9.1.1 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 an-
alog 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
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).
Make sure 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 adjustable frequency
drive. This warning or alarm will only appear if programmed by the user
in parameter 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 line voltage imbalance is too
high. This message also appears for a fault in the input rectifier on the
adjustable frequency drive. Options are programmed at parameter
14-12, Function at Mains Imbalance
Troubleshooting:
Check the supply voltage and supply currents to the
adjustable frequency drive.
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
adjustable frequency drive 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 adjust-
able frequency drive is still active.
WARNING/ALARM 7, DC overvoltage
If the intermediate circuit voltage exceeds the limit, the adjustable fre-
quency drive trips after a time.
Troubleshooting:
Connect a brake resistor
Extend the ramp time
Change the ramp type
Activate functions in par. 2-10
Brake Function
Increase par. 14-26
Trip Delay at Inverter Fault
WARNING/ALARM 8, DC undervoltage
If the intermediate circuit voltage (DC) drops below the undervoltage
limit, the adjustable frequency drive checks if a 24 V backup supply is
connected. If no 24 V backup supply is connected, the adjustable fre-
quency drive trips after a fixed time delay. The time delay varies with unit
size.
Troubleshooting:
Make sure that the supply voltage matches the adjustable fre-
quency drive voltage.
Perform Input voltage test
Perform soft charge and rectifier circuit test
WARNING/ALARM 9, Inverter overloaded
The adjustable frequency drive is about to cut out because of an overload
(too high current for too long). The counter for electronic, thermal inver-
ter protection gives a warning at 98% and trips at 100%, while giving an
alarm. The adjustable frequency drive
cannot
be reset until the counter
is below 90%.
The fault is that the adjustable frequency drive 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 adjustable frequency drive gives a warning or an
alarm when the counter reaches 100% in par. 1-90
Motor Thermal Pro-
tection
. The fault is that the motor is overloaded by more than 100% for
too long.
Troubleshooting:
Check if the motor is overheating.
If the motor is mechanically overloaded
That the motor par. 1-24
Motor Current
is set correctly.
9 Troubleshooting
VLT AQUA Low Harmonic Drive Instruction
Manual
9-4
MG.20.T1.22 - VLT
®
is a registered Danfoss trademark
9
