Danfoss VLT FC 302 N450 User Manual

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Operation

status

Description

Speed low

The motor speed is below the value set in parameter 4-52 Warning Speed Low.

Standby

In auto-on mode, the drive starts the motor with a start signal from a digital input or serial communication.

Start delay

In parameter 1-71 Start Delay, a delay starting time was set. A start command is activated and the motor starts

after the start delay time expires.

Start

fwd/rev

[12] Enable Start Forward and [13] Enable Start Reverse were selected as functions for 2 dierent digital inputs

(parameter group 5–1* Digital Inputs). The motor starts in forward or reverse depending on which corresponding

terminal is activated.

Stop

The drive has received a stop command from 1 of the following:

LCP.

Digital input.

Serial communication.

Trip/Trip

lock

An alarm occurred and the motor is stopped. Once the cause of the alarm is cleared, reset the drive using 1 of the

following:

Pressing [Reset].

Remotely by control terminals.

Via serial communication.

9.2 Maintenance and Service

Under normal operating conditions and load proles, the drive is maintenance-free throughout its designed lifetime. To prevent

breakdown, danger, and damage, examine the drive for loose terminal connections, excessive dust buildup, and so on, at regular

intervals. Replace worn or damaged parts with Danfoss authorized parts. For service and support, contact the local Danfoss supplier.

W A R N I N G

UNINTENDED START

When the drive is connected to the AC mains, DC supply, or load sharing, the motor may start at any time, causing risk of death,

serious injury, and equipment or property damage. The motor may start by activation of an external switch, a eldbus command,

an input reference signal from the LCP or LOP, via remote operation using MCT 10 Set-up software, or after a cleared fault condi-

tion.

Press [O] on the LCP before programming parameters.

Disconnect the drive from the mains whenever personal safety considerations make it necessary to avoid unintended motor

start.

Check that the drive, motor, and any driven equipment are in operational readiness.

9.3 Warnings and Alarms

9.3.1 Warning and Alarm Types

Alarm

An alarm indicates a fault that requires immediate attention. The fault always triggers a trip or trip lock. Reset the drive after an

alarm using 1 of the following methods:

Press [Reset]/[O/R eset].

Digital reset input command.

Serial communication reset input command.

Auto reset.

Maintenance, Diagnostics, and

Troubleshooting

VLT® Refrigeration Drive FC 103

Operating Guide

Questions and Answers:

L
lisabrownJul 27, 2025
What to do if Danfoss VLT FC 302 N450 DC Drives trip lock?
- M
  Martin ColeJul 27, 2025
  If a Danfoss DC drive experiences a trip lock, it means an alarm occurred, and the motor has stopped. To resolve this, first, identify and clear the cause of the alarm. Then, reset the drive by: pressing the [Reset] button, using remote control terminals, or via serial communication.