Main Menu - Application Functions 2 - Group - Danfoss VLT FC 100 Series Programming Manual

Parameter Description

3.22 Main Menu - Application Functions 2 - Group 24

3.22.1 24-0* Fire Mode
CAUTION
Please note the Adjustable frequency drive is only one
®
component of the VLT HVAC 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 adjustable
frequency drive due to Fire Mode operation could cause over
pressure and result in damage to VLT
and components, including dampers and air ducts. The
Adjustable frequency drive 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
Adjustable frequency drive itself or components herein, VLT
HVAC Drive systems and components herein or other property
when the Adjustable frequency drive 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 Adjustable frequency drive 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 adjustable frequency drive's normal protective
functions. These could be ventilation fans in tunnels or
Message
Fire Mode
Fire Mode
Fire M was Act.
Fire M Lim Exc.
Table 3.32
Log
An overview of events related to fire mode can be viewed
in the Fire Mode log, parameter group 18-1*, or via the
Alarm Log button on the LCP.
The log will include up to 10 of the latest events. Warranty
Affecting Alarms will have a higher priority than the two
other types of events.
The log cannot be reset!
Following events are logged:
*Warranty affecting alarms (see 24-09 Fire Mode Alarm
Handling, Fire Mode Alarm Handling)
*Fire Mode activated
*Fire Mode deactivated
®
VLT HVAC Drive Programming Guide
®
HVAC Drive system
®
Type LCP
Status +
Warning +
Warning +
Warning +
MG11CD22 - VLT ® is a registered Danfoss trademark
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 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 adjustable frequency drive
supply. If, while the Adjustable frequency drive is active in
Fire Mode, a warranty-affecting alarm (see 24-09 Fire Mode
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 group 5-3* 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.
Messages in display Warning Word 2
+
+ + (bit 3)
+
All other alarms occurring while fire mode activated will be
logged as usual.
NOTE!
During Fire Mode operation all stop commands to the
Adjustable frequency drive will be ignored, including
Coast/Coast inverse and External Interlock. However, if your
Adjustable frequency drive incorporates "Safe-Stop", this
function is still active. See Section "How to Order /
Ordering Form Type Code".
3
Ext. Status Word 2
+ (bit 25)
3-155
3