Emerson Liebert iCOM User Manual Page 40
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Operation
Liebert
®
iCOM
®
30
Proportional—If Proportional control is selected, the percent cooling/heating requirement is
determined by the difference between the air temperature sensor reading and the temperature
setpoint. The Temperature Proportional Band is a user-defined range that is divided into two equal
parts for cooling and heating. Figure 25 illustrates how the temperature proportional band is evenly
divided on either side of the temperature setpoint.
Figure 25 Temperature proportional band
The Temperature Setpoint is between these two equal parts. As the air temperature rises above the
temperature setpoint, the percent cooling required increases proportionally (from 0 to 100%) over half
the programmable temperature proportional band.
The percent heating requirement (0 to -100%) is determined the same way when the air temperature
falls below the setpoint. The humidifying/dehumidifying operations are controlled in the same
manner as the cooling/heating operations; however, the humidity sensors, setpoints and proportional
bands are utilized.
When the air temperature reaches the end of the proportional band, either 100% or -100%, full cooling
or full heating capacity is provided. No operation is performed when a 0% call is calculated or the
temperature is within the deadband. The control varies the call for cooling and heating in 1%
increments as the air temperature moves through the proportional band halves.
PI—PI Control functions with all type of compressors and valves. If PI Control is selected, the percent
cooling/heating requirement is calculated by combining two methods, proportional and integral. The
proportional term is calculated similar to the previously described Proportional control. The integral
term (sometimes called “reset action”) is calculated by measuring how much and how long the air
temperature/humidity has been above or below the setpoint. If the actual air temperature/humidity is
above the setpoint, the percent requirement is slowly but continuously increased until the total is
sufficient to bring the return room air back to the setpoint. The control helps to ensure temperature
setpoint is achieved while efficiently operating the equipment. The Proportional and Integral
concepts work together to prevent excessive valve oscillation, compressor short cycle and temperature
fluctuations. From an idle state (compressor[s] Off, chilled water valve closed, etc.), the call for cooling
is based on proportional temperature increase from setpoint. As temperature deviates further from or
closer to setpoint, the call for cooling is increased or decreased, respectively. The amount of cooling
staged depends on how far the actual temperature has deviated from the setpoint on the proportional
(P) band.
Example: Temperature Setpoint= 70°F (21°C)
Temperature Proportional Band= 20°F (11.11 K; see Note below)
Room Temperature= 75°F (24°C)
Because cooling accounts for half of the proportional band, the call for cooling in this example is 50%.
If the room temperature increases to 80°F, the call for cooling would be 100%. Proportional only
control will not function satisfactorily in some applications as shown in this example, because the
room temperature would increase 10°F (5.5 k) above the setpoint before cooling is staged to 100%.
0%
Setpoint
0%
Cooling
+ Temp
+ 100%
Cooling
½ Proportional Band
Dead-
band
-Temp
Heating
-100%
Heating
½ Proportional Band
CoolingHeating
-Temp + Temp
0%
Setpoint
+ 100%
Cooling
-100%
Heating
½ Proportional Band½ Proportional Band
With Deadband
Without Deadband
- 2
- TABLE OF CONTENTS 3
- 1.0 INTRODUCTION 11
- 2.2 System Screen 16
- USER MENUS 20
- 2.5 Display Setup 22
- Figure 16 User menu icons 24
- Table 2 User menu icons 24
- Figure 17 Service menu icons 26
- Table 3 Service menu icons 26
- 3.0 OPERATION 28
- Autorestart 29
- Loss of Power Alarm 29
- Minimum Fan Speed 31
- Operation 32
- 3.1.4 Power Monitoring 33
- Low-Pressure Time Delay 33
- Advanced DX Freeze Protection 33
- Pump Down 34
- High-Pressure Alarm 34
- 25 Liebert 35
- Settings 37
- 3.3 Temperature Control 39
- 3.3.1 Setting Up PI Control 41
- 3.3.2 Compressor Control 42
- Compressor Proportional Bands 42
- 3.4 Liebert Fluid Economizer 45
- Cooling—Free-Cooling 47
- Dual-Cooling Source 48
- 3.4.2 Liebert Air Economizer 48
- DETAIL CDETAIL B 49
- DETAIL D 49
- FRONT VIEW 49
- Both possible low-voltage 50
- Determine which applies 50
- 3.5 Liebert Air Economizer 51
- Operation 51
- System Overview 52
- 3.5.1 Liebert Air Economizer 52
- (Not by 53
- Emerson) 53
- Not in Operation 54
- Startup Configurations 54
- 45 Liebert 55
- 47 Liebert 57
- 3.6.2 SCR Reheat 60
- Tight Mode 60
- 3.7 Humidity Control 61
- 53 Liebert 63
- 3.7.1 Humidification 64
- Infrared Humidifier 64
- 3.7.2 Dehumidification 64
- Dehumidification Low Limit 65
- 57 Liebert 67
- 3.8 Supply Control 68
- 59 Liebert 69
- 3.9.1 Operation 70
- Temperature Compensation 70
- Racks with Equipment 75
- Figure 60 S190 Limit 77
- Figure 61 S190 Control 77
- 3.10.2 User Inputs 81
- 3.10.3 Analog Inputs 82
- 3.10.4 Liebert iCOM-DO 83
- Calculating Unit Wellness 85
- 4.0 TEAMWORK 87
- 4.2.2 No Teamwork 88
- 4.2.3 Teamwork Mode 1 88
- 4.2.4 Teamwork Mode 2 89
- Fixed Speed 90
- Variable Speed 90
- Teamwork 91
- 81 Liebert 91
- Figure 66 Remote sensors 92
- Figure 67 Sensor positioning 92
- 4.2.6 Hardware Setup 93
- 4.3.2 DIP Switch Settings 94
- Unterminated 96
- Terminated 96
- 87 Liebert 97
- 4.3.7 Software Setup 99
- 4.3.8 Standby—Rotation 99
- Standby and Cascade 100
- 91 Liebert 101
- Small Displays 103
- Small Graphics Display 105
- Liebert iCOM 106
- I/O Board 106
- Optional Large 107
- Graphics Display 107
- (Rear View) 107
- Liebert vNSA 108
- SITESCAN 109
- 6.2 Monitoring Points 110
- 7.0 USER MENU PARAMETERS 111
- User Menu Parameters 112
- 103 Liebert 113
- 7.2 User-Graphic Menu Screens 114
- Event Log 115
- View Network 115
- 107 Liebert 117
- 109 Liebert 119
- 111 Liebert 121
- 113 Liebert 123
- Active Alarms 124
- 115 Liebert 125
- 117 Liebert 127
- 119 Liebert 129
- 8.0 SERVICE MENU PARAMETERS 131
- Service Menu Parameters 132
- 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 4-11 160
- 151 Liebert 161
- 153 Liebert 163
- 155 Liebert 165
- 157 Liebert 167
- Freecool Sensor 168
- 159 Liebert 169
- 161 Liebert 171
- 163 Liebert 173
- 165 Liebert 175
- 167 Liebert 177
- 169 Liebert 179
- 171 Liebert 181
- 173 Liebert 183
- 175 Liebert 185
- 181 Liebert 191
- (read only) 193
- Technical Support / Service 196
- Locations 196
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