Fire Mode; Parameters: 24-** Application Functions 2 - Danfoss VLT FC 102 Programming Manual

Parameter Descriptions

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 fire 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 fire authorities. Non-interruption of the frequency converter due to fire 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 fire. 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 fire 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 suffered by such party, which has occurred due to the frequency converter being programmed and
operated in fire mode. Danfoss warranty is only affected 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 fire. Some selections of the fire
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 fieldbus network. It can operate in open loop with up to 8
different 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 fire mode is activated, the display shows a status message Fire Mode and a warning Fire Mode.
Once the fire 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-affecting alarm (see parameter 24-09 Fire Mode Alarm Handling) should occur while the frequency
converter is active in fire 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 fire mode has been
disabled for 1 minute.
Digital and relay outputs can be configured 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
Fire Mode
Fire M was Active
Fire M Limits Exceeded
Table 3.29 Messages in Display
Log
To see an overview of fire mode-related events, view the fire 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-affecting alarms have a higher priority than the other 2 types of
events.
The log cannot be reset
Following events are logged:
M0010001
Programming Guide
Type LCP
Warning +
Warning +
Alarm +
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Messages in
Warning word 2
display
+
+ + (bit 3)
+
3
Ext. status word 2
+ (bit 25)
227
3