Emerson Liebert iCOM User Manual Page 88
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Teamwork
Liebert
®
iCOM
®
78
Figure 64 Teamwork Mode 1, serial staging
4.2.4 Teamwork 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 in this mode.
4.2.5 Teamwork Mode 3 (Optimized Aisle)
Teamwork Mode 3 can be selected when the units are set to operate in Optimized Aisle Control mode
and have been connected in a unit-to-unit network. Teamwork provides coordination between the
units that will prevent “fighting” by not allowing units to operate in conflicting modes of operation at
the same time by selecting which mode to operate within based on the average of the collective unit
sensors (Cooling vs. Heating and Humidifying vs. Dehumidifying). For additional details, see 3.9 -
Liebert Optimized Aisle Control.
Teamwork Mode 3 allows the cooling capacity (Supply Sensor) to operate as a local control by
removing only the amount of load required to maintain the discharge air temperature at each unit.
This allows for an unbalanced room load while maintaining a consistent discharge air temperature.
The fan speed is controlled by the remote rack sensors of all units, providing a controlled delivery
method of the air to the cold aisle. In raised floor applications, Liebert iCOM units will share sensor
information to achieve even under-floor air distribution. This distribution is achieved by operating all
fans in parallel, which will also yield the greatest energy efficiency.
Figure 65 shows the difference in both under-floor air distribution and energy consumption when
Variable Fan speed and Teamwork Mode 3 are applied to the Liebert cooling units. The example on
the left is using the standard standby configuration; the example on the right is utilizing Teamwork
Mode 3. The units below are assuming that the fan power consumed at each unit is 8.1kW when
operating at 100%.
NOTE
In Teamwork Mode 2, all units must have the same setpoints. The units’ proportional band,
deadband and related settings may differ.
C1 C2
cooling
+100 %
0%
1/2 Proportional Band
+temp.
Unit 2 Deviation : 20%
Setpoint
C1 C2
cooling
+100%
0%
1/2 Proportional Band
+temp.
Setpoint
0%
Setpoint
- temp.
-100 %
+temp.
1/2 Proportional Band +100%
1/2 Proportional Band
heating
100 %
60%
0%
System Deviation : 60%
System proportional band
Unit 1 Deviation : 100%
- 2
- TABLE OF CONTENTS 3
- 1.0 INTRODUCTION 11
- 2.1 System Screen 14
- 5Liebert 15
- 2.2 Main Unit Screen 16
- 2.3.2 Accessing Submenus 17
- Display Filtering 19
- 2.3.3 Entering a Password 20
- Figure 14 User menu icons 23
- Table 2 User menu icons 23
- Figure 15 Service menu icons 24
- Table 3 Service menu icons 24
- 3.0 OPERATION 26
- Autorestart 27
- Loss of Power Alarm 27
- Minimum Fan Speed 29
- Operation 30
- Low-Pressure Time Delay 31
- Advanced DX Freeze Protection 31
- Pump Down 32
- High Pressure Alarm 32
- 23 Liebert 33
- Settings 34
- 25 Liebert 35
- 3.2.2 Compressor Control 36
- Compressor Proportional Bands 36
- 27 Liebert 37
- 3.2.3 Chilled Water Control 38
- 29 Liebert 39
- 31 Liebert 41
- Cooling—Free-Cooling 42
- Dual-Cooling Source 42
- DETAIL CDETAIL B 43
- DETAIL D 43
- FRONT VIEW 43
- DETAIL E 44
- 35 Liebert 45
- 3.4 Liebert Air Economizer 46
- Operation 46
- 37 Liebert 47
- 3.4.2 Liebert Air Economizer 48
- System Overview 48
- (Not by 49
- Emerson) 49
- Out of Service 50
- 41 Liebert 51
- 43 Liebert 53
- 3.5.2 SCR Reheat 57
- Tight Mode 57
- 3.6.1 Humidification 59
- Infrared Humidifier 59
- 3.6.2 Dehumidification 60
- Dehumidification Low Limit 60
- . If the proportional 63
- Setting Up PI control 64
- 3.8 Supply Control 66
- 3.9.1 Operation 67
- Temperature Compensation 68
- Racks with Equipment 73
- Figure 59 S190 Limit 75
- Figure 60 S190 Control 75
- 67 Liebert 77
- 3.10.2 User Inputs 80
- and Liebert DS 81
- Air-Cooled Units 81
- 3.10.4 Liebert iCOM-DO 82
- Calculating Unit Wellness 84
- 75 Liebert 85
- 4.0 TEAMWORK 86
- 4.2.2 No Teamwork 87
- 4.2.3 Teamwork Mode 1 87
- 4.2.4 Teamwork Mode 2 88
- Fixed Speed 89
- Variable Speed 89
- Teamwork 90
- 4.2.6 Hardware Setup 91
- 4.3.2 DIP Switch Settings 92
- Unterminated 94
- Terminated 94
- 85 Liebert 95
- Grounded CANbus Cable 97
- 4.3.8 Software Setup 99
- 4.3.9 Standby—Rotation 99
- Standby and Cascade 100
- 91 Liebert 101
- Small Displays 104
- Large Displays 104
- 95 Liebert 105
- Small Graphics Display 106
- Liebert iCOM 107
- I/O Board 107
- Graphics Display 108
- (Rear View) 108
- Optional Large 108
- SITESCAN 110
- 6.1 Terminals 77 and 78 111
- via 77/78 112
- 7.0 USER MENU PARAMETERS 113
- User Menu Parameters 114
- 105 Liebert 115
- 7.2 User-Graphic Menu Screens 116
- Event Log 117
- View Network 117
- 109 Liebert 119
- 111 Liebert 121
- 113 Liebert 123
- Active Alarms 125
- 117 Liebert 127
- 119 Liebert 129
- 121 Liebert 131
- 8.0 SERVICE MENU PARAMETERS 132
- Service Menu Parameters 133
- 123 Liebert 133
- 125 Liebert 135
- 127 Liebert 137
- 129 Liebert 139
- 131 Liebert 141
- 133 Liebert 143
- 135 Liebert 145
- 137 Liebert 147
- 139 Liebert 149
- 141 Liebert 151
- 143 Liebert 153
- 145 Liebert 155
- 147 Liebert 157
- 149 Liebert 159
- Set Alarm Screens, Pages 4-10 160
- 151 Liebert 161
- 153 Liebert 163
- 155 Liebert 165
- 157 Liebert 167
- 159 Liebert 169
- 161 Liebert 171
- 163 Liebert 173
- 165 Liebert 175
- 167 Liebert 177
- 169 Liebert 179
- 171 Liebert 181
- 9.0 MONITORING POINTS 187
- Example of points generated 188
- Monitoring Points 189
- 179 Liebert 189
- Technical Support / Service 192
- Locations 192
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