Danfoss VLT HVAC Drive FC 102, Руководство по программированию, Страница: 190 / 250

Num
ber
Description
Critical
alarms
Warranty-
affecting
alarms
4 Mains ph. Loss x
7 DC overvolt x
8 DC undervolt 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 3.28 Fire Mode Alarm Handling
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
parameter 24-00 Fire Mode Function ).
The bypass switches the motor to operation direct on line.
The external bypass is activated by 1 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
After enabling the drive bypass function, the frequency
converter is no longer safety certified (for using the safe
Torque Off in versions, where included).
To deactivate the drive bypass at normal operation (fire
mode not activated), carry out 1 of following actions:
•
Press [Off] on the LCP, (or program 2 of the digital
inputs for Hand On-Off-Auto).
•
Activate external interlock via digital input
•
Carry out a power cycling.
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 the
sequence in
Illustration 3.66
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 3.66 Drive Bypass
Status can be read in the extended status word 2, bit
number 24.
24-10 Drive Bypass Function
Option: Function:
NOTICE
After enabling the drive bypass function,
the Safe Torque Off function (in versions,
where included) is not complying with
standard EN 954-1, Cat. 3 installations
anymore.
This parameter determines which circumstances
activate the drive bypass function.
[0]
*
Disabled
[1] Enabled If in normal operation, the automatic drive
bypass function is activated under the following
conditions:
•
Incase of a trip lock or a trip.
•
After the programmed number of reset
attempts, programmed in
parameter 14-20 Reset Mode
•
if the Bypass Delay Timer
(
parameter 24-11 Drive Bypass Delay
Time ) expires before reset attempts
have been completed.
[2] Enabled
(Fire M
Only)
Parameter Descriptions
VLT
®
HVAC Drive FC 102
188 Danfoss A/S © 03/2015 All rights reserved. MG11CE02
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