Danfoss VLT HVAC Basic Drive FC 101 Programming Manual page 81

Parameters
24-05 FM Preset Reference
Range: Function:
0 % [-100 - 100 Enter the required preset reference/set point
*
%] as a percentage of the Fire Mode Max
Reference set in Hz.
24-09 Fire Mode Alarm Handling
Option: Function:
[0] Trip+Reset, If this mode is selected, the frequency
Critical converter will continue to run, ignoring most
Alarms alarms, even if doing so it may result in
damage of the frequency converter. Critical
alarms are alarms, which cannot be suppressed
but a restart attempt is possible (Infinity
Automatic Reset).
[1] Trip, Critical In case of a critical alarm, the frequency
Alarms converter trips and does not auto-restart
(Manual Reset).
[2] Trip, All It is possible to test the operation of Fire
Alarms/Test Mode, but all alarm states are activated
normally (Manual Reset).
NOTICE
Warranty-affecting alarms. Certain alarms can affect the
lifetime of the frequency converter. Should one of these
ignored alarms occur whilst in Fire Mode, a log of the
event is stored in the Fire Mode Log.
Here the 10 latest events of warranty-affecting alarms,
fire mode activation and fire mode deactivation are
stored.
NOTICE
The setting in 14-20 Reset Mode is disregarded in case of
Fire Mode being active (see parameter group 24-0* Fire
Mode).
No Description
4 Mains ph. Loss
7 DC over volt
8 DC under volt
9 Inverter overloaded
13 Over current
14 Earth fault
16 Short circuit
29 Power card temp
33 Inrush fault
38 Internal fault
65 Ctrl. card temp
68 Safe Stop
Table 3.12 Fire Mode Alarm Handling
®
VLT HVAC Basic Drive FC 101 Programming Guide
3.16.2 24-1* Drive Bypass
The frequency converter includes a feature, which can be
used to automatically activate an external electro-
mechanical bypass in case of the event of a Fire Mode
Coast (see 24-00 FM Function).
The bypass switches the motor to operation direct on line.
The external bypass is activated by means of one of the
digital outputs or relays in the frequency converter, when
programmed in parameter group 5-3* Digital Outputs or
parameter group 5-4* Relays.
The Drive Bypass cannot be deactivated if in Fire Mode.
It can be deactivated only by either removing the Fire
Mode command signal or the power supply to the
frequency converter!
When the Drive Bypass function is activated, the display on
the LCP shows the status message Drive Bypass. This
message has a higher priority than the Fire Mode status
messages. When the automatic Drive Bypass function is
enabled, it cuts in the external bypass according to
Illustration 3.16
Warranty
Critical
Affecting
Alarms
Alarms
x
x
x
Status can be read in the Extended Status Word 2, bit
x
number 24.
x
x
x
x
x
x
x
x
MG18B302 - Rev. 2013-09-02
NOTICE
Alarm Auto Resets
Speed
Operation
Alarm
Bypass
Delay
Timer
P24-11
ON
Relay
"Bypass"
OFF
Illustration 3.16 Drive Bypass Function
24-10 Drive Bypass Function
Option: Function:
This parameter determines, which circum-
stances will activate the Drive Bypass
Function:
[0] Disabled
*
[2] Enabled (Fire The Bypass Function operates at Trip at
Mode only) Critical Alarms, Coast or Bypass Delay Timer
3
Auto Reset Disabled
On delay (P5-41)
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