Emerson iCOM user manual Standby Rotation Typical Standby Lead/Lag Function, Standby and Cascade

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Teamwork

4.1.4Teamwork Mode 2

Teamwork Mode 2 is designed to prevent units within a group from working against each other or “fighting.” It is best applied in large rooms with unbalanced heat loads. In Teamwork Mode 2, all parameters are shared equal to Mode 1, and Unit #1 averages all of the available unit sensor readings on the network to define whether there is a cooling, heating, dehumidification or humidification request.

If there is a cooling request, all units are released to start cooling resources according to their own temperature readings; heating is disabled for all units – and vice versa. Same for humidity control.

If the network average would ask for 0% proportional band, the most demanding request (highest or lowest temperature of all units, highest or lowest humidity of all units) would be used to define the operation to be performed.

Teamwork Mode 2 does not rotate – unevenly distributed working hours to be expected. Autoset will not adjust the proportional band.

NOTE

In Teamwork Mode 2, all units must have the same setpoints. The units’ proportional band, deadband and related settings may differ.

4.1.5Standby – Rotation

Typical Standby (Lead/Lag) Function

This function can be performed in any teamwork mode, including NO.

One or more units can be defined to be Standby; the normal status of standby units is Standby Off (fan off).

In case one regular unit has an alarm that is defined (to be defined in the alarm configuration), to switch on a standby unit, the faulty unit will switch off and the standby unit will switch on.

If the next unit has an alarm, the next standby unit will be started. If no more standby units are available, the unit with a non-critical alarm that permits unit operation will be switched on again (water detection, fan alarm, fire alarm etc. will not permit unit restarting).

The standby function can be rotated daily (setting the time), weekly (setting the day of the week and time) or monthly (setting the first weekday of the month and time).

The rotation is performed with a selectable number of units: if 1 is selected, to standby rotates from 1-2 to 2-3 in a 4 units configuration with two standby units, and rotates from 1-2 to 3-4 in the same configuration, when the rotation parameter is set to 2.

NOTE

Before entering standby mode, units will operate the fan only for 3 minutes to cool the electrical heaters, remove steam from the unit, etc.

Standby and Cascade

Cascade is possible in Teamwork Mode 1 only.

Standby units will start if an alarm occurs in one of the operational units. If the standby units are cascaded, they will also start and work with the regular operational units if the temperature or humidity cannot be controlled by the operational units; before a high or low temperature / humidity condition occurs. Cascaded units are switched off again as soon as the temperature / humidity returns back to normal.

The master unit defines its proportional band according to the number of available units (see 4.1.3 - Teamwork Mode 1).

When a standby unit receives a request for full heating or cooling from the master unit (see 3.3.1 - Temperature Proportional Band), it will respond to the request after its control delay.

NOTE

Cascaded units are not included in the calculation of the average temperature / humidity.

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Contents Liebert iCOM Page Table of Contents Mounting a Large Display on a Wall Installing a Liebert Icom UNIT-TO-UNITNETWORKTeamwork Figures Tables Large and Small Displays FeaturesESC Icon Key Name Function Keyboard icons and functionsStatus menu, large display, graphical view Navigating Through the Liebert iCOM Menus Accessing SubmenusAccessing Submenus on Small Displays Accessing Submenus on Large DisplaysMenu tree-Small display, stand-alone or networked Entering a PasswordAdvanced Menu Unit Service Menu UnitStatus Menu System View Status Menu Unit 1 View User Menu Advanced Menu Unit # Service Menu Unit #Viewing Multiple Units with a Networked Large Display SET User menu icons Service menu icons Unit/Fan Control Start Stop Single Unit FunctionsAutorestart Loss of Power AlarmFan Alarm / Fan Protection Settings VSD Setpoint VSD Fan Speed SettingPump Down High Pressure AlarmCompressor Sequencing Digital Scroll High TemperatureCompressor Timing-Units With Two Compressors MBV Operation After Compressor is Turned Off Service Offset-Changing System Pressure SettingsMotorized Ball Valve in Digital Scroll Units Temperature proportional band Temperature Proportional BandTwo Single-Step Compressors Without Unloaders-Two-Step Compressor ControlCompressor Proportional Bands One Single-Step Compressor Without Unloaders-One-StepTwo compressors with unloaders four-step Two Compressors With Unloaders-Four-StepDigital scroll capacity modulation, 10-100% variable Digital Scroll CompressorsChilled Water Control Temperature Control-Second Cooling SourceDifferential Temperatures / Controls Comparator Circuit Delta T Temperature Difference Between Room and GlycolSecond cooling source and compressorized cooling Dual Cooling Source Temperature Control-ReheatReheat configuration types Glycool Cooling-Free-CoolingHeat On ½ Dead Band 100% Off ½ Proportional Band Decreasing TemperatureSCR Reheat Tight ModeStandard Mode Humidification Humidity ControlHumidification Dehumidification External Humidifier Control-Optional Humidification Infrared HumidifierParameters for infrared humidifier control Dehumidification Compressor Quantity Dehumidification With Comp settingsDehumidification Dehumidification Low LimitReheat During Dehumidification Temperature and Humidity Control TypesControl Types Humidity Sensor Reading Control Types Supply Limit-Optional High and Low, Temperature and Humidity EventsCustomer inputs User Inputs / Customer InputsEvent Types Time DelayEnable or Disable Event Types and PropertiesMain FAN Overload Event notifications-large or small display Possible Event NotificationsCalculating Unit Wellness Next Maintenance CalculationCalculation of Next Maintenance and Diagnostics Compressor 1 / 2 Settings and Diagnostics Parameters for Next Maintenance CalculationGeneral Maintenance Settings Fans / Heaters / Humidifier Settings and DiagnosticsNo Teamwork Teamwork ModeTeamwork Modes Application of Teamwork ModesTeamwork Mode 1 with two cooling units Standby and Cascade Standby Rotation Typical Standby Lead/Lag FunctionMinimum Network Switch Requirements Placement of Cooling UnitsU2U Hardware Cables and Network Switch Liebert iCOM U2U Ethernet Network Wiring for Unit-to-Unit Communications-U2USample Liebert iCOM network configurations Combining Large and Small Displays on a U2U Network Wiring a Liebert iCOM U2U Network Small DisplaysLarge Displays Wall-Mount Large DisplayWiring a small display for stand-alone operation Wiring a large display for stand-alone operation Liebert vNSA Ports available for connecting Liebert iCOM control devices298 84mm 305mm 14.25 362mm DPN001136 Rev Mounting Instructions Location ConsiderationsNecessary Mounting Items Liebert iCOM display dimensions Event log parameters Spare Part List-Large Display OnlySetpoints parameters Spare part list parameters-large display onlySensor data Set alarms parametersDisplay setup parameters Active AlarmsActive alarms parameters Total run hours parameters Timer parameters-Sleep ModeService contacts parameters Service Menu Parameters Unit diary parameters Unit Diary-Large Display OnlyMaintenance / wellness settings parameters Standby settings / lead-lag parametersWellness COMP2 Wellness HEAT2 Diagnostics / service mode parameters ALM REL 7of Delay Enable Disab Enable Disab Comp 1 Overload Unit X Disconnected WRN Loss of Power LOP MSG, WRN, ALM Call Service MSG, WRN, ALM High Temperature Sensor calibration / setup parameters System / network setup parameters-large display only GBP Network setup parametersStatic RAM Not Available, Invalid, OK HUM Steam Options setup parametersService contact info parameters Service Menu Parameters Service Menu Parameters Page That Ne tIti Ti n
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