Danfoss VLT AutomationDrive FC 303 Instruction Manual page 64

Warnings and Alarms
WARNING/ALARM 3, No motor
No motor has been connected to the output of the
Adjustable frequency drive.
WARNING/ALARM 4, Mains phase loss
A phase is missing on the supply side, or the line voltage
imbalance is too high. This message also appears for a
fault in the input rectifier on the Adjustable frequency
drive. Options are programmed at 14-12 Function at Mains
Imbalance.
Troubleshooting
Check the supply voltage and supply currents to the
Adjustable frequency drive.
WARNING 5, DC link voltage high
The intermediate circuit voltage (DC) is higher than the
high voltage warning limit. The limit is dependent on the
Adjustable frequency drive voltage rating. The Adjustable
frequency drive is still active.
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
Adjustable frequency drive voltage rating. The Adjustable
frequency drive is still active.
WARNING/ALARM 7, DC overvoltage
If the intermediate circuit voltage exceeds the limit, the
Adjustable frequency drive 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
undervoltage limit, the Adjustable frequency drive checks if
a 24V DC backup supply is connected. If no 24V DC
backup supply is connected, the Adjustable frequency
drive trips after a fixed time delay. The time delay varies
with unit size.
Troubleshooting
Check that the supply voltage matches the
Adjustable frequency drive voltage.
Perform Input voltage test
Perform soft charge and rectifier circuit test
WARNING/ALARM 9, Inverter overload
The Adjustable frequency drive 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
VLT ® AutomationDrive Instruction
Manual
Adjustable frequency drive cannot be reset until the
counter is below 90%.
The fault is that the Adjustable frequency drive is
overloaded by more than 100% for too long.
Troubleshooting
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 Adjustable frequency
drive 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
WARNING/ALARM 11, Motor thermistor over temp
The thermistor might be disconnected. Select whether the
Adjustable frequency drive gives a warning or an alarm in
1-90 Motor Thermal Protection.
Troubleshooting
®
MG.33.AI.22 - VLT is a registered Danfoss trademark
Compare the output current shown on the LCP
with the Adjustable frequency drive 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
Adjustable frequency drive continuous current
rating, the counter should increase. When
running below the Adjustable frequency drive
continuous current rating, the counter should
decrease.
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 Adjustable frequency drive
to the motor more accurately and reduce thermal
loading.
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
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