Danfoss VLT AHF 005 Programming Guide

3.22 Parameters: 24-** Application Functions 2
3.22.1 24-0* Fire Mode
CAUTION
Note the frequency converter is only 1 component of the VLT
®
HVAC Drive system. Correct function of re mode
depends on the correct design and selection of system components. Ventilation systems working in life safety
applications have to be approved by the local re authorities. Non-interruption of the frequency converter due to re
mode-operation could cause overpressure and result in damage to VLT
®
HVAC Drive system and components, including
dampers and air ducts. The frequency converter itself could be damaged and it may cause damage or re. Danfoss
accepts no responsibility for errors, malfunctions personal injury, or any damage to the frequency converter itself or
components herein, VLT
®
HVAC Drive systems and components herein, or other property when the frequency converter
has been programmed for re 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 suered by such party, which has occurred due to the
frequency converter being programmed and operated in re mode.
Background
Fire 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. These could be ventilation fans in tunnels or stairwells for instance, where
continued operation of the fan facilitates safe evacuation of personnel in the event of a re. Some selections of the re
mode function cause alarms and trip conditions to be disregarded, 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 re mode is activated, the display shows a status message Fire Mode and a warning Fire Mode.
Once the re mode is again deactivated, the status messages disappears and the warning is replaced by the warning Fire M
Was Active. This message can only be reset by power-cycling the frequency converter supply. If a warranty-aecting alarm
(see parameter 24-09 Fire Mode Alarm Handling) should occur while the frequency converter is active in
re mode, the
display shows the warning Fire M Limits Exceeded.
Digital and relay outputs can be congured for the status messages Fire Mode Active and the warning Fire M Was Active. See
parameter group 5-3* Digital Outputs and parameter group 5-4* Relays.
Fire M was Active messages can also be accessed in the warning word via serial communication. (See relevant documen-
tation).
Access the status messages Fire Mode via the extended status word.
Message Type LCP
Messages in
display
Warning word 2 Ext. status word 2
Fire Mode Status + + + (bit 25)
Fire Mode Warning +
Fire M was Active Warning + + + (bit 3)
Fire M Limits Exceeded Warning + +
Table 3.27 Messages in Display
Parameter Descriptions
VLT
®
HVAC Drive FC 102
184 Danfoss A/S © 03/2015 All rights reserved. MG11CE02
33

Danfoss VLT AHF 005 Specifications

General

Brand	Danfoss
Model	VLT AHF 005
Category	DC Drives
Language	English