5.22 Parameter Group 24-** Application Functions 2
5.22.1 24-0* Emergency Mode
C A U T I O N
The drive is only 1 component of an entire application system. Correct function of emergency mode depends on the correct de-
sign and selection of system components. Non-interruption of the drive due to emergency-mode operation could cause over-
pressure and damage the system and components. The drive itself could be damaged, or may cause damage or fire. Danfoss
accepts no responsibility for errors, malfunctions, personal injury, or any damage to the drive itself or the components herein,
application systems and components herein, or other property when the drive has been programmed for emergency 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 drive being programmed and operated in emergency mode. Danfoss war-
ranty is only affected or reduced if a critical alarm occurs during emergency-mode operation, and the drive is programmed to
continue even though the application system would be damaged eventually.
If critical alarms have been activated during emergency mode operation, the drive informs the user that its performance and expec-
ted lifetime may be affected (W280), where an inspection of the drive may be needed to secure maximum operation in a new critical
situation.
Background
Emergency mode is for use in critical situations where it is imperative for the motor to keep running, regardless of the normal pro-
tective functions of the drive. These situations could be ventilation fans in tunnels or stairwells, for instance, where continued oper-
ation of fan facilitates safe evacuation of personnel and protection of inventory if a fire occurs. Some selections of the emergency-
mode function cause alarms and trip conditions to be disregarded, enabling the motor to run without interruption.
Activation
Emergency mode can be activated via digital input and/or over the fieldbus network. In digital activation, normal or inverse signals
levels can be selected as continual fixed signals or as trigger pulse activation to fit the overall fire control system. It can operate in
open loop with up to 8 different preset speeds or in closed loop with an external signal reference and feedback source. See parame-
ter group 5-1* Digital Inputs and parameter 24-43 Emergency Mode Signal Operation.
Messages in display
When emergency mode is activated, the display shows a status message Emergency Mode and a warning Emergency Mode. Once the
emergency mode is deactivated, the status messages disappears and the warning is replaced by the warning Emergency M Was
Active.
Digital and relay outputs can be configured for the status emergency mode messages, see parameter group 5-3* Digital Outputs and
parameter group 5-4* Relays. Emergency mode messages can also be accessed in the warning word via serial communication (see
relevant documentation). Access the status messages Emergency Mode via the extended status word.
Table 1036: Messages in Display
W202 Emerg. M Limits Excee-
ded
W280 Emcy M Service Warn-
ing
Log
To see an overview of the emergency mode-related events, view the emergency mode log, parameter group 18-1* Emergency Mode
Log, or press [Alarm Log] on the LCP. The log includes up to 10 of the latest events. Warranty-affecting alarms have a higher priority
than the other 2 types of events.
The emergency mode alarm log can only be reset by a Danfoss authorized service partner. To secure the emergency mode opera-
tion documentation, the 1
st
critical alarms can never be removed.
AU275636650261en-000101 / 130R0334562 | Danfoss A/S © 2022.12
Parameter Descriptions
VLT AutomationDrive FC 301/302
Programming Guide
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