Danfoss vlt fcd 302 Operating Instructions Manual page 70

Troubleshooting
The alarm words, warning words and extended status words
can be read out via serial bus or optional fieldbus for
diagnose. See also 16-94 Ext. Status Word.
W W ARNING 1, 10 Volts low:
The 10V voltage from terminal 50 on the control card is
below 10V.
Remove some of the load from terminal 50, as the 10V
supply is overloaded. Max. 15mA or minimum 590 .
WARNING/ALARM 2, Live zero error:
The signal on terminal 53 or 54 is less than 50% of the value
set in 6-10 Terminal 53 Low Voltage, 6-12 Terminal 53 Low
Current, 6-20 Terminal 54 Low Voltage, or 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 case 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 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
"voltage warning low" limit (see table above), the frequency
converter checks if 24V backup supply is connected.
If no 24V 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 section 8.2 General Specifications.
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 gives a warning at
98% and trips at 100%, while giving an alarm. You cannot
reset the frequency converter until the counter is below 90%.
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VLT Decentral Drive FCD 302 Operating Instructions
The fault is that the frequency converter is overloaded by
more than 100% for too long.
WARNING/ALARM 10, Motor ETR over temperature:
According to the electronic thermal protection (ETR), the
motor is too hot. You can choose if you want the frequency
converter to give a warning or an alarm when the counter
reaches 100% in 1-90 Motor Thermal Protection. The fault is
that the motor is overloaded by more than 100% for too
long. Check that the motor 1-24 Motor Current is set correctly.
WARNING/ALARM 11, Motor thermistor over temp:
The thermistor or the thermistor connection is disconnected.
You can choose if you want the frequency converter to give
a warning or an alarm when the counter reaches 100% in
1-90 Motor Thermal Protection. Check that the thermistor is
connected correctly between terminal 53 or 54 (analog
voltage input) and terminal 50 (+ 10V supply), or between
terminal 18 or 19 (digital input PNP only) and terminal 50. If
aKTY sensoris used, check for correct connection between
terminal 54 and 55.
WARNING/ALARM 12, Torque limit:
The torque is higher than the value in 4-16 Torque Limit
Motor Mode (in motor operation) or the torque is higher than
the value in 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 will last approx. 8-12 sec.,
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:
A fitted option is not handled by the present control board
(hardware or software).
ALARM 16, Short-circuit
There is short-circuiting in the motor or on the motor
terminals.
Turn off the frequency converter and remove the short-
circuit.
WARNING/ALARM 17, Control word timeout:
There is no communication to the frequency converter.
The warning will only be active when 8-04 Control Word
Timeout Function is NOT set to OFF.
If 8-04 Control Word Timeout Function is set to Stop and Trip, a
warning appears and the frequency converter ramps down
until it trips, while giving an alarm.
8-03 Control Word Timeout Time could possibly be increased.
MG.04.F2.02 - VLT is a registered Danfoss trademark
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