Fire Mode - Danfoss VLT 6000 HVAC Series Design Manual

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 ap-
proved 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, in-
cluding dampers and air ducts. The fre-
quency converter itself may be dam-
aged and it may cause damage or fire.
Danfoss A/S accepts no responsibility
for errors, malfunctions personal in-
jury or any damage to the frequency
converter itself or components herein,
HVAC systems and components here-
in or other property when the frequen-
cy 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
12
®
VLT 6000 HVAC Series
to the frequency converter being pro-
grammed 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 emer-
gencies. Until the motor wires or the frequency con-
verter 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 sup-
plier. In the following is a table to show the alarms and
when the frequency converter changes state depend-
ing 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 men-
tioned 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 pa-
rameter 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.B5.02 - VLT is a registered Danfoss trademark