Fire Mode application
Confidential / Property of
Danfoss Drives A/S
Fire Mode application
◊ Fire Mode is for use in critical
situations when the drive must
perform the desired function
● Stairwell pressurization fans
● Ventilation fans in tunnels
◊ Drive operation
● In many cases, the drive will continue
to run
● In cases like output short circuits, it
may trip off and immediately restart
VLT®HVAC Drive
Confidential / Property of Danfoss Drives A/S
November, 2007
Andrzej Sokolowski PLCO
2
Fire Mode
Introduction
◊ Is activated by a digital input
◊ It ignores
● Other digital inputs
● External interlocks
● Input from the keypad
◊ It can be programmed to ignore or
automatically reset
● Alarms
● Motor overload indications
VLT®HVAC Drive
Confidential / Property of Danfoss Drives A/S
November, 2007
Andrzej Sokolowski PLCO
3
Fire Mode
Display Indications
◊ When it is active, its display will
show
● Fire Mode
This is to indicate that Fire Mode is
active and normal methods of drive
control as disabled
VLT®HVAC Drive
Confidential / Property of Danfoss Drives A/S
November, 2007
Andrzej Sokolowski PLCO
4
Fire Mode
Display Indications
◊ After Fire mode has been turned
off, the drive’s display will show
either:
● Fire M Was Active
or
● Fire M Limits Exceeded
(If it ignored a critical alarm)
◊ This display is turned off by cycling
power to the drive
VLT®HVAC Drive
Confidential / Property of Danfoss Drives A/S
November, 2007
Andrzej Sokolowski PLCO
5
Fire Mode
Introduction
◊ History of the operation of Fire
Mode is stored in the Fire Mode Log
(parameters 18-1*)
◊ This can be used when considering
a warranty claim for a drive
VLT®HVAC Drive
Confidential / Property of Danfoss Drives A/S
November, 2007
Andrzej Sokolowski PLCO
6
Action
24-00 Fire Mode Function
[0]*
[1]
[2]
[3]
Disabled
Enable – Run
Enable – Run Reverse
Enable – Coast
VLT®HVAC Drive
Confidential / Property of Danfoss Drives A/S
November, 2007
Andrzej Sokolowski PLCO
7
Speed Control Method
24-01 Fire Mode Configuration
[0] Open Loop
[1]* Closed Loop
VLT®HVAC Drive
Confidential / Property of Danfoss Drives A/S
November, 2007
Andrzej Sokolowski PLCO
8
Setting up speed control
24-02 Fire Mode Unit
[0] None
[1]* %
…
24-03 Fire Mode Min Reference
24-04 Fire Mode Max Reference
VLT®HVAC Drive
Confidential / Property of Danfoss Drives A/S
November, 2007
Andrzej Sokolowski PLCO
9
How Fast Should the Motor Run?
24-05 Fire Mode Preset Reference
● For Open Loop or Closed Loop
operation
24-06 Fire Mode Reference Source
● For Open Loop or Closed Loop
operation
24-07 Fire Mode Feedback Source
● For Closed Loop operation
VLT®HVAC Drive
Confidential / Property of Danfoss Drives A/S
November, 2007
Andrzej Sokolowski PLCO
10
How should alarms be handled?
24-09 Fire Mode Alarm Handling
[0]
Trip + reset, Critical Alarms
This is how Fire Mode is most
often expected to operate
Caution! Resetting a critical
alarm during Fire Mode
operation can impact the
drive’s warranty
[1]* Trip, Critical Alarms
[2] Trip, All Alarms/Test
VLT®HVAC Drive
Confidential / Property of Danfoss Drives A/S
November, 2007
Andrzej Sokolowski PLCO
11
What are Critical Alarms?
◊ 4
Mains Phase Loss
◊ 9
Inverter Overloaded
◊ 29
Drive Over Temperature
◊ 33
Inrush Fault
◊ 65
Control Card Over Temperature
VLT®HVAC Drive
Confidential / Property of Danfoss Drives A/S
November, 2007
Andrzej Sokolowski PLCO
12
Bypass and Fire Mode
24-11 Bypass Delay Function
0 s* [0 – 600 s]
The bypass function will
wait this to see if the drive
can recover from an alarm
before activating the bypass
relay
VLT®HVAC Drive
Confidential / Property of Danfoss Drives A/S
November, 2007
Andrzej Sokolowski PLCO
13
Fire Mode – ventilation in garage
BMS system
VLT HVAC Drive
Fire Mode Binary signal
start/stop
reference dirrection
PLC Fire controler
speed reference signal
I/O CARD
Mains
3x400V+PE
Smoke Smoke Smoke
sensor sensor sensor
Zone 1 Zone 2 Zone 3
Contactor
power off
Contactor
by-pass
Sevice circuit
breaker
Pressure
Transsmitter
motor cable
smoke fan
VLT®HVAC Drive
Confidential / Property of Danfoss Drives A/S
November, 2007
Andrzej Sokolowski PLCO
14
Fire Mode – pressurization system (open loop)
VLT HVAC Drive
BMS system
Fire Mode Binary signal
start/stop
reference dirrection
PLC Frire controler
speed reference signal
I/O CARD
Mains
3x400V+PE
Smoke sensor
Zone 1
Sevice circuit
breaker
Pressure
Transsmitter
Pressure
Transsmitter
motor cable
wentylator
napowietrzający
VLT®HVAC Drive
Confidential / Property of Danfoss Drives A/S
November, 2007
Andrzej Sokolowski PLCO
15
Fire mode – pressurization system (clouse loop)
BMS system
VLT HVAC Drive
Fildbus
LON, BACnet, ModbusRTU
Fire Mode Binary signal
start/stop
Analogue signals
Mains
3x400V+PE
Smoke sensor
Pressure
Transmitter
Sevice circuit
breaker
Pressure
Transsmitter
motor cable
air supply fan
VLT®HVAC Drive
Confidential / Property of Danfoss Drives A/S
November, 2007
Andrzej Sokolowski PLCO
16