Danfoss VLT Decentral Drive FCD 302 Operating Manual page 69

Troubleshooting
The alarm words, warning words and extended status
words can be read out via serial bus or optional fieldbus
for diagnosis. See also parameter 16-94 Ext. Status Word.
WARNING 1, 10 Volts low
The 10 V voltage from terminal 50 on the control card is
below 10 V.
Remove some of the load from terminal 50, as the 10 V
supply is overloaded. Max. 15 mA or minimum 590 Ω.
WARNING/ALARM 2, Live zero error
The signal on terminal 53 or 54 is less than 50% of the
value set in parameter 6-10 Terminal 53 Low Voltage,
parameter 6-12 Terminal 53 Low Current,
parameter 6-20 Terminal 54 Low Voltage, or
parameter 6-22 Terminal 54 Low Current respectively.
WARNING/ALARM 3, No motor
No motor has been connected to the output of the
frequency converter.
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 in the event of a fault in the
input rectifier on the frequency converter.
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
overvoltage limit of the control system. The frequency
converter is still active.
WARNING 6, DC link voltage low
The intermediate circuit voltage (DC) is below the
undervoltage limit of the control system. The frequency
converter is still active.
WARNING/ALARM 7, DC over voltage
If the intermediate circuit voltage exceeds the limit, the
frequency converter trips after a time.
Possible corrections:
Connect a brake resistor
Extend the ramp time
Activate functions in parameter 2-10 Brake
Function
Increase parameter 14-26 Trip Delay at Inverter
Fault
WARNING/ALARM 8, DC under voltage
If the intermediate circuit voltage (DC) drops below the
"voltage warning low" limit (see Table 7.3), the frequency
converter checks if 24 V backup supply is connected.
If no 24 V backup supply is connected, the frequency
converter trips after a given time depending on the unit.
To check whether the supply voltage matches the
frequency converter, see chapter 8.2 General Specifications.
MG04F402
Operating Guide
WARNING/ALARM 9, Inverter overloaded
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 warns 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 overloads more
than 100% for too long.
WARNING/ALARM 10, Motor ETR electronic overload over
temperature
According to the electronic thermal protection (ETR), the
motor is too hot. Select whether the frequency converter
will trigger a warning or an alarm when the counter
reaches 100% in parameter 1-90 Motor Thermal Protection.
The fault is that the motor overloads more than 100% for
too long. Check that the motor parameter 1-24 Motor
Current is set correctly.
WARNING/ALARM 11, Motor thermistor over temp
The motor has exceeded the temperature limit. Wait until
the motor is cooled down. The thermistor or the
thermistor connection disconnects when the temperature
limit is exceeded. Set the frequency convertor to give
either a warning or an alarm when the counter reaches
100% in parameter 1-90 Motor Thermal Protection. Check
that the thermistor is connected correctly between
terminal 53 or 54 (analog voltage input) and terminal 50
(+ 10 V supply), or between terminal 18 or 19 (digital input
PNP only) and terminal 50. If a KTY sensor is used, check
for correct connection between terminal 54 and 55.
WARNING/ALARM 12, Torque limit
The torque is higher than the value in
parameter 4-16 Torque Limit Motor Mode (in motor
operation) or the torque is higher than the value in
parameter 4-17 Torque Limit Generator Mode (in
regenerative operation).
WARNING/ALARM 13, Over Current
The inverter peak current limit (approx. 200% of the rated
current) is exceeded. The warning lasts approx. 8-12 s, then
the frequency converter trips and issues an alarm. Turn off
the frequency converter and check if the motor shaft can
be turned and if the motor size matches the frequency
converter.
If extended mechanical brake control is selected, trip can
be reset externally.
ALARM 14, Earth fault
There is a discharge from the output phases to earth,
either in the cable between the frequency converter and
the motor or in the motor itself.
Turn off the frequency converter and remove the earth
fault.
ALARM 15, Incomplete hardware
The control board (hardware or software) does not support
a fitted option.
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