Vertiv Liebert iCOM - Page 52

Fan Control Options
Airflow Calibration
Maximum allowed fan output voltage.
Fan Control Sensor
Selects the sensor that controls automatic fan speed, see Automatic Fan Speed Control on page47 ,
– or –
Selects manual control, see Manual Fan Speed Control on the facing page . Options are:
• Supply: Air flow/fan speed is adjusted based on reading from the supply air temperature sensor.
• Remote: Air flow/fan speed is adjusted based on reading from a wired, remote temperature sensor.
• Return: Air flow/fan speed is adjusted based on reading from the wired, return air temperature sensor.
• Manual: Air flow/fan speed is adjusted using a building-management system.
Fan Control Type
Selects the method of control for the fan motor.
• Auto: Air flow/fan speed is adjusted using locally installed temperature sensors.
• Proportional: Regulation based on the difference between the fan control sensor reading and the fan setpoint.
• PI: Regulation is based on proportional and integral terms. Provides best temperature control and helps avoid fan
speed oscillation.
• Adaptive PID: Auto-tuning PID control loop, can be set for cooling or fan speed.
Fan Delta
Fan temperature setpoint, it is the temperature difference compared to the cooling setpoint.
Fan Speed Proportional Band
Adjusts the fan speed based on the deviation from the setpoint. A smaller number causes faster reaction to
temperature changes.
Fan Speed Integration
Adjusts fan speed based on time away from the setpoint to maintain accurate temperature control.
Maximum Fan Speed
Maximum percentage at which the fans will operate.
Minimum Fan Speed
Minimum percentage at which the fans will operate.
Static Pressure Deadband
Widens the setpoint to prevent small changes in static pressure from cycling the fan speed. When static pressure
reading is within the deadband, no change in fan speed occurs
3 Service Operation
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Vertiv™ Liebert® iCOM™Installer/User Guide