Warning/Alarm 2, Live Zero Error; Warning/Alarm 8, Dc Under Voltage; Warning/Alarm 9, Inverter Overload; Warning/Alarm 11, Motor Thermistor Overtemp - Danfoss VLT Midi Drive FC 280 Programming Manual

Troubleshooting

WARNING/ALARM 2, Live zero error

This warning or alarm only appears if programmed in
parameter 6-01 Live Zero Timeout Function. The signal on 1
of the analog inputs is less than 50% of the minimum
value programmed for that input. Broken wiring or faulty
device sending the signal can cause this condition.
Troubleshooting
•
Check connections on all the analog input
terminals. Control card terminals 53 and 54 for
signals, terminal 55 common.
•
Check that the frequency converter programming
and switch settings match the analog signal type.
•
Perform the input terminal signal test.
WARNING/ALARM 4, Mains phase loss
A phase is missing on the supply side, or the mains
voltage imbalance is too high. This message also appears
for a fault in the input rectifier. Options are programmed in
parameter 14-12 Function at Mains Imbalance.
Troubleshooting
•
Check the supply voltage and supply currents to
the frequency converter.
WARNING/ALARM 7, DC overvoltage
If the DC-link voltage exceeds the limit, the frequency
converter trips after a time.
Troubleshooting
•
Extend the ramp time.
•
Change the ramp type.

WARNING/ALARM 8, DC under voltage

If the DC-link voltage (DC-link) drops below the
undervoltage limit, 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 the input voltage test.
•
Perform the soft charge 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 issues a warning at
90% and trips at 100%, while giving an alarm. The
frequency converter cannot be reset until the counter is
below 0%.
The fault is that the frequency converter has run with
more than 100% overload 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.
MG07C302
Programming Guide
•
WARNING/ALARM 10, Motor overload temperature
According to the electronic thermal protection (ETR), the
motor is too hot. Select whether the frequency converter
issues a warning or an alarm when the counter reaches
100% in parameter 1-90 Motor Thermal Protection. The fault
occurs when the motor runs with more than 100%
overload for too long.
Troubleshooting
•
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WARNING/ALARM 11, Motor thermistor overtemp

Check whether the thermistor is disconnected. Select
whether the frequency converter issues a warning or an
alarm in parameter 1-90 Motor Thermal Protection.
Troubleshooting
•
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WARNING/ALARM 12, Torque limit
The torque has exceeded the value in
parameter 4-16 Torque Limit Motor Mode or the value in
parameter 4-17 Torque Limit Generator Mode.
Parameter 14-25 Trip Delay at Torque Limit can change this
warning from a warning-only condition to a warning
followed by an alarm.
Danfoss A/S © 07/2016 All rights reserved.
Show the thermal frequency converter load on
the LCP and monitor the value. When running
above the frequency converter continuous
current rating, the counter increases. When
running below the frequency converter
continuous current rating, the counter decreases.
Check for motor overheating.
Check if the motor is mechanically overloaded.
Check that the motor current set in
parameter 1-24 Motor Current is correct.
Ensure that motor data in parameters 1-20 to 1-25
are set correctly.
Running AMA in parameter 1-29 Automatic Motor
Adaptation (AMA) tunes the frequency converter
to the motor more accurately and reduces
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
terminal 50 (+10 V supply). Also check that the
terminal switch for 53 or 54 is set for voltage.
Check that parameter 1-93 Thermistor Source
selects terminal 53 or 54.
When using terminal 18, 19, 32, or 33 (digital
inputs), check that the thermistor is connected
correctly between the digital input terminal used
(digital input PNP only) and terminal 50. Select
the terminal to use in parameter 1-93 Thermistor
Source.
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