9 Troubleshooting
9.1 Alarms and Warnings - Frequency
Converter (Right LCP)
9.1.1 Warnings/Alarm Messages
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 three ways:
1. By pressing [Reset].
2. Via a digital input with the “Reset” function.
3. Via serial communication/optional fieldbus.
NOTE
After a manual reset pressing [Reset], press [Auto 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 9.1).
Alarms that are trip-locked offer additional protection,
meaning 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
NOTE
Automatic wake-up is possible!
If a warning and alarm is marked against a code in the
table on the following page, this means that either a
warning occurs before an alarm, or else that you can
specify 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. Once the
problem has been rectified, only the alarm continues
flashing until the frequency converter is reset.
No. Description Warning Alarm/Trip Alarm/Trip Lock Parameter
Reference
1 10 Volts low X
2 Live zero error (X) (X) 6-01 Live Zero Timeout
Function
3 No motor (X) 1-80 Function at Stop
4 Mains phase loss (X) (X) (X) 14-12 Function at
Mains Imbalance
5 DC link voltage high X
6 DC link voltage low X
7 DC over-voltage X X
8 DC under voltage X X
9 Inverter overloaded X X
10 Motor ETR over temperature (X) (X) 1-90 Motor Thermal
Protection
11 Motor thermistor over temperature (X) (X) 1-90 Motor Thermal
Protection
12 Torque limit X X
13 Over Current X X X
14 Earth Fault X X X
15 Hardware mismatch X X
16 Short Circuit X X
Troubleshooting VLT Automation Low Harmonic Drive Operating Instructions
MG34O202 - VLT
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