Drive Bypass - Danfoss VLT HVAC Basic Drive FC 100 Series Programming Manual

Parameters
24-00 FM Function
Option: Function:
[0] Disabled Fire Mode Function is not active.
[1] Enabled-Run In this mode, the motor will continue to
Forward operate in a clockwise direction.
[2] Enabled-Run In this mode, the motor will continue to
Reverse operate in a counter-clockwise direction.
[3] Enabled-Coast When this mode is enabled, the output is
disabled and the motor is allowed to
coast to stop.
[4] Enabled-Run
Fwd/Rev
NOTE!
In the above, alarms are produced or ignored in
accordance with the selection in 24-09 FM Alarm Handling.
24-05 FM Preset Reference
Range: Function:
0 % [-100 - 100 %] Enter the required preset reference/
*
setpoint 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 adjustable
Crit Alar 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).
[1] Trip, Critical In case of a critical alarm, the adjustable
Alarms frequency drive 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 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.
®
VLT HVAC Basic Drive Programming Guide
NOTE!
The setting in 14-20 Reset Mode is disregarded if Fire Mode
is active (see parameter group 24-0*, Fire Mode).
No:
4
7
8
9
13
14
16
29
33
38
65
68
Table 3.14

3.16.2 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 the event of a Fire Mode
Coast (see 24-00 FM 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!
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 adjustable
frequency drive!
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
messages. When the automatic Drive Bypass function is
enabled, it will cut in the external bypass according to the
below sequence:
®
MG18B222 - VLT is a registered Danfoss trademark
Critical
Description
Alarms
Mains ph. Loss
DC over volt x
DC under volt x
Inverter overloaded
Over current x
Earth fault x
Short circuit x
Power card temp
Inrush fault
Internal fault
Ctrl. card temp
SafeStop x
3 3
Warranty
Affecting
Alarms
x
x
x
x
x
x
3-63