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3.16 Main Menu - Application Functions 2 -

Group 24

3.16.1 24-0* Fire Mode

CAUTION

Please note the frequency converter is only one component
of the VLT HVAC Basic Drive 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 VLT HVAC Basic Drive 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, VLT HVAC Basic Drive 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 will show a status
message “Fire Mode” and a warning “Fire Mode”.
Once the Fire Mode is again deactivated, the status
messages will disappear and the warning will be replaced by
the warning “Fire M Was Active”. This message can only be
reset by power-cycling the frequency converter supply. If,
whilst the frequency converter is active in Fire Mode, a
warranty-affecting alarm (see

24-09 FM Alarm Handling

)

should occur, display will show the warning “Fire M Limits
Exceeded”.
Digital and relay outputs can be configured for the status
messages “Fire Mode Active” and the warning “Fire M Was
Active”. See parameter group5-3* and parameter group 5-4*.
“Fire M was Active” messages can also be accessed in the
warning word via serial communication. (See relevant
documentation).
The status messages “Fire Mode” can be accessed via the
extended status word.

Message

Type

LCP

Messages in display

Warning Word 2

Ext. Status Word 2

Fire Mode

Status

+ (bit 25)

Fire Mode

Warning

Fire M was Active

Warning

+ (bit 3)

Fire M Limits Exceeded

Warning

Log
An overview of events related to Fire Mode can be viewed in
the Fire Mode log, parameter group 18-1*.
The log will include up to 10 of the latest events. Warranty
Affecting Alarms will have a higher priority.
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
All other alarms occurring while Fire Mode activated will be
logged as usual.

NOTE

During Fire Mode operation all stop commands to the
frequency converter will be ignored, including Coast/Coast
inverse and External Interlock.

NOTE

If setting the command Start Reversing [11] on a digital input
terminal in

5-10 Terminal 18 Digital Input

, the FC will

understand this as a reversing command.

24-00 FM Function

Option: