3.21 Parameters 24-** Application Functions 2
3.21.1 24-0* Emergency Mode
CAUTION
Note that the frequency converter is only 1 component of the system. Correct function of emergency mode depends on
the correct design and selection of system components. Ventilation systems working in life safety applications must be
approved by the local emergency authorities. Non-interruption of the frequency converter due to emergency mode
operation could cause overpressure and damage the system and components, including dampers and air ducts. The
frequency converter itself could be damaged and become a source of danger. Danfoss accepts no responsibility for
errors, malfunctions personal injury, or any damage to the frequency converter itself or components herein, pump
systems and components herein, or other property when the frequency converter 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 frequency converter being
programmed and operated in emergency mode.
Background
Emergency mode is for use in critical situations, where it is imperative for the motor to keep running, regardless of the
frequency converter’s normal protective functions. 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 is activated only via digital input terminals. See parameter group
5-1* Digital Inputs
.
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 again deactivated, the status messages disappear and the warning is replaced by the warning
Emergency M Was Active
. This message can only be reset by power-cycling the frequency converter supply. If a warranty-
affecting alarm (see
parameter 24-09 Emergency Mode Alarm Handling
) should occur while the frequency converter is active
in emergency mode, the display shows the warning
Emergency M Limits Exceeded
.
Digital and relay outputs can be configured for the status messages
Emergency Mode Active
and the warning
Emergency M
Was Active
. See parameter group
5-3* Digital Outputs
and parameter group
5-4* Relays
.
Emergency M was Active
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.
Message
Type
LCP
Messages in
display
Warning word 2
Ext. status word 2
Emergency Mode
Status
+
+
–
+ (bit 25)
Emergency Mode
Warning
+
–
–
–
Emergency M was Active
Warning
+
+
+ (bit 3)
–
Emergency M Limits
Exceeded
Warning
+
+
–
–
Table 3.32 Messages in Display
Log
To see an overview of 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 log cannot be reset.
The following events are logged:
•
Warranty-affecting alarms (see
parameter 24-09 Emergency Mode Alarm Handling
•
Emergency mode activated.
•
Emergency mode deactivated.
All other alarms occurring while emergency mode is activated are logged as usual.
Parameter Description
VLT
®
AQUA Drive FC 202
202
Danfoss A/S © 05/2018 All rights reserved.
MG20OB02
3
3
Summary of Contents for VLT AQUA Drive FC 202
Page 2: ......