Vertiv Liebert iCOM Installer/User Manual page 139

Table B.2 Service Menu Setpoints by Line ID (continued)
Line Parameter
Range
ID Name
Minimum
32 - 68 °F
S140 Chilled Water
0.0 - 20.0 °C
Temp Value
6 - 50 °F
Lockout FC at
S141 -15.0 -
Fluid Below
+10.0°C
Supply Sensor
Remote
Fan Control
S146 Sensor Return
Sensor
Sensor
Manual
41 - 104 °F
S147 Fan Setpoint
5.0 - 40.0 °C
Proportional
Fan
S148 Temperature
Control Type
Adaptive PID
Fan
4 - 200 °F
Temperature
Control Prop
2.0 - 111.0 K
Band
149
Fan
Temperature
0.0 - 15.0 min
Control
Integration Time
Fan CFF
0 - 20 %
Hysteresis
0 - 36 °F
S150
Fan Deadband 0 - 20.0 K
Airflow
S151 3.0 - 10.0 V
Calibration
Fan Speed VSD
Setpoint
0 - 100 %
Minimum
S152
Fan Speed VSD
Setpoint
0 - 100 %
Standard
Default
Description
Setting
Sets the water temperature at which 100% free cooling can be provided to handle the full
45 °F
room load. When the fluid temperature is below this setting, then the compressors will no
7.0 °C
longer turn ON until the water temperature is above the minimum CW temperature.
Prevents frost from building up on the free cooling pipes when the outdoor ambient
32 °F
temperature is extremely low by turning off the free cooling circuit when the water
0.0 °C
temperature is too low.
Return Controls the fan speed for modulation. If MANUAL is selected, then the fan speed can be
Sensor controlled from the local display or through a building management system.
Activated when a temperature sensor is being used to control the fan speed. If the same
73 °F
sensor is used for temperature control and fan speed control, then this value will reflect the
same setpoint as the temperature control setpoint. Manual mode uses fan speed STD for
22.8 °C
control.
Sets the type of control the unit will use to control fan speed. PI control gain is set in the Temp
Prop/Integral parameter. PI control will operate the fan speed so that the actual temperature
PI
PI of the fan control sensor is equal to the fan temp setpoint. If PROPORTIONAL only is
selected, the fan will change only based on the deviation from setpoint which will allow the
actual temp to settle higher than setpoint.
Adjusts the fans peed rate of change based on the actual sensor values deviation from
36 °F
setpoint. The smaller this number, the faster the fans will increase speed. Too small of a
20.0 K
number may cause the fans to increase or decrease speed and overshoot setpoint.
Adjusts the fans of the unit based on time away from setpoint so that accurate temperature
1.0 min control can be maintained. The proportional and integral work together to maintain setpoint.
Large p-band with small integral time is a typical way to achieve stable control.
Modifies the reaction of the fan speed when fan speed is being dictated by the Call for
Cooling. Adding the Hysteresis may result in a lagged response to changes in fan speed.
0.02
1 °F
Avoids overshooting of the setpoint. The value entered in this field will be split in half by the
fan speed setpoint
0.6 K
Allows the front display to be scaled to show the actual percentage of airflow independent of
the voltage operating the fan speed. This value cannot be set above/below the Analog
10.0 V
Output High/Low Limit for the fan set in the Advanced Menu. This also includes the service
menu fan speed parameters.
Sets the range for the variable fans. Minimum sets the minimum speed that the fan will
0.7
operate at. Fan speed is modulated between MIN and STD based on which sensor is set as the
controlling sensor, setpoint, and the PI settings. If the controlling sensor is set to manual, then
the STD setting will control the current fan speed. This parameter is also adjustable through
the BMS.
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