FanControl

Applicable to library's version 1.0

The FanControl is a component to control the fan. The component has been created for 1-, 2-, or 3-speed fans, and for fans with an analog input (the type of the fan can be selected by the user). The fan algorithm can be split into two modes:

• Standard: the demand for the fan is active, and the fan speed is calculated based on the temperature value. The standard mode conditions:
  • the FanDemand slot is false;
  • the Antifrost slot is false;
  • the HeatingOccupiedActive slot is false;
  • the CoolingOccupiedActive islot s false;
  • the TestMode slot is 0.
• Non-standard: the additional parameters override the fan speed. The non-standard mode must comprise at least one of the slots: FanDemand, Antifrost, HeatingOccupiedActive, CoolingOccupiedActive, is true, or the Test Mode is higher than 0.

In the standard mode, the fan is switched on when the internal variable, the Fan Control Value (calculated on the basis of the Control Variable and Setpoint slots), is higher than the Fan Speed 1 Threshold, and switched off when the Fan Control Value is lower than the Fan Off Threshold.

The non-standard operation is defined by the slots states combinations and is described below.

Slots

The FanControl component has the following slots:

• Fan Control State: indicates the control state of the fan;
  • Available information: Running, Switching Speeds, DelayedOff, Off;
• Fan Status: indicates the current status of the fan;

  • Available information: Off, Speed 1 (Manual), Speed 2 (Manual), Speed 3 (Manual), Speed 1 (Auto), Speed 2 (Auto), Speed 3 (Auto), Analog Control; 

• Fan Analog Out: the component's output for the fan with analog input, expressed as percentage; for fans with discrete inputs (the Fan Type slot is set to 1, 2 or 3), the value of the Fan Analog out is equal to 0%;
• Speed 1, Speed 2, Speed 3: the component's outputs for fans with binary inputs; for fans with analog inputs (the Fan Type slot is set to 0), states of the Speed 1, Speed 2, and Speed 3 slots are set to false, and cannot be changed by the algorithm of the component;

Note: The FanControl component has a built-in protection against enabling several speeds at the same time, which could cause physical damage to the fan. If the current fan speed has to be changed to another one, all binary outputs responsible for fan speeds are disabled for 1 second, and only then the new speed is enabled.  

• Fan Active: allows to  confirm the operation of the fan;
• Effective Fan Mode: controls the actual mode of the fan depending on the mode set in the Fan Mode slot and its overriding conditions;
• Fan Mode: the main input of the component;
  • Available settings: Off, Speed1(Manual), Speed2(Manual), Speed3(Manual), Auto

• Fan Type: sets the type of the controlled fan;
  • Available settings: Analog, 1Speed, 2Speed, 3Speed;

Note: The FanControl component has a built-in protection against enabling speeds higher than these resulting from the value of the Fan Type slot. For example, if the Fan Type slot is set to 1Speed, it is not possible to enable speeds higher than 1. This protection pertains only to fans with binary outputs.

• Occupancy Status: sets the occupancy status.
  • Available settings: Unoccupied, Occupied, Standby;
• Test Mode: allows to enable or disable the testing mode. This mode is inactive if the value of the slot equals 0. In other cases, fan works in the testing mode–the current speed will be overridden by the maximum value available for the fan type (depending on the value of the Fan Type slot);
• Control Variable: the measured temperature, which is used for calculating the fan speed in the Auto mode;
• Setpoint: sets the temperature setpoint, which is used for calculating the fan speed in the Auto mode;
• Fan Demand: allows to force switch the fan on if it is off (the Fan Active slot is set to false);

• Heating Cooling: allows to set the temperature mode, which the fan works in;
  • Available settings: Heating, Cooling;
• Antifrost: allows to switch on the Antifrost mode;
  • Available settings: true (Antifrost mode enabled, the current speed will be overridden by the maximum value available for the fan type, depending on the value of the Fan Type slot), false (Antifrost mode disabled);
• Window Status: allows to enable the Window Open mode;
  • Available settings: true (Window Open mode disabled), false (Window Open mode enabled, the current value of the Fan Mode slot will be overridden to Off);

Note: The Window Open mode can be overridden only by the Antifrost mode or the Test mode.

• Fan Off Threshold, Fan Speed 1 Threshold, Fan Speed 2 Threshold, Fan Speed 3 Threshold: set  values of thresholds used for switching fan speeds (in Auto mode, for fans with binary inputs), calculating the value of the Fan Analog Out slot (in manual modes, for the fan with analog output);
• Fan Scale: sets the value, which is used for calculating the fan speed in the Auto mode;

Note: Calculating the fan speeds is based on the internal variable named Fan Control Value. The way of calculating this value is presented  by the figure below:

The Fan Control Value is used to calculate the current speed of the fan (for fans with binary inputs), or the value of the Fan Analog Out slot (for fans with analog input). The way of calculating both values is presented by the below figures:

• Heating Occupied Active: allows to enable or disable the function enforcing fan operation;
  • Available settings: true (enabled), false (disabled);

• Cooling Occupied Active: allows to enable or disable the function enforcing fan operation;
  • Available settings: true (enabled), false (disabled);

Note: The way of calculating the current speed of the fan (for fans with binary inputs) or value of Fan Analog Out slot (for the fan with analog input), when Cooling/Heating Occupied Active function is enabled, is presented in the figures below:

• Fan Delay Off: sets the value of the delay-off time, expressed in seconds; each time, the fan should be switched off, it remains working for the time equal to the value of this slot; after this time, the fan will switch off. If the slot is set to 0, the function is disabled;
• Soft Start Time: sets the time, in which the fan is working in the Soft Start mode, expressed in seconds. If the slot is set to 0, the function is disabled.
• Soft Start Value: sets the value for the Soft Start mode, expressed as percentage.

Note: If the Soft Start Value is lower than the Fan Speed 1 Threshold, the value will be taken from the Fan Speed 1 Threshold slot.

Note: The Soft Start function is dedicated to fans with analog input. If the fan start with small control value ramp lasts too long or is impossible, overheating of the driver or motor can occur. In this function, the fan start output value will be increased to the Soft Star Value for the time defined in the Fan Soft Start Time. If the time of the soft start is finished, the Fan Analog Out slot is set to the current value calculated by the algorithm of the component.