Table of Contents
Advertisement
VLT® HVAC Drive FC 131
Programming Guide
Table 411: Range:
Min: -400.0 Hz
4.18 Parameter Group 24-** Appl. Functions 2
4.18.1 24-0* Fire Mode
EQUIPMENT DAMAGE AND PERSONAL INJURY
Non-interruption of the drive due to fire mode operation could cause overpressure and damage the system and its components,
including dampers, and air ducts. The drive itself could be damaged and it may cause damage or fire.
-
Ensure that the system is properly designed and components used are carefully selected.
-
Ensure that the ventilation systems working in life safety applications are approved by the local fire authorities.
Background
Fire mode is for use in critical situations, where it is imperative for the motor to keep running, regardless of the drive's normal pro-
tective functions. These situations could be ventilation fans in tunnels or stairwells for instance, where continued operation of the
fan facilitates safe evacuation of personnel in case of a fire. Some selections of fire mode function cause alarms and trip conditions
to be ignored, 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 shows the status message Fire Mode. Once the fire mode is deactivated, the status message
disappears.
If an alarm with warranty implications (see parameter 24-09 FM Alarm Handling) occurs while the drive is active in fire mode, the
display shows the status message Fire Mode Limits Exceeded. Once this status message appears in the display, it remains until a pow-
er cycle is performed. The drive automatically logs and stores the condition in the memory and the warranty is still lost in case the
drive is returned for service. Digital and relay outputs can be configured for the status messages Fire Mode Active. See parameter
group 5-3* Digital Outputs and parameter group 5-4* Relays. Access the status messages Fire Mode and Fire Mode Limits Exceeded via
the extended status word.
Table 412: Fire Mode Display Messages
Message
Fire Mode
Fire Mode Limits Exceeded
Log
The fire mode log shows an overview of events related to fire mode in the fire mode log, see also parameter group 18-1* Fire Mode
Log. The log includes up to 10 of the latest events. Fire Mode Limits Exceeded has a higher priority than Fire Mode Active. The log
cannot be reset.
The following events are logged:
•
Fire mode activated.
•
Fire mode limits exceeded (warranty-affecting alarms).
All other alarms occurring while fire mode is active are logged as usual.
During fire mode operation, all stop commands to the drive are ignored, including coast, coast inverse, and external interlock.
170 | Danfoss A/S © 2022.05
Max: 400.0 Hz
C A U T I O N
Type
LCP
Message
Status
+
+
Status
+
+
N O T I C E
Default value: 50 Hz
Warning word 2
Extended status word 2
+(bit 25)
+(bit 27)
AU370727746889en-000101 / 130R0994
Parameters
Advertisement
Table of Contents
