APC ACRC301S User's Guide download pdf (Page 17)

Operation: Control the Environment

InfraStruXure InRow RC—Operation and Maintenance 11

Fan Spd. Set the fan speed preference for the cooling group. Each fan speed provides an approximate

temperature difference (DT) between the supply air from the InRow RC and the air returned from the

rack.

• Low=30°F (16.7°C) DT

• Med-Low=25°F (13.9°C) DT

• Med=20°F (11.1°C) DT

• Med-High=15°F (6.3°C) DT

• High=10°F (5.6°C) DT

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.

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 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).

Note

The cooling group will automatically override this fan speed setting and adjust the fan

speed to provide optimum cooling for the rack as needed.

The PID settings apply only when using the In-Row rack

deployment strategy. See “Configure the cooling group” on

page 8 for information on selecting a rack deployment

strategy.

On/Standby

View Alarms

Clear Alarms

View Event Log

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Clear Event Log

Configure Modbus

Set Date & Time

Set Password

Set Display Units

Configure Display

Configure Network

About InRow RC

Set Identification

Service Intervals

View Run Hours

Configure Unit

Configure Group

Set Group PID

View Group Status

View Unit Status

Set Group Setpoints

Set Unit Thresholds

Cool

Gain(P): 20

Rate(I): 0

Deriv(D): 0

.00

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APC ACRC301S User's Guide Page 17

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