Danfoss VLT FC 100 Series Programming Manual page 185

Parameter Description
24-09 Fire Mode Alarm Handling
Option:
[0] Trip+Reset,
3 3
Crit Alar
[1] Trip, Critical
*
Alarms
[2] Trip, All
Alarms/Test
NOTE!
Warranty-affecting alarms. Certain alarms can affect the
lifetime of the adjustable frequency drive. If one of these
disregarded alarms occurs while in Fire Mode, a log of the
event is stored in the Fire Mode Log.
This is where the 10 latest events caused by warranty-
affecting alarms, fire mode activation and fire mode
deactivation are stored.
NOTE!
The setting in 14-20 Reset Mode is disregarded if Fire Mode
is active (see parameter group 24-0*, Fire Mode).
No:
4 Mains ph. Loss
7
8
9 Inverter overloaded
13
14
16
29 Power card temp
33 Soft-charge fault
38
65 Ctrl. card temp
68
Table 3.33
3-158
Function:
If this mode is selected, the Adjustable
frequency drive will continue to run,
ignoring most alarms, even if doing so it
may result in damage of the adjustable
frequency drive. Critical alarms are alarms
which cannot be suppressed, but a restart
attempt is possible (Infinity Automatic
Reset).
In case of a critical alarm, the Adjustable
frequency drive will trip and not auto-restart
(Manual Reset).
It is possible to test the operation of fire
mode, but all alarm states are activated
normally (Manual Reset).
Critical
Description
Alarms
DC overvolt x
DC undervolt x
Overcurrent x
Earth fault x
Short circuit x
Internal fault
SafeStop x
MG11CD22 - VLT
®
VLT HVAC Drive Programming Guide
3.22.2 24-1* Drive Bypass
The Adjustable frequency drive includes a feature, which
can be used to automatically activate an external electro-
mechanical bypass in case of a trip/trip lock of the
adjustable frequency drive 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 Adjustable frequency
drive, when programmed in parameter group 5-3* or
parameter group 5-4*.
NOTE!
Important! After enabling the Drive Bypass Function, the
Adjustable frequency drive 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!
The drive bypass cannot be deactivated if in fire mode. It
can be deactivated only by either removing the Fire Mode
Warranty
command signal or the power supply to the Adjustable
Affecting
frequency drive!
Alarms
x
When the Drive Bypass function is activated, the display on
the LCP will show the status message Drive Bypass. This
message has a higher priority than the Fire Mode status
x
messages. When the automatic Drive Bypass function is
enabled, it will cut in the external bypass according to the
below sequence:
x
x
x
x
® 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 Power Cycling.