Parameters 24-** Application Functions 2 - Danfoss VLT AQUA Drive FC 202 Programming Manual

Parameter Description

3.21 Parameters 24-** Application Functions 2

3.21.1 24-0* Emergency Mode
CAUTION
3 3
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
Emergency Mode
Emergency Mode
Emergency M was Active
Emergency M Limits
Exceeded
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.
202
®
VLT AQUA Drive FC 202
Type LCP
Status +
Warning +
Warning +
Warning +
Danfoss A/S © 05/2018 All rights reserved.
Messages in
Warning word 2
display
+ –
– –
+ + (bit 3)
+ –
Ext. status word 2
+ (bit 25)
–
–
–
MG20OB02