8 Warnings and Alarms
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
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 par. ).
Alarms that are trip-locked offer additional protec-
tion, means that the mains supply must be switched
off before the alarm can be reset. After being switch-
ed 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 us-
ing 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 ei-
ther 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
. 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.
VLT HVAC Drive High Power Operating In-
structions
8 Warnings and Alarms
MG.11.F3.02 - VLT
®
is a registered Danfoss trademark
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