Troubleshooting; Alarms And Warnings - Danfoss FC 100 Series Operating Instructions Manual

Troubleshooting

8 Troubleshooting

8.1 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 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 using the [RESET] control button on the LCP.
2. Via a digital input with the "Reset" function.
3. Via serial communication/optional fieldbus.
4. By resetting automatically using the [Auto Reset]
function, which is a default setting for VLT HVAC
Drive Drive, see par. 14-20 Reset Mode in the FC 100
Programming Guide
NOTE
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.
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).
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VLT HVAC Drive Operating Instructions
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 par. 14-20 Reset Mode
(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 par. 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.
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MG.11.AD.02 - VLT is a registered Danfoss trademark
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