than one Liebert AC4 is in use •...

  • Page 53: Change Password

    7.7.2 Set Date & Time/Automatic Daylight Saving Time The Liebert AC4 has a built-in real-time clock that is backed up by an encapsulated lithium battery and set up to adjust automatically for daylight saving time twice a year. The Setup System Info menu allows you to set the current date or time or change the automatic adjustment at any time.

  • Page 54: Setup Site Id

    This operation may be performed only through the Service Terminal Interface. It permits the user to make a copy of the Liebert AC4 configuration settings and save it as a file on the computer connected through the RS232 port. Should the need arise, the user can upload the configuration file from the computer to the Liebert AC4, instead of re-entering the settings manually.
  • Page 55 5=RETURN TO MAIN MENU SELECT A NUMBER:1 6. Enter 1 to back up the configuration file from the Liebert AC4 to the computer and proceed to Step 1. below, 7. Enter 2 to upload the configuration file from the computer to the Liebert AC4 and proceed to Step 1.
  • Page 56 NOTE: The following instructions refer to the Microsoft Windows HyperTerminal program. These steps may vary for other communications programs. 3. At the top of the HyperTerminal window, shown below, click on Transfer, then on Send File. Vertiv | Liebert® AC4 User Manual |...

  • Page 57: Factory Defaults

    7.7.6 Perform Firmware Update (Service Terminal Interface only) This function, which may be performed only through the Service Terminal Interface, upgrades the Liebert AC4’s firmware to the newest version. NOTE: This action will overwrite any configuration settings. You may want to back up your settings before restoring the factory defaults.
  • Page 58 • Connect to the Liebert AC4 either from a remote computer or through the RS232 port (see Connecting to the Service Terminal Interface on page 70). • At the Main Menu, enter 0 (zero—Setup System-Login Required). • At the Login Menu, enter your password.
  • Page 59 Click on the Send button. (To close the window without sending the file, click on Close or • Cancel.) When the transfer is complete, a confirmation message—“Firmware Update Successful”— • appears in the Service Terminal Interface window and the Liebert AC4 reboots with the new firmware update. Vertiv | Liebert® AC4 User Manual |...

  • Page 60: Setup Operation

    7.8 Setup Operation The Liebert AC4 operation features allow you to set up a rotation sequence to alternate which devices are operating and which are placed on Standby, as well as test devices while in Standby mode and specify what to do when a Standby device goes into alarm as it is powered up. You may also specify delay times after an output changes state, directing the Liebert AC4 to wait before acknowledging inputs or turning an output on or off.

  • Page 61: Turn Standby Testing On Or Off

    When more than one device is in Standby mode or turned On, the Liebert AC4 performs the operations in a sequence that rotates the order. For example, in a sequence set up to occur every two days: • Monday: Device 1 is placed on Standby, and Devices 2, 3 and 4 operate.
  • Page 62 Specify the duration of the test in minutes—the length of time the standby units will be turned On—in the For 10 Min field. Use the arrows to choose a number from 0 to 59 minutes. The default is 10 minutes. • When finished, press Enter. Vertiv | Liebert® AC4 User Manual |...

  • Page 63: Specify Failed Standby Response

    Liebert AC4 detects a closed contact that is defined as Normally Open. When the output device returns to its normal state, the Liebert AC4 acknowledges any input change of state immediately. Vertiv | Liebert® AC4 User Manual |...

  • Page 64: Specify Restart Time

    The hold delay timer also takes effect when the Liebert AC4 is powered up. All alarms are ignored until the hold delay time expires. • From the Setup Operation Menu, choose Hold Delay, as shown at right, and press Enter.
  • Page 65 From the Override Output menu, use the arrows to choose one of these options: • AUTO - return to automatic control • FORCE ON - manually turn this output ON (operating) • FORCE OFF - manually turn this output OFF • Press Enter. Vertiv | Liebert® AC4 User Manual |...

  • Page 66: Clear Alarms & Logs

    Enter. 7.10.3 Clear the Event Log The event log contains up to 99 records of events detected by the Liebert AC4. You may want to clear the log after backing up the file or simply to free up space.

  • Page 67: Specifications

    Agency Listings UL3121 FCC Compliance CFR 47 Part 15 Inputs & Outputs (Quantity) Dry Contact Closure Digital Inputs (4) 24VDC, 10 mA Digital Outputs (4) 24VAC, 3A Common Alarm Outputs (2) 24VAC, 3A NOTES Vertiv | Liebert® AC4 User Manual |...
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  • Page 69 Appendix A: Service Terminal Interface The Service Terminal Interface allows access to all functions of the Liebert AC4, including some that are not possible through the LCD interface. This interface is accessible through any computer using a communications program such as Microsoft® Windows® HyperTerminal.
  • Page 70 This section describes how to set up and connect to the Service Terminal Interface. To access the Service Terminal Interface, you will need: • A null modem cable to connect a computer’s COM1 port to the Liebert AC4’s RS232 port. • A communications program, such as HyperTerminal, to connect to the Service Terminal Interface.
  • Page 71 3. In the Connection Description window, shown above right, enter a name for the connection— for example, AC4. This becomes the file name (with the extension “.ht”). 4. Click OK to close the window. The Connect To window opens, as shown at right.
  • Page 72 11. In the Properties window, click on the ASCII Setup button, shown below left. 12. In the ASCII Setup window, shown above right, choose the following settings: ) in the Send Line Ends With Line Feeds box. • ASCII Sending: place a check mark ( Vertiv | Liebert® AC4 User Manual |...
  • Page 73 A.3 Overview of Menus The Main Menu offers choices for viewing the status of the Liebert AC4, silencing the audible alarm and backing up the unit’s log files. It also allows access to the System and Control features, which require a password.
  • Page 74 Silence Alarm—silence the Liebert AC4’s audible alarm and reset the Common Alarm Relay output. • Backup Log Files—make backup copies of the Liebert AC4’s Alarm Log and Event Log and save the copies to a computer. Setup Menu Overview The Setup Menu options require a password. Authorized users may: •...
  • Page 75 DEVICE_1 ALARM CONTACT CLOSED 1=REFRESH ACTIVE ALARMS 2=RETURN TO MAIN MENU SELECT A NUMBER: View Alarm Log For details on this feature, see View Alarm Log on page 32. Vertiv | Liebert® AC4 User Manual |...
  • Page 76 <ENTER>=MORE <ESC>=EXIT <A>=ALL DEVICE_2 ALARM CONTACT CLOSED 28-AUG-02 09:29:10 1=REFRESH ALARM LOG 2=RETURN TO MAIN MENU SELECT A NUMBER: View Event Log For details on this feature, see View Event Log on page 33. Vertiv | Liebert® AC4 User Manual |...
  • Page 77 06-MAY-02 07:10:10 DEVICE_4 FORCE OFF CONTACT CLOSED 07-MAY-02 06:20:10 1=REFRESH EVENT LOG 2=RETURN TO MAIN MENU SELECT A NUMBER: View Input Status For details on this feature, see View Input Status on page 35. Vertiv | Liebert® AC4 User Manual |...
  • Page 78 SELECT A NUMBER: A.5 Silence Alarm & Back Up Log Files (Service Terminal Interface only) This section presents two options from the Main Menu that are available via the Service Terminal Interface only. Vertiv | Liebert® AC4 User Manual |...
  • Page 79 2=RETURN TO MAIN MENU SELECT A NUMBER:1 >ALARM HAS BEEN SILENCED Back Up Log Files (Service Terminal Interface only) For details on this feature, see Back Up Log Files (Service Terminal Interface only) on page 37. Vertiv | Liebert® AC4 User Manual |...
  • Page 80 - SELECT TRANSFER FROM THE TOOLBAR - SELECT RECEIVE FILE - ENTER FOLDER WHERE FILE IS TO BE RECEIVED - SELECT XMODEM FROM THE PROTOCOL BOX - SELECT RECEIVE BUTTON AND ENTER FILE NAME, E.G., ALARM.LOG >BACKUP SUCCESSFUL Vertiv | Liebert® AC4 User Manual |...
  • Page 81 >BACKUP SUCCESSFUL A.6 Setup Menu The Setup menu allows the user to configure the Liebert AC4—setting up inputs, outputs and system features such as date and time, as well as operation options such as a rotation sequence and standy testing. This menu also provides a vehicle for manually changing the state of an output to ON or OFF, clearing active alarms and deleting records from the Liebert AC4’s alarm and event logs.
  • Page 82 >PRESS <ESC> TO EXIT > • Enter the password, and the Setup Menu appears, as shown in the following section. Setup Menu This section presents Service Terminal Interface screens for each of the following: Vertiv | Liebert® AC4 User Manual |...
  • Page 83 To change the current setting, enter the value and then press Enter. • Pressing Escape will exit the current setup function or take you to the previous menu screen. Setup Inputs For details on this feature, see Setup System - Setup Inputs on page 44. Vertiv | Liebert® AC4 User Manual |...
  • Page 84 >IS INPUT NORMALLY OPENED(NO) OR NORMALLY CLOSED(NC)? >[NO] >[ >COMMAND SUCCESSFUL >IS INPUT AN ALARM(AL) OR EVENT(EV)? >[AL] >[ >COMMAND SUCCESSFUL >IS ALARM LATCHED-YES(Y) OR NO(N)? >[N] >[ >COMMAND SUCCESSFUL >DELAY TIME BEFORE TRIGGER (MM:SS)? >[00:01] >[ >COMMAND SUCCESSFUL Vertiv | Liebert® AC4 User Manual |...
  • Page 85 Select zones and number of devices in the zone   ZONE    # DEVICES 1=ZONE 1      2 2=ZONE 2      2 3=RETURN TO SETUP MENU 4=RETURN TO MAIN MENU SELECT A NUMBER:1 ># DEVICES IN ZONE 1 >[2] >[ >COMMAND SUCCESSFUL Vertiv | Liebert® AC4 User Manual |...
  • Page 86 This section presents Service Terminal Interface screens for choices 1 through 9 in the Setup System Information menu shown below. For details on this topic, see Setup System - Setup System Info page 52. Vertiv | Liebert® AC4 User Manual |...
  • Page 87 >ENTER ORIGINAL PASSWORD(MUST BE 4 CHARACTERS). > >ENTER NEW PASSWORD(MUST BE 4 CHARACTERS). > >ENTER NEW PASSWORD AGAIN FOR CONFIRMATION. > >PASSWORD CHANGE SUCCESSFUL Setup Site ID For details on this feature, see Setup Site ID on page 54. Vertiv | Liebert® AC4 User Manual |...
  • Page 88 >ENTER SITE ID NAME(40 CHARACTERS MAX). >[] >[ >COMMAND SUCCESSFUL Backup and Upload Configuration File (Service Terminal Interface only) For details on this feature, see Backup and Upload Configuration File (Service Terminal Interface only)  page 54. Vertiv | Liebert® AC4 User Manual |...
  • Page 89 - SELECT TRANSFER FROM THE TOOLBAR - SELECT RECEIVE FILE - ENTER FOLDER WHERE FILE IS TO BE RECEIVED - SELECT XMODEM FROM THE PROTOCOL BOX - SELECT RECEIVE BUTTON AND ENTER FILE NAME,,E.G., AC4_CONF.SAV >BACKUP SUCCESSFUL Vertiv | Liebert® AC4 User Manual |...
  • Page 90 - ENTER FILE NAME-CONFIGURATION FILE LOCATION & NAME,E.G., AC4_CONF.SAV - SELECT XMODEM FROM THE PROTOCOL BOX - SELECT SEND BUTTON >UPLOAD SUCCESSFUL Factory Defaults For details on this feature, see Factory Defaults on page 57. Vertiv | Liebert® AC4 User Manual |...
  • Page 91 SELECT A NUMBER:1 >RESTORE THE PANEL TO FACTORY SETTINGS-YES(Y) OR NO(N)? >[N] >COMMAND SUCCESSFUL Firmware Update (Service Terminal Interface only) For details on this feature, see Perform Firmware Update (Service Terminal Interface only) on page 57. Vertiv | Liebert® AC4 User Manual |...
  • Page 92 >WAITING TO SEND FLASH FILE >DONE >FIRMWARE UPDATE SUCCESSFUL Setup Operation For details on this feature, see Setup Operation on page 60. Auto Sequencing For details on this feature, see Turn Automatic Sequencing On or Off on page 60. Vertiv | Liebert® AC4 User Manual |...
  • Page 93 >EVERY ## DAYS (.5 FOR 12 HOUR) >[03] DAYS >[ >COMMAND SUCCESSFUL >AT >[00:00] >[ >COMMAND SUCCESSFUL Standby Testing For details on this feature, see Turn Standby Testing On or Off on page 61. Vertiv | Liebert® AC4 User Manual |...
  • Page 94 >EVERY ## DAYS >[03] DAYS >[ >COMMAND SUCCESSFUL >AT >[00:00] >[ >COMMAND SUCCESSFUL >FOR >[10] MIN >[ >COMMAND SUCCESSFUL Failed Standby For details on this feature, see Specify Failed Standby Response on page 63. Vertiv | Liebert® AC4 User Manual |...
  • Page 95 5=RESTART DELAY        00:06 6=RETURN TO SETUP MENU 7=RETURN TO MAIN MENU SELECT A NUMBER:4 >HOLD DELAY (MM:SS) >[10:00] >[ >COMMAND SUCCESSFUL Restart Delay For details on this feature, see Specify Restart Time on page 64. Vertiv | Liebert® AC4 User Manual |...
  • Page 96 3=DEVICE_3    FORCE ON      FORCE ON = FORCE ON BY OPERATOR 4=DEVICE_4    FORCE ON      FORCE OFF= FORCE OFF BY OPERATOR 5=RETURN TO SETUP MENU      ******************************** 6=RETURN TO MAIN MENU SELECT A NUMBER:1 >OVERRIDE OUTPUT DEVICE_1-AUTO(2),FORCE ON(1),FORCE OFF(0). >[2] >[ >COMMAND SUCCESSFUL Vertiv | Liebert® AC4 User Manual |...
  • Page 97 5=RETURN TO MAIN MENU SELECT A NUMBER:1 >CLEAR ALL THE ACTIVE ALARMS-YES(Y) OR NO(N)? >[N] >[ >COMMAND SUCCESSFUL Clear the Alarm Log For details on this feature, see Clear the Alarm Log on page 66. Vertiv | Liebert® AC4 User Manual |...
  • Page 98 1=CLEAR ACTIVE ALARMS 2=CLEAR ALARM LOG 3=CLEAR EVENT LOG 4=RETURN TO SETUP MENU 5=RETURN TO MAIN MENU SELECT A NUMBER:3 >CLEAR ALL RECORDS IN THE EVENT LOG-YES(Y) OR NO(N)? >[N] >[ >COMMAND SUCCESSFUL Notes Vertiv | Liebert® AC4 User Manual |...
  • Page 100 VertivCo.com | Vertiv Headquarters, 1050 Dearborn Drive, Columbus, OH, 43085, USA © 2017 Vertiv Co. All rights reserved. Vertiv and the Vertiv logo are trademarks or registered trademarks of Vertiv Co. All other names and logos referred to are trade names, trademarks or registered trademarks of their respective owners. While every precaution has been taken to ensure accuracy and completeness herein, Vertiv Co.

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