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•
•
•
Alarm
number
Description
Emergency mode alarm handling selected in
parameter 24-09
Emergency Mode Alarm Handling
. Critical alarms cause a trip.
Warranty-
affecting
alarms in
emergency
mode
245
Heatsink sensor
Ignore
Ignore
(Trip/trip lock)
X
247
Pwr.card temp
Ignore
Ignore
(Trip/trip lock)
X
280
Emergency m service warn-
ing
Ignore
Ignore
281
Emcy OPR unexpected
Ignore
Ignore
5.22.2 24-1* Drive Bypass
The drive includes a feature which can be used to automatically activate an external electro-mechanical bypass if the drive trips or if
there is an emergency-mode coast (see
parameter 24-00 Emergency Mode Function
).
The bypass switches the motor top operation direct on line. The external bypass is activated by 1 of the digital outputs or relays in
the drive when programmed in
parameter group 5-3* Digital Outputs
or
parameter group 5-4* Relays
.
N O T I C E
After enabling the drive bypass function, the drive is no longer safety certified (for using the Safe Torque Off in versions, where
included).
To deactivate the drive bypass at normal operation (emergency mode not activated), carry out 1 of the 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 cycle.
N O T I C E
The drive bypass cannot be deactivated if in emergency mode. It can be deactivated only by either removing the emergency
mode command signal or the power supply to the drive.
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 emergency mode status messages. When the automatic drive bypass function is enabled, it cuts in the ex-
ternal bypass according to the sequence shown in
e3
0b
a5
46
.1
0
Oper a tion
A lar m
R ela y
"B ypass"
On dela y (P5-41)
Speed
ON
OFF
A ut o R esets
A ut o R eset Disabled
B ypass
D ela y
T imer
P24-11
A lar m
Illustration 96: Drive Bypass
The status can be read in the extended status word 2, bit number 24.
AU275636650261en-000101 / 130R0334
570 | Danfoss A/S © 2022.12
Parameter Descriptions
VLT AutomationDrive FC 301/302
Programming Guide
Summary of Contents for VLT AutomationDrive FC 301
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