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,
Critical
Alarms
If this mode is selected, the frequency
converter will continue to run, ignoring most
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
Alarms
In case of a critical alarm, the frequency
converter trips and does not auto-restart
(Manual Reset).
[2] Trip, All
Alarms/Test
It is possible to test the operation of Fire
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
Critical
Alarms
Warranty
Affecting
Alarms
4
Mains ph. Loss
x
7
DC over volt
x
8
DC under volt
x
9
Inverter overloaded
x
13
Over current
x
14
Earth fault
x
16
Short circuit
x
29
Power card temp
x
33
Inrush fault
x
38
Internal fault
x
65
Ctrl. card temp
x
68
Safe Stop
x
Table 3.12 Fire Mode Alarm Handling
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
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
.
NOTICE
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
130BA546.10
Operation
Alarm
Relay
"Bypass"
On delay (P5-41)
Speed
ON
OFF
Auto Resets
Auto Reset Disabled
Bypass
Delay
Timer
P24-11
Alarm
Illustration 3.16 Drive Bypass Function
Status can be read in the Extended Status Word 2, bit
number 24.
24-10 Drive Bypass Function
Option:
Function:
This parameter determines, which circum-
stances will activate the Drive Bypass
Function:
[0]
*
Disabled
[2]
Enabled (Fire
Mode only)
The Bypass Function operates at Trip at
Critical Alarms, Coast or Bypass Delay Timer
Parameters
VLT
®
HVAC Basic Drive FC 101 Programming Guide
MG18B302 - Rev. 2013-09-02
79
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