•
•
•
Emergency mode alarm handling selected in parameter 24-09
Emergency Mode Alarm Handling. Critical alarms cause a trip.
Warranty-
affecting
alarms in
emergency
mode
Emergency m service warn-
ing
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 Illustration 96.
OFF
A ut o R esets A ut o R eset Disabled
B
Illustration 96: Drive Bypass
The status can be read in the extended status word 2, bit number 24.
AU275636650261en-000101 / 130R0334570 | Danfoss A/S © 2022.12
Parameter Descriptions
VLT AutomationDrive FC 301/302
Programming Guide
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