Fan Control
Warning!
This section applies to the Control Point and - conditionally - Control Point VAV series. Fan control is not supported in the Control Point VAV series by default, however, it can be activated using Modbus registers/BACnet objects. Please note that the Control Point VAV series is not equipped with fan control buttons on the front panel.
This feature allows a user to control ventilation devices through the following parameters or in the iSMA Configurator:
FAN_MODE: allows to select a fan mode. There are up to 5 different fan modes, which can be selected locally from the panel.
Parameter value | Fan mode |
|---|---|
0 | Off (default) |
1 | Manual, speed 1 |
2 | Manual, speed 2 |
3 | Manual, speed 3 |
4 | Auto |
Modbus register: 41602;
BACnet object: MSV1, property: Present Value;
FAN_CURRENT_SPEED: allows to set the fan operating speed and mode according to the table below:
Parameter value | Fan mode | Description |
|---|---|---|
0 | Off (default) | Fan is off |
1 | Manual speed 1 | Fan works in speed 1, manual mode |
2 | Manual speed 2 | Fan works in speed 2, manual mode |
3 | Manual speed 3 | Fan works in speed 3, manual mode |
4 | Auto speed 1 | Fan works in speed 1, auto mode |
5 | Auto speed 2 | Fan works in speed 2, auto mode |
6 | Auto speed 3 | Fan works in speed 3, auto mode |
Modbus register: 41601;
BACnet object: MSV0, property: Present Value.
This value can be updated in two ways depending on the FAN_CONFIG_LOCAL_MODE parameter (see the table):
FAN_CONFIGURATION: allows to configure the following parameters:
FAN_CURRENT_SPEED_VISIBILITY: allows to activate or deactivate a fan current speed visibility on the display. If the bit 0 is active, the fan current speed is visible as a group of icons. The icons indicate fan activity (run status), actual speed, and auto/manual mode.
Modbus register: 41614, bit 0;
BACnet object: MSV1, property: Out of Service;
FAN_EDITION: allows to determine if the FAN_MODE is editable locally from the panel. If the bit 1 is true, the fan edit submenu is active, and the user can set the FAN_MODE. If the bit 1 is false, the fan edit submenu is inactive. The default value is 1 (FAN_MODE is editable).
Modbus register: 41614, bit 1;
BACnet object: MSV1, property: 4200;
PART_EDITABLE: allows to switch between the fan full edition and fan part edition modes;
Modbus register: 41614, bit 2;
BACnet object: BO58, property: Present Value.
Full edition mode: in the fan full edition mode, all modes stored in the FAN_MODE register are available from the fan edit submenu level;
Part edition mode: in the fan part edition mode, the user can switch only between the auto and off FAN_MODE register values from the fan edit submenu level; all other fan modes are unavailable.
FAN_CONFIG_FAST_EDIT_MODE: allows to switch between the fan normal edit (default) and fan fast edit modes;
Modbus register: 41614, bit 5;
BACnet object: BO59, property: Present Value.
Normal edit mode: In the normal edit mode, any change of the edited value has to be confirmed with an occupancy button (Control Point series) or OK button (Control Point VAV series). The new value is signalized by a double blink of its name and assigned icon, and a double buzzer signal (if enabled, DEVICE_CONFIGURATION, bit 0). Once the new value selection is completed, the main menu is displayed. Pressing the fan (Control Point series) or menu (Control Point VAV) button, before confirming the new value, cancels setting the new value, and the user gets back to the main menu. If the new value is not confirmed during a time value stored in the EXIT_EDIT_TIME register, its setting is failed and the main menu is displayed.
Fast edit mode: In the fast edit mode, the change of the edited value value does not need any confirmation. The new value is saved either by pressing any button or when the EXIT_EDIT_TIME elapses. The new value is signalized by a double blink of its name and assigned icon, and a double buzzer signal (if enabled, DEVICE_CONFIGURATION, bit 0). Once the new value is saved, the main menu is displayed.
FAN_CONFIG_LOCAL_MODE: allows to set the fan to work either in the local mode or BMS mode (default);
Modbus register: 41614, bit 6;
BACnet object: BO60, property: Present Value;
Local mode: the panel's fan setting works in a local mode (the value of the FAN_CURRENT_SPEED register is determined by the value of the FAN_MODE register and so the value of the FAN_CURRENT_SPEED register cannot be overwritten by the higher level system);
BMS mode: the panel's fan setting works in the BMS mode. The FAN_MODE register works separately from the FAN_CURRENT_STATUS register.
FAN_TYPE: allows to select a fan type. The fan type selection determines, which fan modes are available in the FAN_MODE register.
Parameter value | Fan type |
|---|---|
0 | 0-10 V |
1 | 1-speed fan |
2 | 2-speed fan |
3 | 3-speed fan |
4 | 1-speed, no auto mode |
5 | 2-speed, no auto mode |
6 | 3-speed, no auto mode |
Modbus register: 41603;
BACnet object: MSV2, property: Present Value.
FAN_MODE_NAME: ten registers that allow to set a unique 4-letter name for each fan mode;
Modbus registers: 41604-41613;
BACnet object: MSV1, property: State.
FAN_ICON_FLASHING_TIME: contains a time value in milliseconds, which is the base for calculating a frequency of flashing run indication icons (setting a rotation speed of the run indication symbol). This register has a software limitation, where the minimum time value is 50 ms. By default, the time value is set to 500 ms (fan run indication icons change repeatedly with 2 Hz frequency).
Modbus register: 41615;
BACnet object: AO21, property: Present Value.
User Interface for Fan Control
It is possible to change the fan mode depending on the set fan type.
How to Change the Fan Mode on the Front Panel?
Press a fan button to enter an edit mode (display should start blinking with a current value);
Change the fan mode using - and + buttons;
To save a new value, press the occupancy/confirmation button.
More details: User-defined submenu