Troubleshooting - Danfoss VLT HVAC Basic Drive Programming Manual

Troubleshooting

4 Troubleshooting
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.
4 4
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.
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 using the [RESET] button on the LCP,
the [AUTO ON] or [HAND ON] button must be pressed to
restart the motor.
No. Description
2 Live zero error
3 No motor
4 Mains phase loss
7 DC over voltage
8 DC under voltage
9 Inverter overloaded
10 Motor ETR over temperature
11 Motor thermistor over temperature
13 Over Current
14 Earth fault
16 Short Circuit
17 Control word timeout
24 Fan Fault (Only on 400V 30-90kW)
30 Motor phase U missing
31 Motor phase V missing
32 Motor phase W missing
38 Internal fault
44 Earth fault 2
47 Control Voltage Fault
48 VDD1 Supply Low
50 AMA Calibration Failed
51 AMA check U
52 AMA low I
74
VLT HVAC Basic Drive Programming Guide
and I
nom nom
nom
MG.18.B1.02 - VLT
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 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 (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 frequency converter. Once
the problem has been rectified, only the alarm continues
flashing.
Warning Alarm
(X) (X)
(X)
(X) (X)
X X
X X
X X
(X) (X)
(X) (X)
X X
X X
X
(X) (X)
X X
(X)
(X)
(X)
X
X
X
X
X
X
X
®
is a registered Danfoss trademark
Trip Lock Parameter Reference
6-01
1-80
(X) 14-12
1-90
1-90
X
X
X
8-04
14-53
(X) 4-58
(X) 4-58
(X) 4-58
X
X
X
X