Danfoss VLT HVAC Basic Drive FC 101 Programming Guide

24-09 Fire Mode Alarm Handling
Option: Function:
[0] Trip+Reset,
Critical
Alarms
If this mode is selected, the frequency
converter continues to run, ignoring most
alarms, even if doing so may damage the
frequency converter. Critical alarms are
alarms that cannot be suppressed but a
restart attempt is possible (innity 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 re
mode, but all alarm states are activated
normally (manual reset).
NOTICE
Certain alarms can aect the lifetime of the frequency
converter. If 1 of these ignored alarms occurs while in
re mode, a log of the event is stored in the re mode
log.
In re mode log, the 10 latest events of alarms that
aect warranty, re mode activation, and re mode
deactivation are stored.
NOTICE
The setting in parameter 14-20 Reset Mode is disregarded
if re mode is active (see parameter group 24-0* Fire
Mode).
Num
ber
Description
Critical
alarms
Warranty
aecting
alarms
4 Mains ph. Loss x
7 DC over volt x x
9 Inverter overloaded x
13 Overcurrent x x
14 Ground fault x x
16 Short circuit x x
38 Internal fault x
69 Power card temp x
Table 3.14 Fire Mode Alarm Handling
3.16.2 24-1* Drive Bypass
If a re mode coast occurs (see parameter 24-00 FM
Function), the frequency converter includes a feature that
can automatically activate an external electro-mechanical
bypass.
The bypass switches the motor to operation directly on
line. One of the digital outputs or relays in the frequency
converter activates the external bypass, when programmed
in parameter group 5-3* Digital Outputs or parameter group
5-4* Relays.
NOTICE
The drive bypass cannot be deactivated if in re mode. It
is deactivated only by either removing the re mode
command signal or the 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 re mode status
messages. When the automatic drive bypass function is
enabled, it cuts in the external bypass according to
Illustration 3.18.
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 3.18 Drive Bypass Function
Read the status in the extended status word 2, bit number
24.
24-10 Drive Bypass Function
Option: Function:
This parameter determines which circum-
stances activate the bypass function:
[0] * Disabled
[2] Enabled (Fire
Mode only)
If the timer expires before reset attempts
have completed, the bypass function
operates a trip at critical alarms, coast, or
bypass delay timer.
Parameters
VLT
®
HVAC Basic Drive FC 101
96 Danfoss A/S © 04/2018 All rights reserved. MG18B502
33

Danfoss VLT HVAC Basic Drive FC 101 Specifications

General

Brand	Danfoss
Model	VLT HVAC Basic Drive FC 101
Category	DC Drives
Language	English