Drive Bypass - Danfoss VLT FC 102 Programming Manual

Parameter Descriptions
Alarm Description
Number
3 3
4 Mains phase loss
7 DC over voltage
8 DC under voltage
9 Inverter overloaded
13 Over Current
14 Ground fault
16 Short Circuit
29 Heat sink temp
33 Inrush fault
38 Internal fault
39 Heatsink sensor
65 Control Board Over temperature
68 Safe Stop
69 Pwr. Card Temp
244 Heatsink temp
245 Heatsink sensor
247 Pwr.card temp
Table 3.30 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.
232
®
VLT HVAC Drive FC 102
Fire mode alarm handling
selected in parameter 24-09 Fire Mode Alarm
Critical alarms causes a trip.
[0] Trip+Reset
ignored
Trip+Reset
Trip+Reset
ignored
Trip+Reset
Trip+Reset
Trip+Reset
ignored
ignored
ignored
ignored
ignored
Trip
ignored
ignored
ignored
ignored
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 3.72
Danfoss A/S © 10/2019 All rights reserved.
Handling
[1] Trip [2] Test
ignored (Warning / Trip)
Trip Warning / Trip
Trip Warning / Trip
ignored (Warning / Trip)
(Warning / Trip /
Trip
Trip lock)
(Warning / Trip /
Trip
Trip lock)
Trip (Trip /Trip lock)
(Warning / Trip /
ignored
Trip lock)
ignored Trip / Trip lock
ignored Trip / Trip lock
ignored (Trip / Trip lock)
Warning / Trip /
ignored
(Trip lock)
Trip Trip
ignored Trip / (Trip lock)
ignored (Trip / Trip lock)
ignored (Trip / Trip lock)
ignored (Trip / Trip lock)
Warranty-
affecting alarms
in fire mode
X
X
X
X
X
X
X
X
X
X
X
M0010001