Liebert AC4 user manual Specify Hold Delay Time, Specify Restart Time, Setup Operation Menu

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System and Control Options

7.8.4 Specify Hold Delay Time

Setup Operation Menu

 

After an output changes state, the hold delay timer directs the AC4 to ignore all inputs in the same zone for the specified time.

This delay is the amount of time that must elapse before the AC4 acknowledges a change of state in any input. The default is 10 minutes (displayed as 10 MIN : 00 SEC).

The time delay applies only when a monitored output device changes from its normal state—for example, the AC4 detects a closed contact that is defined as Normally Open.

When the output device returns to its normal state, the AC4 acknowl- edges any input change of state immediately.

The hold delay timer also takes effect when the AC4 is powered up. All alarms are ignored until the hold delay time expires.

AUTO SEQUENCING OFF STANDBY TESTING OFF FAILED STANDBY N ↑↓ =NEXT ↵ =SELECT

> HOLD DELAY : 10:00

RESTART

: 00:06

Hold Delay Time

HOLD DELAY

10 MIN : 00 SEC ↑↓ =NEXT ↵ =EDIT

•From the Setup Operation Menu, choose Hold Delay, as shown at right, and press Enter ↵ .

•To change the time delay in minutes and seconds (in the range of 00:00 to 99:59):

•For minutes (MIN), press and hold one of the arrow keys ↑↓

•Press Enter ↵ to advance to seconds (SEC).

•For seconds (SEC), press and hold one of the arrow keys ↑↓

•When finished, press Enter ↵ again.

7.8.5Specify Restart Time

scroll through the numbers 00-99.

scroll through the numbers 00-59.

Setup Operation Menu

The restart delay timer directs the AC4 to wait a specified time before

 

 

 

 

AUTO SEQUENCING OFF

changing the state of an output. This feature can prevent needless

 

STANDBY TESTING OFF

responses to transient conditions.

 

FAILED STANDBY N

If two or more outputs change state simultaneously, the AC4 begins a

 

↑↓ =NEXT

↵

=SELECT

 

HOLD DELAY

: 10:00

 

new countdown between each output change of state.

> RESTART

 

: 00:06

 

The default is 6 seconds (displayed as 00 MIN : 06 SEC).

• From the Setup Operation Menu, choose Restart, as shown at

Restart Delay Time

RESTART DELAY

right, and press Enter ↵ .

00

MIN : 06 SEC

• To change the time delay in minutes and seconds (in the range of

↑↓

=NEXT ↵ =EDIT

00:00 to 99:59):

 

• For minutes (MIN), press and hold one of the arrow keys ↑↓

 

 

scroll through the numbers 00-99.

 

 

• Press Enter ↵

to advance to seconds (SEC).

 

 

• For seconds (SEC), press and hold one of the arrow keys ↑↓ scroll through the numbers 00-59.

• When finished, press Enter ↵ again.

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Contents Monitoring AC4Page Table of Contents Setup System Setup Common Alarm 7.5 Setup System Setup Zones Setup Menu Appendix a Service Terminal InterfaceFigures Introduction Methods of Viewing and Configuring the AC4Available Alarms Data LogsLCD for configuration Outside Enclosure OverviewOperation Typical Configuration Device Liebert ChallengerDevice RS232 Liebert Himod Controller board components Controller Board Overview24VAC power Connector RS232DIP switch LCD connectorLED Indicators LED indicators summaryOutput LEDs Status LEDs Input LEDs Typical Sequence Unpacking and Preliminary Inspection Installation ConsiderationsInstallation Packing ContentsSurface-Mounting the AC4 Required toolsMounting the Panel Flush-Mounting the AC4 Electrical connections to panel Connect Power to the AC4Wiring Specifications Wiring and ConnectionsWiring specifications Connecting Digital Outputs Connecting Digital Inputs and OutputsConnecting Liebert Environmental Units Connecting Digital InputsDigital output jumper settings Connecting Common Alarm OutputsRS232 Connector Setting the Digital Output JumpersGuide to AC4 functions Overview of MenusOpening Screen Overview Main Menu OverviewLCD Menu Overview View Status Options Active Alarms View Active AlarmsActive Alarms Clearing Active AlarmsAlarm Log View Alarm LogAlarm Log Alarm log conditionsEvent Log View Event LogEvent Log Event log conditionsDigital input states View Input StatusInput Status Viewing Additional Input DataDigital output states View Output StatusOutput Status Viewing Additional Output DataSilence Alarm Service Terminal Interface only Silence Alarm & Backup LOG Files Service Terminal InterfaceBack Up Log Files Service Terminal Interface only Silence Alarm & Backup Log Files Service Terminal Interface Valid characters for data entry LoginLogin System and Control OptionsClear Alarms/Logs menu Login ScreenSystem & Control menu Clear Alarms&Logs selected Setup System menuSetup System Setup Inputs Setup System OverviewDefine Input as Alarmable or Event Change Label Name of InputDefine Input as Normally Open or Normally Closed Latched / Unlatched Set Up Alarmable Inputs in Latched or Unlatched ModeSet Up Delay Time Delay TimeSetup System Setup Common Alarm Change to Reset Y or Not Reset NReset Common Alarm Message if too many devices entered Setup System Setup ZonesSet Up a Zone Message if too few devices enteredDefine Output as Normally Open or Normally Closed Setup System Setup OutputsSet Mode Define Operating or Standby ModeEnable or Disable an Output Device in Alarm Status Configure Output for Loss of Power Fail-SafeReset Password to the Factory Default Aaaa Setup System Setup System InfoChange Password Change the PasswordSet Date & Time Setup Site IDSetup Site ID Set Date & Time/Automatic Daylight Saving TimeBackup and Upload Configuration File Back Up the Configuration File Upload the Configuration File Factory Defaults Factory DefaultsFirmware Update Service Terminal Interface only System and Control Options Default settings operation features Setup OperationSelect Setup Operation Setup System Menu Setup Operation MenuSet Start Time Hour Interval Turn Automatic Sequencing On or OffActivate / Deactivate Set Interval & Start Time 1- to 99-Day IntervalFailed Standby response Turn Standby Testing On or OffChange Standby Testing Specify Failed Standby ResponseRestart Delay Time Specify Hold Delay TimeHold Delay Time Setup Operation MenuOverride Output Clear the Event Log Clear Alarms & LogsClear Active Alarms Clear the Alarm LogSpecifications AC4 SpecificationsComparison of Functions LCD and Service Terminal Interface Appendix a Service Terminal InterfaceConnecting to the Service Terminal Interface COM1 Port Setup Create a ConnectionSpecify COM Port Connection Ascii Setup button Properties SetupAscii Setup Settings tabClick on the file name for example, AC4.ht Connect to the Service Terminal InterfaceMain Menu For sample screens, see Silence Alarm and Backup Log FilesSetup Menu Overview View Status OverviewView Status Menus Main MenuMain Menu View Active Alarms View Active AlarmsView Alarm Log View Alarm LogView Event Log View Event LogView Input Status View Input StatusView Output Status View Output StatusSection A.5.1 Section A.5.2 Silence AlarmBack Up Event Log File Back Up Alarm Log FileBackup Log Files Alarm Log File Backup Log Files Event Log FileSetup Menu Login MenuLogin See Description Setup MenuSetup Menu Tips on Using the Service Terminal InterfaceSetup Inputs Setup InputsSetup Common Alarm Setup Common AlarmSetup Zones Setup ZonesSetup Outputs Setup OutputsSetup System Info Setup System InfoChange Password Set Date & Time Setup Site IDBackup & Upload Configuration File Backup Factory Defaults Backup & Upload Configuration File UploadFirmware Update Firmware Update Service Terminal Interface onlySetup Operation Setup Operation Auto SequencingAuto Sequencing Setup Operation Standby Testing Standby TestingFailed Standby Hold DelaySetup Operation Failed Standby Setup Operation Hold DelaySetup Operation Restart Delay Restart DelayOverride Output Override OutputClear Alarms & Logs Clear Alarms & Logs Clear Active AlarmsClear Alarms & Logs Clear the Alarm Log Clear Alarms & Logs Clear the Event Log Page Asia 23F, Allied Kajima Bldg Technical Support/ServiceCompany Behind the Products Locations
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AC4 specifications

The Liebert AC4 is a highly advanced cooling solution designed for critical environments, such as data centers and telecommunications facilities. As data demands rise and IT equipment generates significant heat, an effective cooling system is paramount to maintaining optimal performance and reliability. The Liebert AC4 stands out in this space, offering a blend of efficiency, flexibility, and innovative technology.

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