Troubleshooting - Danfoss VLT AQUA High Power Operating Instructions Manual

VLT AQUA High Power Operation Instructions

6. Troubleshooting

6.1. Alarms and warnings
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 oper-
ation 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.
2.
3.
4.
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 on following page).
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 parameter
14-20 (Warning: 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 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 parameter 1-90
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.
By using the [RESET] control button on the LCP control panel.
Via a digital input with the "Reset" function.
Via serial communication/optional fieldbus.
By resetting automatically using the [Auto Reset] function, which is a default setting for
VLT AQUA Drive. see par. 14-20 Reset Mode in
NB!
After a manual reset using the [RESET] button on the LCP, the [AUTO ON] or [HAND
ON] button must be pressed to restart the motor.
®
MG.20.P1.02 - VLT is a registered Danfoss trademark
VLT AQUA Drive Programming Guide
Motor Thermal Protection.
After an alarm or trip,
6. Troubleshooting
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