American Power Conversion Central Air Conditioning System manual How to tune the PIDs

Page 30

Operation: Control the Environment

How to tune the PIDs

A qualified service technician must tune the PID loops to optimize the performance of each mode. The units shown are for temperature. In the dehumidify loop, the units are in percent relative humidity (%RH).

The PID loops must be tuned after the equipment in the room is installed and running. The loops should be tuned periodically to account for changes in the

room load.

1.Select the PID loop to tune.

2.Adjust the integral and derivative constants to zero, and the proportional constant to twenty.

3.Set the temperature (cool or reheat) setpoint value and start the System.

4.When the temperature reaches a stable value, increase the proportional constant by 10. If the temperature does not respond to this change, adjust the setpoint.

5.Repeat step 4 until the temperature value starts to oscillate and the peak amplitude of the oscillations is constant.

6.Note the time, in minutes, between the peaks of the oscillations. This is the Ultimate Period, PU.

7.Note the value of the proportional constant. This is the Ultimate Gain, GU.

8.Compute the PID constants using the table below. Select the type of control from the rows of the table, and use the equations in the columns 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

9. Set each constant according to these calculations.

You may need to further tune the PID loops in the following ways to account for changes in the room load:

Loop Behavior

PID Tuning Correction

 

 

Slow response to temperature/humidity

Decrease the proportional multiplier or increase the

changes

derivative multiplier.

 

 

Over-cooling/Under-cooling after changes

Increase the derivative or the proportional multipliers.

in the room load or changes in setpoint

 

 

 

Environmental temperature/humidity never

Increase the integral setting.

reaches the setpoint

 

 

 

Over-cooling/Under-cooling on constant

Decrease the integral multiplier.

room load

 

 

 

24

NetworkAIR IR Operation, Maintenance, and Troubleshooting

Page 29 Page 31
Image 30
Page 29 Page 31
Contents NetworkAIR IR Precision Air Conditioner Page Contents Set Up Alarms Network Management Card Maintenance Operation Display InterfaceUsing the Display Scrolling status screensMain menu screen Navigating the interfacePassword entry Change settingsStart the System Stop the System Set Up System Configuration System OptionsOperation Set Up System Configuration System Delays Sensor setup Building managementFluid-Coil Type Applicable Settings Options for Fluid-Cooled ModulesValve Types Actuator TypesCoil Fluid Temp Activation Threshold and Deadband Set Up Contacts and Relays Input contactsOutput relays Map Description/FunctionOperation Set Up Contacts and Relays Set Up Module Configuration Configure ModuleAlarm detectors Set Up Module Control Calibrate airflow manuallyCalibrate airflow automatically Reset variable frequency drive Reset humidifierSet up Humidifier Reset compressors Control the Environment How the modes workSetpoints Deadbands ModesEssential Functions PID controls How to tune the PIDs Loop Behavior PID Tuning CorrectionHumidification sensitivity Set Up Alarms Temperature alarmsHumidity alarms Alarm delay Maint intervalsCoil fluid thresholds Set Up Group Group configGroup settings Sys failure eventsOperation Set Up Group Temperature & pressure units Set Up the DisplayPassword & Time-out Date and timeAdjust display How to update the firmwareReset to defaults Product dataSet Up Network Configuration Network configView Status Readings Module statusSystem status Group status View Event LogView Log View active alarms Respond to AlarmsMajor or minor alarm LEDs Control beeperClear active alarms Reset sys failureAlarm messages and suggested actions Displayed Alarm Message Action RequiredDisplayed Alarm Message Action Required Check that the # Systems setting Path Main Setup Group Group Module Module in which the alarm occurred Module Control Displayed Alarm Message Action Required Displayed Alarm Message Action Required Page Quick Configuration OverviewTCP/IP configuration methods APC Device IP Configuration WizardBootp & Dhcp configuration Network Management Card Quick Configuration Option 43 = 01 04 31 41 50 Local access to the control console Remote access to the control console Control consoleNetwork Management Card Quick Configuration How to Access a Configured Unit Web interfaceTelnet/SSH Snmp FTP/SCP How to Recover From a Lost Password How to Upgrade Firmware Upgrade the AOS. For example Page Monthly Preventive Maintenance EnvironmentCleanliness MechanicalElectrical Quarterly Preventive Maintenance Record the amperages for the following componentsFunctional tests Semi-Annual Preventive Maintenance Page Troubleshooting Troubleshooting Semi-Annual Preventive Maintenance Problem Possible Cause Corrective Action Page Limited Product Warranty for APC Products Terms of warrantyAPC product covered Assignment of warranties Drawings, descriptionsExclusions Limited Product Warranty for APC Products Warranty Procedures ClaimsLabor Parts Page Page APC Worldwide Customer Support

Central Air Conditioning System specifications

American Power Conversion (APC) is renowned for delivering innovative solutions in the realm of power management, but its contributions don't stop there. The company has also made significant advancements in central air conditioning systems. Featuring cutting-edge technologies and energy-efficient designs, their HVAC systems are tailored to meet modern needs while ensuring comfort and sustainability.

One of the standout features of APC central air conditioning systems is their variable speed compressor technology. This advanced system operates at different speeds rather than just cycling on and off. By adjusting the compressor speed to match the cooling demand, these systems optimize energy consumption, leading to lower electricity bills and extended equipment lifespan.

APC's systems also incorporate smart thermostat capabilities, allowing homeowners to monitor and control their air conditioning remotely. Through a mobile app, users can adjust temperature settings, create schedules, and receive maintenance alerts, all of which enhance convenience and efficiency. Furthermore, these smart thermostats can learn user habits over time, automatically adjusting temperature settings to maximize comfort and savings.

Another key characteristic of APC central air conditioning systems is their commitment to eco-friendly refrigerants. Utilizing low global warming potential (GWP) refrigerants, these systems minimize the environmental impact while maintaining high-performance standards. With energy efficiency ratings that often exceed industry benchmarks, APC systems contribute to reduced greenhouse gas emissions and help homeowners adopt sustainable practices.

The design of APC air conditioning units is also noteworthy. They are constructed with durable materials that withstand various weather conditions, ensuring reliability during the hottest months. Additionally, the streamlined design of these systems enhances aesthetic appeal, making them a suitable choice for modern homes.

In conclusion, the American Power Conversion central air conditioning system exemplifies the synergy of innovative technology, energy efficiency, and user-friendly features. With variable speed compressors, smart controls, eco-friendly refrigerants, and robust construction, APC provides homeowners with a dependable and sustainable climate control solution. As demand for energy-efficient products continues to grow, APC is poised to lead the way in intelligent air conditioning solutions that prioritize both comfort and environmental responsibility.
Top Page Image Contents