•
•
•
•
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-
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The motor speed is below the value set in parameter 4-52 Warning Speed Low.
In auto-on mode, the drive starts the motor with a start signal from a digital input or serial communication.
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.
[12] Enable Start Forward and [13] Enable Start Reverse were selected as functions for 2 dierent digital inputs
(parameter group 5–1* Digital Inputs). The motor starts in forward or reverse depending on which corresponding
terminal is activated.
The drive has received a stop command from 1 of the following:
LCP.
Digital input.
Serial communication.
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 proles, 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.
AQ357954340588en-000201 / 130R0881 | 121Danfoss A/S © 2020.09
Maintenance, Diagnostics, and
Troubleshooting
VLT® Refrigeration Drive FC 103
Operating Guide
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