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VLT
®
HVAC Drive Programming Guide
4.1.5 Fault messages
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 over-
loaded. 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 par.
Terminal 53 Low Voltage
6-10
, par.6-12
Terminal 54 Low Voltage
6-20
, or par.6-22
spectively.
WARNING/ALARM 3, No motor:
No motor has been connected to the output of the adjustable frequency
drive.
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 in case of a fault in the input rectifier on the
adjustable frequency drive.
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 overvoltage limit
of the control system. The adjustable frequency drive is still active.
WARNING 6, DC-link voltage low:
The intermediate circuit voltage (DC) is below the undervoltage limit of
the control system. The adjustable 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.
Possible corrections:
Select Over Voltage Control function in par.2-17
Control
Connect a brake resistor
Extend the ramp time
Activate functions in par.2-10
Trip Delay at Inverter Fault
Increase par.14-26
Selecting OVC function will extend the ramp times.
Alarm/warning limits:
3 x 200–240 V
Voltage Range
AC
[VDC]
Undervoltage
185
Voltage warn-
205
ing low
Voltage warn-
ing high (w/o
390/405
brake - w/
brake)
Overvoltage
410
The voltages stated are the intermediate circuit voltage of the ad-
justable frequency drive with a tolerance of ± 5%. The correspond-
ing AC line voltage is the intermediate circuit voltage (DC link)
divided by 1.35.
Terminal 53 Low Current
, par.
Terminal 54 Low Current
re-
Over-voltage
Brake Function
3 x 380–500 V
3 x 550–600 V
AC
AC
[VDC]
[VDC]
373
532
410
585
810/840
943/965
855
975
MG.11.C6.22 - VLT
®
is a registered Danfoss trademark
WARNING/ALARM 8, DC undervoltage:
If the intermediate circuit voltage (DC) drops below the "voltage warning
low" limit (see table above), the adjustable frequency drive checks if 24
V backup supply is connected.
If no 24 V backup supply is connected, the adjustable frequency drive
trips after a given time depending on the unit.
To check whether the supply voltage matches the adjustable frequency
drive, see the section
General Specifications
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. You cannot reset the adjustable frequency drive until the counter
is below 90%.
The fault is that the adjustable frequency drive is overloaded by more
than nominal current for too long.
WARNING/ALARM 10, Motor ETR overtemperature:
According to the electronic thermal protection (ETR), the motor is too hot.
You can choose if you want the adjustable frequency drive to give a
warning or an alarm when the counter reaches 100% in par.1-90
Thermal Protection
. The fault is that the motor is overloaded by more
than nominal current for too long. Make sure that the motor par.
Motor Current
1-24
is set correctly.
WARNING/ALARM 11, Motor thermistor overtemp:
The thermistor or the thermistor connection is disconnected. You can
choose if you want the adjustable frequency drive to give a warning or
Motor Thermal Protection
an alarm in par.1-90
is connected correctly between terminal 53 or 54 (analog voltage input)
and terminal 50 (+ 10 Volts 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 par.4-16
Mode
(in motor operation) or the torque is higher than the value in par.
Torque Limit Generator Mode
4-17
(in regenerative operation).
WARNING/ALARM 13, Overcurrent:
The inverter peak current limit (approx. 200% of the rated current) is
exceeded. The warning will last approx. 8-12 sec., then the adjustable
frequency drive trips and issues an alarm. Turn off the adjustable fre-
quency drive and check if the motor shaft can be turned and if the motor
size matches the adjustable frequency drive.
ALARM 14, Ground fault:
There is a discharge from the output phases to ground, either in the cable
between the adjustable frequency drive and the motor or in the motor
itself.
Turn off the adjustable frequency drive and remove the ground fault.
ALARM 15, Incomplete hardware:
A fitted option is not handled by the present control board (hardware or
software).
4 Troubleshooting
.
4
Motor
. Check that the thermistor
Torque Limit Motor
4-7
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