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InRow RC Operation and Maintenance Manual18
NOTE: If the Supply Air setpoint is greater than the Cool setpoint, the cooling unit triggers an alarm
and resets the Supply Air setpoint to equal the Cool setpoint.
• Fan Spd: Set the fan speed preference that will give you the desired temperature difference (DT). Each
fan speed provides an approximate DT between the supply air from the Rack PDU and the air returned
from the rack.
–Low = 16.7°C (30°F) DT (60% of maximum fan speed)
– Med-Low = 13.9°C (25°F) DT (70% of maximum fan speed)
– Med = 11.1°C (20°F) DT (80% of maximum fan speed)
– Med-High = 6.3°C (15°F) DT (90% of maximum fan speed)
– High = 5.6°C (10°F) DT (100% of maximum fan speed)
NOTE: The cooling group will automatically override this fan speed setting and adjust the fan speed
to provide optimum cooling for the environment as needed.
PID settings
Path: Main > Set Group PIDs
The Proportional plus Integral plus Derivative (PID) loop controls the output of the fans.
NOTE: All changes to settings must be performed by qualified personnel.
Gain (P): The proportional multiplier (gain) for this mode or actuator. The proportional multiplier adjusts for the
difference (error) between the measured value and the setpoint.
Rate (I): The integral multiplier (reset rate) for this mode or actuator. The integral multiplier adjusts for error
measurement and the amount of time that the error has existed. The integral multiplier adds to or subtracts
from the output in small increments to correct for the offset error caused by the proportional contribution.
Deriv (D): The derivative multiplier (derivative) for this mode or actuator. The derivative multiplier adjusts the
output for rapid changes in the error, correcting for the rate of change of the error over time.