Danfoss VLT FC 100 Series Programming Manual page 203

®
VLT HVAC Drive Programming Guide
NB!
During Fire Mode operation all stop commands to the frequency converter will be ignored, including Coast/Coast inverse and External
Interlock. However, if your frequency converter incorporates "Safe-Stop", this function is still active. See Section "How to Order /
Ordering Form Type Code"
NB!
If in Fire Mode it is desired to use the Live Zero function, then it will also be active for analog inputs other than that used for Fire Mode
setpoint / feedback. Should the feedback to any of those other analog inputs be lost, for example a cable is burned , Live Zero function
will operate. If this is undesirable then Live Zero function must be disabled for those other inputs.
Desired Live Zero function in case of missing signal when Fire Mode active, must be set in
Function.
Warning for Live Zero will have a higher priority than the warning "Fire Mode"
24-00 Fire Mode Function
Option:
*
Disabled
[0]
[1] Enable - Run
[2] Enable - Run Reverse
[3] Enable - Coast
NB!
In the above, alarms are actioned or ignored in accordance with the selection in
24-01 Fire Mode Configuration
Option:
*
Open Loop
[0]
[3] Closed Loop
In both Open Loop and Closed Loop the Reference/Set Point will be determined by either the internal value selected in
Reference
or an external signal via the source selected in
NB!
The PID controller can be adjusted with
NB!
If Enable-Run Reverse is selected in par. 24-00, Closed Loop cannot be selected in par. 24-01.
Function:
Fire Mode Function is not active.
In this mode the motor will continue to operate in a clockwise direction. Speed will depend on what selected in
par 24-01, Fire Mode Configuration .
In this mode the motor will continue to operate in a counter-clockwise direction. Works only in Open Loop. See
par 24-01, Fire Mode Configuration .
Whilst this mode is enabled, the output is disabled and the motor is allowed to coast to stop.
Function:
When Fire Mode is active, the motor will run with a fixed speed based on a Reference set. Unit will be the same
par. 0-02, Motor Speed Unit
as selected in
When Fire Mode is active, the build in PID controller will control the speed based on the set point and a feed
par. 24-07, Fire Mode Feedback Source
back signal, selected in
Unit
. If the motor also is controlled by the build in PID controller when in normal operation, the same transmitter
can be used for both cases by selecting the same source.
par. 24-06, Fire Mode Reference Source
par. 24-09, Fire Mode Alarm Handling
MG.11.C5.02 - VLT ® is a registered Danfoss trademark
3. Parameter Description
par. 6-02, Fire Mode Live Zero Timeout
par 24-09, Fire Mode Alarm Handling
.
. Unit to be selected in
.
, [2] Trip, All Alarms/Test.
.
par. 24-02, Fire Mode
par. 24-05, Fire Mode Preset
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