Main Menu - Application Functions 2 - Group; Mg18B302 - Rev. 2013-09-02 - Danfoss VLT HVAC Basic Drive FC 101 Programming Manual

Parameters
3.16 Main Menu - Application Functions 2 -
Group 24
3.16.1 24-0* Fire Mode
CAUTION
3 3
Note that the frequency converter is only one
component of the 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 over pressure
and result in damage to the system and components,
hereunder 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,
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.
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 Fire Mode Function cause alarms and trip
conditions to be disregarded, enabling the motor to run
without interruption.
Activation
Fire Mode is activated only via Digital Input terminals. See
parameter group 5-1* Digital Inputs.
Messages in display
When Fire Mode is activated, the display shows a status
message "Fire Mode".
Once the Fire Mode is again deactivated, the status
message disappears.
If, while the frequency converter is active in Fire Mode, a
warranty-affecting alarm (see 24-09 FM Alarm Handling)
occurs, the display shows the status message "Fire Mode
Limits Exceeded". Once this status message appears, it
remains permanently, and cannot be removed.
Digital and relay outputs can be configured for the status
messages "Fire Mode Active". See parameter group 5-3*
Digital Outputs and parameter group 5-4* Relays.
The status messages "Fire Mode" and "Fire Mode Limits
Exceeded" can be accessed via the extended status word.
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VLT HVAC Basic Drive FC 101 Programming Guide
Message
Fire Mode
Fire Mode
Limits
Exceeded
Table 3.11 Fire Mode Display Messages
Log
An overview of events related to Fire Mode can be viewed
in the Fire Mode log, parameter group 18-1* Fire Mode Log.
The log includes up to 10 of the latest events. Fire Mode
Limits Exceeded has a higher priority than Fire Mode Active.
The log cannot be reset.
Following events are logged:
*Warranty affecting alarms (see 24-09 FM Alarm Handling,
Fire Mode Alarm Handling)
*Fire Mode Activated
*Fire Mode Limits Exceeeded
All other alarms occurring while Fire Mode activated are
logged as usual.
NOTICE
During Fire Mode operation all stop commands to the
frequency converter are ignored, including Coast/Coast
inverse and External Interlock.
NOTICE
If setting the command [11] Start Reversing on a digital
input terminal in 5-10 Terminal 18 Digital Input, the
frequency converter understands this as a reversing
command.
24-00 FM Function
Option:
[0] Disabled
*
[1] Enabled-Run
Forward
[2] Enabled-Run
Reverse
[3] Enabled-Coast
[4] Enabled-Run
Fwd/Rev
NOTICE
In the above, alarms are produced or ignored in
accordance with the selection in 24-09 FM Alarm
Handling.

MG18B302 - Rev. 2013-09-02

Warning
Type LCP Message
Word 2
Status + +
Status + +
Function:
Fire Mode Function is not active.
In this mode the motor will continue to
operate in a clockwise direction.
In this mode the motor will continue to
operate in a counter-clockwise direction.
Whilst this mode is enabled, the output is
disabled and the motor is allowed to
coast to stop.
Ext. Status
Word 2
+ (bit 25)