Designed Comfort Conditions

Air Handling Unit Operation (Auto / Manual Mode), Frost Protection, Damper Opening Time, Damper Position, Enthalpy and Temperature Control, Fan Control, Night Ventilation and Night Operation, Fire Mode - Stop, Heating / Cooling Requirement.

Points shown on the Plant Automation Screen (SCADA)


  • Fresh air temperature
  • Blowing temperature
  • Blowing temperature set value (compensated value)
  • Return temperature
  • Return relative humidity
  • Return CO2 ratio
  • Minimum fresh air damper position
  • Heating valve command
  • Cooling valve command
  • Fresh air damper command
  • Mix damper command
  • Exhaust damper command
  • Local temperature set point
  • Set temperature set value (compensated value) Supply Fan on / off
  • Supply fan thermal failure information
  • Supply fan DPS information
  • Supply fan auto / manual information
  • Supply fan off alarm information
  • Supply fan on alarm information
  • Supply fan belt broken alarm Supply fan working time
  • Supply fan thermal failure information
  • Return Fan on / off Return fan DPS information Return fan auto / manual information
  • Return fan off alarm information
  • Return fan on alarm information
  • Return fan belt broken alarm Return fan working time Freezing alarm
  • Filter states
  • Ventilator Maintenance Alarm (According to the working hours)

MCC and DDC Panels

  • It contains engine control and control devices. (Main switch, contactors, motor protection switches, phase protection relays, motor drivers ...)
  • Panels where electricity is supplied or cut off to mechanical systems.
  • These panels are the panels that the automation system monitors / controls.
  • MCC panels should be designed for automation.

DDC (Direct Digital Control) Panels

  • It contains devices for automation. (PLC, control cards, cable terminals…)
  • Automation monitoring / control processes are carried out in these panels.
  • Other name is automation panels. This is where MCC boards are controlled / monitored.
  • Here, data from the sensors are collected, interpreted and sent to the computer or commands are given from these panels to the mechanical devices.

Communication Between MCC and DDC Panels

  • DDC and MCC boards communicate with protocols such as Modbus, CanBus, Fieldbus, Profibus, DeviceNet, ControlNet, AS-i or Hart.
  • LIHCH cables are generally used between DDC and MCC.
  • When commanded from the automation computer, the command goes to the DDC board. The control card in the DDC board transmits the command to the MCC board. So the engine starts or stops.
  • Mechanical devices may contain sensors that produce various analog or digital information, such as temperature, humidity or pressure. This sensor data is read through the cards in the DDC board. The information read is transferred to the automation computer. Thus, various warnings appear in the automation software.
  • Mechanical devices can be controlled manually on the MCC panel when needed.
  • There should be emergency stop buttons on the mechanical devices for emergency stop operation.