Danfoss VLT FC 280 Operating Manual page 108

VLT® Midi Drive FC 280
Operating Guide
8 Maintenance, Diagnostics, and Troubleshooting
8.1 Maintenance and Service
Under normal operating conditions and load profiles, 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.
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 fieldbus 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.
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Press [Off] 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 is in operational readiness.
8.2 Warning and Alarm Types
Warnings
A warning is issued when an alarm condition is impending, or when an abnormal operating condition is present and may result in
the drive issuing an alarm. A warning clears by itself when the abnormal condition ceases.
Alarms
An alarm indicates a fault that requires immediate attention. The fault always triggers a trip or a trip lock. Reset the system after an
alarm.
Trip
An alarm is issued when the drive is tripped, meaning that the drive suspends operation to prevent damage to the drive or system.
The motor coasts to a stop. The drive logic continues to operate and monitor the drive status. After the fault condition is remedied,
the drive can be reset. It is then ready to start operation again.
Trip lock
Input power is cycled. The motor coasts to a stop. The drive continues to monitor the drive status. Remove input power to the drive,
correct the cause of the fault, and reset the drive.
Resetting the drive after a trip/trip lock
A trip can be reset in any of 4 ways:
• Press [Reset] on the LCP.
• Digital reset input command.
• Serial communication reset input command.
• Auto reset.
8.3 Warning and Alarm Displays
Setup 1
Status
Illustration 49: Warning Display
An alarm or trip lock alarm shows in the display along with the alarm number.
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