Assessments - 2, GPA: 4
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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. Reset to Deflts (InRow or Spot (Proportional) only). The Gain, Rate and Derivative coefficients return to their default values. InRow RD 10 kW Air Cooled Operation and Maintenance Tune the PID loop Tune the PID loop to optimize the performance of the cooling group. Caution: This procedure must be performed by APC authorized personnel only. The PID loop must be tuned after the equipment in the room is installed and running. The loop should be tuned periodically to account for changes in the room load. 1. Adjust the integral and derivative constants to zero and the proportional constant to 1.0. 2. Set the temperature setpoint value and start the cooling group. 3. When the temperature reaches a stable value, increase the proportional constant by 0.5. If the temperature does not respond to this change, adjust the setpoint. 4. Repeat step 3 until the temperature value starts to oscillate and the peak amplitude of the oscillations is constant. 5. Note the time, in minutes, between the peaks of the oscillations. This is the Ultimate Period, PU. 6. Note the value of the proportional constant. This is the Ultimate Gain, GU. 7. Compute the PID constants using the table below. Use the equations for that control method in the row to compute the values for each constant. Control Method Proportional Integral Derivative P 0.5*GU – – P + I 0.45*GU 0.54*GU/PU – P + I + D 0.6*GU 1.2*GU/PU 0.075*GU*PU 8. Set each constant according to these calculations. You may need to further tune the PID loop in the following ways to account for changes in the room load: Loop Behavior PID Tuning Correction Slow response to temperature changes Increase the proportional multiplier or increase the derivative multiplier. Overcooling/undercooling after changes in the Increase the derivative or the proportional multiplier. room load or changes in setpoint Environmental temperature never reaches the Increase the integral multiplier. setpoint Overcooling/undercooling on constant room Decrease the integral multiplier. load InRow RD 10 kW Air Cooled Operation and Maintenance Run hours The cooling unit records the number of hours each of its components has operated. When a component is replaced, use the Reset Run Hours option to reset the run hours for the displayed component to zero. Path: Main > View Run Hours • Air Filter – Reset Run Hours Note: Replace air filters with APC part number 875-2013 only. • Fans – Fan Number • Reset Run Hours • Compressor – Reset Run Hours • Condensate Pump – Reset Run Hours • Fan Power Supplies – Reset Run Hours Thresholds Set alarms to alert you to threshold violations. Path: Main > Set Unit Thresholds When the monitored input exceeds the unit threshold, an alarm occurs. Set high temperature thresholds for the following sensors: • Rack Inlet: The temperature of the air entering the rack at the rack inlet sensors • Supply Air: The average temperature of the air output from the cooling unit as measured between the upper and lower supply air temperature sensors. • Return Air: The temperature of the air entering the cooling unit at the temperature sensor Service intervals Path: Main > Service Intervals The air filters should be serviced regularly. The service interval depends on environmental cleanliness. • Air Filter Interval: Set the number of weeks before service is required for the Air Filter Interval. The default is 18 weeks. • Alarm: The interval setting has an alarm (Enable or Disable). If enabled, an audible alarm activates when the interval has elapsed. The alarm is cleared by selecting Clear Alarms in the main menu. Note: The Air Filter interval alarm is enabled by default. InRow RD 10 kW Air Cooled Operation and Maintenance Display Settings Set display interface settings including the time and date, units of measure, passwords, and time-out settings. You can also adjust the contrast, key click, beeper volume, and beep-on-alarm settings. Password and time-out Path: Main > Set Password Note: The default user password is apc (lowercase). See “Password entry” on page 15 for information on passwords. Change passwords. Set the Admin and Device passwords. 1. Move the selector arrow next to the Change Passwords option and press the ENTER key. 2. Select the password to change (either Admin or Device). 3. Enter a new password (up to 8 characters). 4. Press the ENTER key to confir...
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