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 par. 6-02
Fire Mode Live Zero Timeout
Function
.
Warning for Live Zero will have a higher priority than the warning “Fire Mode”.
NB!
If setting the command Start Reversing [11] on a digital input terminal in par. 5-10
Terminal 18 Digital Input
, the FC will understand
this as a reversing command.
24-00 Fire Mode Function
Option: Function:
[0] * Disabled Fire Mode Function is not active.
[1] Enabled - Run Forward In this mode the motor will continue to operate in a clockwise direction. Works only in Open Loop.
Set par. par. 24-01
Fire Mode Configuration
to Open Loop [0].
[2] Enabled - Run Reverse In this mode the motor will continue to operate in a counter-clockwise direction. Works only in Open
Loop. Set par. 24-01
Fire Mode Configuration
to Open Loop [0].
[3] Enabled - Coast Whilst this mode is enabled, the output is disabled and the motor is allowed to coast to stop.
[4] Enabled - Run Fwd/Rev
NB!
In the above, alarms are produced or ignored in accordance with the selection in par. 24-09
Fire Mode Alarm Handling
.
24-01 Fire Mode Configuration
Option: Function:
[0] * Open Loop When Fire Mode is active, the motor will run with a fixed speed based on a Reference set. Unit will
be the same as selected in par. 0-02
Motor Speed Unit
.
[3] Closed Loop When Fire Mode is active, the build in PID controller will control the speed based on the set point
and a feed back signal, selected in par. 24-07
Fire Mode Feedback Source
. Unit to be selected in
par. 24-02
Fire Mode Unit
. For other PID controller settings use parameter group 20-** as for normal
operation. 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.
NB!
Before adjusting the PID controller set par. 24-09
Fire Mode Alarm Handling
, [2] Trip, All Alarms/Test.
VLT
®
HVAC Drive Programming Guide 3 Parameter Description
MG.11.C9.02 - VLT
®
is a registered Danfoss trademark
233
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