WARNING 6, DC link voltage low
The intermediate circuit voltage (DC) is lower than the low
voltage warning limit. The limit is dependent on the
frequency converter voltage rating. The frequency converter
is still active.
WARNING/ALARM 7, DC overvoltage
If the intermediate circuit voltage exceeds the limit, the
frequency converter trips after a time.
Troubleshooting
Connect a brake resistor
Extend the ramp time
Change the ramp type
Activate functions in
2-10 Brake Function
Increase
14-26 Trip Delay at Inverter Fault
WARNING/ALARM 8, DC under voltage
If the intermediate circuit voltage (DC) drops below the
under voltage limit, the frequency converter checks if a 24V
DC backup supply is connected. If no 24V DC backup supply
is connected, the frequency converter trips after a fixed time
delay. The time delay varies with unit size.
Troubleshooting
Check that the supply voltage matches the
frequency converter voltage.
Perform Input voltage test
Perform soft charge and rectifier circuit test
WARNING/ALARM 9, Inverter overload
The frequency converter is about to cut out because of an
overload (too high current for too long). The counter for
electronic, thermal inverter protection gives a warning at
98% and trips at 100%, while giving an alarm. The frequency
converter
cannot
be reset until the counter is below 90%.
The fault is that the frequency converter is overloaded by
more than 100% for too long.
Troubleshooting
Compare the output current shown on the LCP
with the frequency converter rated current.
Compare the output current shown on the LCP
with measured motor current.
Display the Thermal Drive Load on the LCP and
monitor the value. When running above the
frequency converter continuous current rating, the
counter should increase. When running below the
frequency converter continuous current rating, the
counter should decrease.
See the derating section in the
Design Guide
for more details
if a high switching frequency is required.
WARNING/ALARM 10, Motor overload temperature
According to the electronic thermal protection (ETR), the
motor is too hot. Select whether the frequency converter
gives a warning or an alarm when the counter reaches 100%
in
1-90 Motor Thermal Protection
. The fault occurs when the
motor is overloaded by more than 100% for too long.
Troubleshooting
Check for motor overheating.
Check if the motor is mechanically overloaded
Check that the motor current set in
1-24 Motor
Current
is correct.
Ensure that Motor data in parameters 1-20 through
1-25 are set correctly.
If an external fan is in use, check in
1-91 Motor
External Fan
that it is selected.
Running AMA in
1-29 Automatic Motor Adaptation
(AMA)
may tune the frequency converter to the
motor more accurately and reduce thermal
loading.
WARNING/ALARM 11, Motor thermistor over temp
The thermistor might be disconnected. Select whether the
frequency converter gives a warning or an alarm in
1-90 Motor Thermal Protection
.
Troubleshooting
Check for motor overheating.
Check if the motor is mechanically overloaded.
When using terminal 53 or 54, check that the
thermistor is connected correctly between either
terminal 53 or 54 (analog voltage input) and
terminal 50 (+10V supply) and that the terminal
switch for 53 or 54 is set for voltage. Check
1-93 Thermistor Source
selects terminal 53 or 54.
When using digital inputs 18 or 19, check that the
thermistor is connected correctly between either
terminal 18 or 19 (digital input PNP only) and
terminal 50. Check
1-93 Thermistor Source
selects
terminal 18 or 19.
WARNING/ALARM 12, Torque limit
The torque has exceeded the value in
4-16 Torque Limit Motor
Mode
or the value in
4-17 Torque Limit Generator Mode
.
14-25 Trip Delay at Torque Limit
can change this from a
warning only condition to a warning followed by an alarm.
Troubleshooting
If the motor torque limit is exceeded during ramp
up, extend the ramp up time.
If the generator torque limit is exceeded during
ramp down, extend the ramp down time.
If torque limit occurs while running, possibly
increase the torque limit. Be sure the system can
operate safely at a higher torque.
Check the application for excessive current draw
on the motor.
WARNING/ALARM 13, Over current
The inverter peak current limit (approx. 200% of the rated
current) is exceeded. The warning lasts about 1.5 sec., then
the frequency converter trips and issues an alarm. This fault
may be caused by shock loading or fast acceleration with
Warnings and Alarms
VLT
®
AutomationDrive Operating
Instructions
MG.33.AJ.02 - VLT
®
is a registered Danfoss trademark
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