APC ACRA100 Installation Manual download pdf (Page 34)

Pumped Refrigerant System Operation and Maintenance26

Group PIDs

Path: Main > Groups > Select Group

Set Cool PID. Tune the Rack Inlet Temperature Controller. (InRow mode only)

Reset to Defaults. Resets to the default settings.

The Proportional plus Integral plus Derivative (PID) loop controls the output of the fans.

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.

NOTICE

HAZARD TO EQUIPMENT

This procedure is to be performed by APC authorized personnel only. Improperly set PID

controls could result in equipment damage.

Failure to follow these instructions can result in equipment damage.

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APC ACRA100 Installation Manual Page 34