Danfoss vlt FC 102 - Fire Mode; Parameters: 24-** Application Functions 2

3.22 Parameters: 24-** Application Functions 2
3.22.1 24-0* Fire Mode
CAUTION
The frequency converter is only 1 component of the HVAC system. Correct function of re mode depends on the correct
design and selection of system components. Ventilation systems working in life safety applications have to be approved
by the local re authorities. Non-interruption of the frequency converter due to re mode-operation could cause
overpressure and result in damage to the HVAC system and components, including dampers and air ducts. The
frequency converter itself could be damaged, and it may cause damage or re. Danfoss accepts no responsibility for
errors, malfunctions, personal injury, or any damage to the frequency converter itself or components herein, HVAC
systems and components herein, or other property when the frequency converter has been programmed for re mode.
In no event, shall Danfoss be liable to the end user or any other party for any direct or indirect, special or consequential
damage, or loss suered by such party, which has occurred due to the frequency converter being programmed and
operated in re mode. Danfoss warranty is only aected or reduced if a critical alarm arises during Fire Mode operation,
and the frequency converter is programmed to continue even though the HVAC system would be damaged eventually.
Background
Fire mode is for use in critical situations, where it is imperative for the motor to keep running, regardless of the frequency
converter’s normal protective functions. These could be ventilation fans in tunnels or stairwells for instance, where
continued operation of the fan facilitates safe evacuation of personnel in the event of a re. Some selections of the re
mode function cause alarms and trip conditions to be disregarded, enabling the motor to run without interruption.
Activation
Fire mode can be activated via digital input and/or over the eldbus network. It can operate in open loop with up to 8
dierent preset speeds or in close loop with a external signal reference and feedback source. See parameter group 5-1*
Digital inputs, parameter 24-06 Fire Mode Reference Source , and parameter 24-07 Fire Mode Feedback Source.
Messages in display
When re mode is activated, the display shows a status message Fire Mode and a warning Fire Mode.
Once the re mode is again deactivated, the status messages disappears and the warning is replaced by the warning Fire M
Was Active.
•
Upto 5.41 software version, this message can only be reset by power-cycling the frequency converter supply. If a
warranty-aecting alarm (see parameter 24-09 Fire Mode Alarm Handling) should occur while the frequency
converter is active in re mode, the display shows the warning Fire M Limits Exceeded.
•
From 5.41 software version onwards, the message is automatically reset in the LCP after the re mode has been
disabled for 1 minute.
Digital and relay outputs can be congured for the status messages Fire Mode Active and the warning Fire M Was Active. See
parameter group 5-3* Digital Outputs and parameter group 5-4* Relays.
Fire M was Active messages can also be accessed in the warning word via serial communication. (See relevant documen-
tation).
Access the status messages Fire Mode via the extended status word.
Message Type LCP
Messages in
display
Warning word 2 Ext. status word 2
Fire Mode Warning + + + (bit 25)
Fire M was Active Warning + + + (bit 3)
Fire M Limits Exceeded Alarm + +
Table 3.29 Messages in Display
Log
To see an overview of
re mode-related events, view the re mode-log, 18-1*, Fire mode log, or press [Alarm Log] on the LCP
or via the Alarm Log button on the LCP.
The log includes up to 10 of the latest events. Warranty-aecting alarms have a higher priority than the other 2 types of
events.
The log cannot be reset
Following events are logged:
Parameter Descriptions Programming Guide
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