7 Maintenance, Diagnostics, and Troubleshooting
7.1 Maintenance and Service
Under normal operating conditions and load profiles, the
frequency converter is maintenance-free throughout its
designed lifetime. To prevent breakdown, danger, and
damage, examine the frequency converter for terminal
connections tightness, dust entry, and so on at regular
intervals depending on the operating conditions. Replace
worn or damaged parts with original spare parts or
standard parts. For service and support, contact the local
Danfoss supplier.
WARNING
UNINTENDED START
When the frequency converter is connected to AC mains,
DC supply, or load sharing, the motor may start at any
time. Unintended start during programming, service, or
repair work can result in death, serious injury, or
property damage. The motor can start via an external
switch, a fieldbus command, an input reference signal
from the LCP, or after a cleared fault condition.
To prevent unintended motor start:
•
Disconnect the frequency converter from the
mains.
•
Press [Off/Reset] on the LCP before
programming parameters.
•
Completely wire and assemble the frequency
converter, motor, and any driven equipment
before connecting the frequency converter to
AC mains, DC supply, or load sharing.
7.2 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 frequency converter 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 frequency converter is
tripped, meaning that the frequency converter suspends
operation to prevent frequency converter or system
damage. The motor coasts to a stop. The frequency
converter logic continues to operate and monitor the
frequency converter status. After the fault condition is
remedied, the frequency converter can be reset. It is then
ready to start operation again.
Resetting the frequency converter after 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.
Trip lock
Input power is cycled. The motor coasts to a stop. The
frequency converter continues to monitor the frequency
converter status. Remove input power to the frequency
converter, correct the cause of the fault, and reset the
frequency converter.
Warning and alarm displays
•
A warning is shown in the LCP along with the
warning number.
•
An alarm flashes along with the alarm number.
130BP086.12
Status
0.0Hz 0.000kW 0.00A
0.0Hz
0
Earth Fault [A14]
Auto Remote Trip
1(1)
Illustration 7.1 Alarm Example
Maintenance, Diagnostics, a...
VLT
®
AutomationDrive FC 301/302
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MG33AT02
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