APC ACRC103 Specifications download pdf (Page 23)

15InRow RC Operation and Maintenance

PID settings

Path: Main > Set Group PID

The Proportional plus Integral plus Derivative (PID) loop is used to control the output of the cooling

group.

The PID settings apply only when using the In-Row rack deployment strategy. See

“Configure the cooling group” on page 13 for information on selecting a rack deployment

strategy.

Gain (P). The proportional multiplier (gain) for this mode or actuator. The proportional multiplier

adjusts for the difference (error) between the measured temperature and the setpoint. The proportional

multiplier is expressed in percent of output per unit error.

Rate (I). The integral multiplier (reset rate) for this mode or actuator. The integral multiplier adjusts for

error measurement and for 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. It is expressed in percent of output for each minute and unit of error (error multiplied by

minutes).

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. It

is expressed in percent of output for each unit of error per minute (error divided by minutes).

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APC ACRC103 Specifications Page 23