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VLT
®
6000 HVAC Series
Introduction to
HVAC
■
Fire mode
NB!:
Please note the frequency converter is
only one 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 may cause over
pressure and result in damage to HVAC system
and components, including dampers and air
ducts. The frequency converter itself may be
damaged and it may cause damage or fire.
Danfoss A/S 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
The Fire Mode function is made to ensure the VLT
6000 can run without interruption. This means most
alarms and warnings will not cause a trip and trip
lock is disabled. This is useful in case of fire or other
emergencies. Until the motor wires or the frequency
converter itself are destroyed every attempt is made
to keep running. A warning will flash when these
limits have been exceeded. If the warning still flashes
after a power cycle please contact your local Danfoss
supplier. In the following is a table to show the alarms
and when the frequency converter changes state
depending on selection in parameter 430. Trip and
lock ([0] in parameter 430) are valid in normal operation
mode. Fire Mode trip and reset ([1] or [2] in parameter
430) means that a reset is automatically performed
without the need of manual resetting. Go to Fire
Mode bypass ([3] in parameter 430) is valid in case
one of the mentioned alarms causes a trip. After the
in parameter 432 selected time delay has passed an
output is set. This output is programmed in parameter
319, 321, 323 or 326. If a relay option is fitted it can
also be selected in parameter 700, 703, 706 or 709.
In parameter 300 and 301 it can be selected if the
logic, for the Fire Mode activation, shall be active high
or low. Please note parameter 430 must be different
to [0] for the Fire Mode to be enabled.
To be able to use Fire Mode please also note that
input 27 must be "high" and no coast bit present via
fieldbus. To ensure that no coast can interrupt Fire
Mode via fieldbus please select Digital Input [0] in par.
503. Then coasting via fieldbus disabled.
MG.61.A5.02 - VLT is a registered Danfoss trademark
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