Advanced HVAC Control System Development
Budget: €30 – €250 EUR
This project includes the control of a simulated Air Handling Unit and Compensated heating circuit.
The 230V AC ‘Air Handing Unit’ (AHU) fan in this project shall be controlled using a VSD. A green ‘AHU Fan Running’ light on the front panel shall indicate if the fan is running. The operator should be able to set a desired speed of the fan on the HMI. The fan may also be controlled by a ‘Filter DP’ potentiometer at the front panel of the board. The potentiometer is being used to simulate a filter dirty condition, with an increase in resistance indicating an increasing filter dirty condition, thereby increasing the speed of the AHU fan to compensate. If there is a VSD fault, the AHU system should stop operating, and a red ‘VSD fault’ light shall illuminate at the front panel. Separate A temperature transmitters shall read the temperature inside and outside of the application and relay this information back to the HMI. Based on temperature inputs, two actuators shall open and close to control heating and cooling coil valves, thereby tempering airflow through the AHU. A simulated fire alarm switch on the front panel shall be activated or normal, and shall be indicated by a green ‘Fire Alarm Normal’ light on the front panel. The system should only be operational if fire alarm is in normal mode, and the green ‘Fire Alarm Normal’ light is illuminated. A frost stat is being simulated by a switch on the front panel, and shall be activated or normal. The system should only be operational if the frost stat is in normal mode. An AHU Damper Open/Closed input is being simulated by a switch on the front panel. The AHU Damper must be in the open position before allowing the AHU fan to turn on.
The presence of 24 Volt power and 230 Volt power are indicated by two green lights on the front panel.
To simulate control of the flow of water through a pipe, a 4-20mA space heating actuator shall be used. This actuator may be controlled using a ‘Space Temperature’ potentiometer on the front panel of the board, where an increase in resistance will gradually open the heating actuator. It shall also be controlled by the operator by setting a set point on the HMI. A ‘Heating Pump Running’ green light shall simulate that the heating pump runs if the space calls for heat and the heating actuator is open.
Start/Stop functionality shall be available on the HMI via touch buttons. When system is running, text should be visible showing the operator that the system is running. This should also be the case for if the system is stopped. If a fault occurs, the operator should be notified. Setpoints for desired room temperature and AHU VSD fan should be able to be set on the HMI. ‘24v OK’ green light on the front panel should be on if 24v system is ok, this is determined by power supply being healthy. System should only be operational if ‘230v OK’ green light and ‘24v OK’ green light are activated on the front panel.
Equipment
VSD
Temperature sensor x2
4-20mA Actuator x3
ESTOP button for fan
Isolator Switch
Variable res pot x2
Panel Switches x3
Lights x6
Mains Isolator
Unitronic V570 HMI
Unitronic V200-18-E3XB Controller
Program to be coded in Unilogic software
The 230V AC ‘Air Handing Unit’ (AHU) fan in this project shall be controlled using a VSD. A green ‘AHU Fan Running’ light on the front panel shall indicate if the fan is running. The operator should be able to set a desired speed of the fan on the HMI. The fan may also be controlled by a ‘Filter DP’ potentiometer at the front panel of the board. The potentiometer is being used to simulate a filter dirty condition, with an increase in resistance indicating an increasing filter dirty condition, thereby increasing the speed of the AHU fan to compensate. If there is a VSD fault, the AHU system should stop operating, and a red ‘VSD fault’ light shall illuminate at the front panel. Separate A temperature transmitters shall read the temperature inside and outside of the application and relay this information back to the HMI. Based on temperature inputs, two actuators shall open and close to control heating and cooling coil valves, thereby tempering airflow through the AHU. A simulated fire alarm switch on the front panel shall be activated or normal, and shall be indicated by a green ‘Fire Alarm Normal’ light on the front panel. The system should only be operational if fire alarm is in normal mode, and the green ‘Fire Alarm Normal’ light is illuminated. A frost stat is being simulated by a switch on the front panel, and shall be activated or normal. The system should only be operational if the frost stat is in normal mode. An AHU Damper Open/Closed input is being simulated by a switch on the front panel. The AHU Damper must be in the open position before allowing the AHU fan to turn on.
The presence of 24 Volt power and 230 Volt power are indicated by two green lights on the front panel.
To simulate control of the flow of water through a pipe, a 4-20mA space heating actuator shall be used. This actuator may be controlled using a ‘Space Temperature’ potentiometer on the front panel of the board, where an increase in resistance will gradually open the heating actuator. It shall also be controlled by the operator by setting a set point on the HMI. A ‘Heating Pump Running’ green light shall simulate that the heating pump runs if the space calls for heat and the heating actuator is open.
Start/Stop functionality shall be available on the HMI via touch buttons. When system is running, text should be visible showing the operator that the system is running. This should also be the case for if the system is stopped. If a fault occurs, the operator should be notified. Setpoints for desired room temperature and AHU VSD fan should be able to be set on the HMI. ‘24v OK’ green light on the front panel should be on if 24v system is ok, this is determined by power supply being healthy. System should only be operational if ‘230v OK’ green light and ‘24v OK’ green light are activated on the front panel.
Equipment
VSD
Temperature sensor x2
4-20mA Actuator x3
ESTOP button for fan
Isolator Switch
Variable res pot x2
Panel Switches x3
Lights x6
Mains Isolator
Unitronic V570 HMI
Unitronic V200-18-E3XB Controller
Program to be coded in Unilogic software