Troubleshooting - Danfoss FC 51 Series Programming Manual

Troubleshooting

6 Troubleshooting
A warning or an alarm is signalled by the relevant LED on
the front of the frequency converter and indicated by a
code on the display.
A warning remains active until its cause is no longer
present. Under certain circumstances operation of the
motor may still be continued. Warning messages may be
critical, but are not necessarily so.
In the event of an alarm, the frequency converter will have
tripped. Alarms must be reset to restart operation once
their cause has been rectified.
This may be done in four ways:
1. By pressing [Reset].
2. Via a digital input with the "Reset" function.
3. Via serial communication.
NOTE
After a manual reset press [Reset], [Auto On] or [Hand On]
to restart the motor.
If an alarm cannot be reset, the reason may be that its
cause has not been rectified, or the alarm is trip-locked
(see also Table 6.1).
No. Description
2 Live zero error
4 Mains phase loss
7 DC over voltage
8 DC under voltage
9 Inverter overloaded
10 Motor ETR over temperature
11 Motor thermistor over temperature
12 Torque limit
13 Over Current
14 Earth fault
16 Short Circuit
17 Control word timeout
25 Brake resistor short-circuited
27 Brake chopper short-circuited
28 Brake Check
29 Power board over temp
30 Motor phase U missing
31 Motor phase V missing
32 Motor phase W missing
38 Internal fault
44 Earth fault 2
47 Control Voltage Fault
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VLT Micro Drive FC 51 Programming Guide
Alarms that are trip-locked offer additional protection,
means that the mains supply must be switched off before
the alarm can be reset. After being switched back on, the
frequency converter is no longer blocked and may be reset
as described above once the cause has been rectified.
Alarms that are not trip-locked can also be reset using the
automatic reset function in 14-20 Reset Mode (Warning:
automatic wake-up is possible!)
If a warning and alarm is marked against a code in the
Table 6.1, this means that either a warning occurs before
an alarm, or it can be specified whether it is a warning or
an alarm that is to be displayed for a given fault.
This is possible, for instance, in 1-90 Motor Thermal
Protection. After an alarm or trip, the motor carries on
coasting, and the alarm and warning flash on the
frequency converter. Once the problem has been rectified,
only the alarm continues flashing.
Warning Alarm
(X) (X)
(X) (X)
X X
X X
X X
(X) (X)
(X) (X)
(X)
X X
X X
X
(X) (X)
X
X
X
X
(X)
(X)
(X)
X
X
X
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CAUTION
Trip Lock Error
(X)
X
X
X
X
X
X
(X)
(X)
(X)
X
X
X
6 6
Parameter
Reference
6-01
14-12
1-90
1-90
4-16, 4-17
8-04
4-58
4-58
4-58
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