Specifications

Troubleshooting
Check connections on all the analog input
terminals:
•
Control card terminals 53 and 54 for
signals, terminal 55 common.
•
MCB 101 terminals 11 and 12 for signals,
terminal 10 common.
•
MCB 109 terminals 1, 3, 5 for signals,
terminals 2, 4, 6 common).
Check that the frequency converter programming
and switch settings match the analog signal type.
Perform 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 on the frequency converter.
Options are programmed at SP-12 Function at Line
Imbalance.
Troubleshooting
Check the supply voltage and supply currents to the
frequency converter.
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
frequency converter voltage rating. The unit 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
frequency converter voltage rating. The unit 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 the functions in B-10 Brake Function
Increase SP-26 Trip Delay at Drive Fault
WARNING/ALARM 8, DC under voltage
If the intermediate circuit voltage (DC link) drops below
the under voltage limit, the frequency converter checks for
a 24 V DC backup supply. If no 24 V 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 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 on the LCP with the
frequency converter rated current.
Compare the output current 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 increases. When running below the
frequency converter continuous current rating,
the counter decreases.
See 8.5 Special Conditions 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 F-10 Electronic Overload. 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 P-03 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 F-11 Motor
External Fan that it is selected.
Run AMA in P-04 Auto Tune 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
F-10 Electronic Overload.
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 (analogue voltage input) and
terminal 50 (+10 V supply) and that the terminal
General Specifications and ... VLT® HVAC Drive FC 102 Design Guide
206 MG16C102 - Rev. 2013-08-20
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