Danfoss VLT HVAC Drive FC 100 Series, Programming Manual, Page: 93 / 122

4 Troubleshooting
4.1.1 Alarms and Warnings
A warning or an alarm is signaled by the relevant LED on
the front of the adjustable frequency drive 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 adjustable frequency drive
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.
4. By resetting automatically using the [Auto Reset]
function, which is a default setting for VLT HVAC
Basic Drive, see
14-20 Reset Mode .
NOTE!
After a manual reset pressing [Reset], the [Auto On] or
[Hand On] 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).
CAUTION
Alarms that are trip-locked offer additional protection,
means that the line power supply must be switched off
before the alarm can be reset. After being switched back
on, the adjustable frequency drive 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 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
1-90 Motor Thermal
Protection . After an alarm or trip, the motor carries on
coasting, and the alarm and warning flash on the
adjustable frequency drive. Once the problem has been
rectified, only the alarm continues flashing.
No. Description Warning Alarm Trip Lock Parameter Reference
2 Live zero error (X) (X) 6-01
3 No motor (X) 1-80
4 Mains ph. loss (X) (X) (X) 14-12
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
11 Motor thermistor over-temperature (X) (X) 1-90
13 Over Current X X X
14 Earth fault X X X
16 Short.-circuit X X
17 Control word timeout (X) (X) 8-04
24 Fan Fault (only on 400V 40–125 hp [30–90kW]) X X 14-53
30 Motor phase U missing (X) (X) 4-58
31 Motor phase V missing (X) (X) 4-58
32 Motor phase W missing (X) (X) 4-58
38 Internal fault X X
44 Earth fault 2 X X
47 Control Voltage Fault X X
48 VDD1 Supply Low X X
Troubleshooting
VLT
®
HVAC Basic Drive Programming Guide
MG18B222 - VLT
®
is a registered Danfoss trademark 4-1
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