Danfoss VLT Programming Manual page 166

Parameter Description
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 will trip and 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).
NOTE
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.
NOTE
The setting in 14-20 Reset Mode is disregarded in case of Fire
Mode being active (see par. 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 SafeStop
®
VLT HVAC Drive Programming Guide
3.22.2 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 a trip/trip lock of the frequency
converter or the event of a Fire Mode Coast (see 24-00 Fire
Mode Function).
The bypass will switch 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* or parameter group
5-4*.
NOTE
Important! After enabling the Drive Bypass Function, the
frequency converter is no longer Safety Certified (for using
the Safe Stop in versions, where included).
To deactivate the Drive Bypass at normal operation (Fire
Mode not activated), one of following actions must be
carried out:
NOTE
Warranty
The Drive Bypass cannot be deactivated if in Fire Mode. It
Critical
Affecting
can be deactivated only by either removing the Fire Mode
Alarms
Alarms
command signal or the power supply to the frequency
x
converter!
x
x
When the Drive Bypass function is activated, the display on
x
the LCP will show the status message Drive Bypass. This
x
message has a higher priority than the Fire Mode status
x
messages. When the automatic Drive Bypass function is
x
enabled, it will cut in the external bypass according to the
x
below sequence:
x
x
x
x
®
MG.11.CB.02 - VLT is a registered Danfoss trademark
•
Press the Off button on the LCP, (or program two of
the digital inputs for Hand On-Off-Auto).
•
Activate External Interlock via digital input
•
Carry out a Power Cycling.
3 3
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