Fault Messages - Danfoss VLT AQUA High Power Operation Instructions Manual

7 Troubleshooting

7.1.1 Fault messages

WARNING 1, 10 volts low
The control card voltage is below 10 V from terminal 50.
Remove some of the load from terminal 50, as the 10 V supply is over-
loaded. Max. 15 mA or minimum 590 Ω.
This condition can be caused by a short in a connected potentiometer or
improper wiring of the potentiometer.
Troubleshooting: Remove the wiring from terminal 50. If the warning
clears, the problem is with the customer wiring. If the warning does not
clear, replace the control card.
WARNING/ALARM 2, Live zero error
This warning or alarm will only appear if programmed by the user in pa-
rameter 6-01, Live Zero Timeout Function. The signal on one of the
analog inputs is less than 50% of the minimum value programmed for
that input. This condition can be caused by broken wiring or faulty device
sending the signal.
Troubleshooting:
Check connections on all the analog input terminals. Control
7
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 drive programming and switch settings match
the analog signal type.
Perform Input Terminal Signal Test.
WARNING/ALARM 3, No motor
No motor has been connected to the output of the frequency converter.
This warning or alarm will only appear if programmed by the user in pa-
rameter 1-80, Function at Stop.
Troubleshooting: Check the connection between the drive and the mo-
tor.
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 parameter
14-12, Function at Mains 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 drive voltage rating. The
frequency converter is still active.
WARNING 6, DC link voltage low
The intermediate circuit voltage (DC) is lower than the low voltage warn-
ing limit. The limit is dependent on the drive voltage rating. The frequency
converter is still active.
WARNING/ALARM 7, DC overvoltage
If the intermediate circuit voltage exceeds the limit, the frequency con-
verter trips after a time.
Troubleshooting:
Connect a brake resistor
Extend the ramp time
Change the ramp type
186
VLT AQUA High Power Operation Instructions
Activate functions in par. 2-10
Increase par. 14-26
WARNING/ALARM 8, DC under voltage
If the intermediate circuit voltage (DC) drops below the under voltage
limit, the frequency converter checks if a 24 V backup supply is connec-
ted. If no 24 V 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 and rectifier circuit test
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. The frequency converter
90%.
The fault is that the frequency converter is overloaded by more than
100% for too long.
Troubleshooting:
Compare the output current shown on the LCP keypad with the
drive rated current.
Compare the output current shown on the LCP keypad with
measured motor current.
Display the Thermal Drive Load on the keypad and monitor the
value. When running above the drive continuous current rating,
the counter should increase. When running below the drive con-
tinuous current rating, the counter should decrease.
Note: 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 frequency converter gives a warning or an alarm when
the counter reaches 100% in par. 1-90
fault is that the motor is overloaded by more than 100% for too long.
Troubleshooting:
Check if motor is over heating.
If the motor is mechanically overloaded
That the motor par. 1-24
Motor data in parameters 1-20 through 1-25 are set correctly.
The setting in parameter 1-91, Motor External Fan.
Run AMA in parameter 1-29.
WARNING/ALARM 11, Motor thermistor over temp
The thermistor or the thermistor connection is disconnected. Select
whether the frequency converter gives a warning or an alarm when the
counter reaches 100% in par. 1-90
Troubleshooting:
Check if motor is over heating.
Check if the motor is mechanically overloaded.
®
MG.20.P3.02 - VLT is a registered Danfoss trademark
Brake Function
Trip Delay at Inverter Fault
cannot
be reset until the counter is below
Motor Thermal Protection
Motor Current
is set correctly.
Motor Thermal Protection .
. The