Fault Messages - Danfoss VLT HVAC Drive FC 100 Series Design Manual

8. General Specifications and Troubleshooting

8.6.5. 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.
53 Low Voltage
6-10 Terminal
6-20 Terminal 54 Low Voltage
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.
8
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 con-
verter trips after a time.
Possible corrections:
Select Over Voltage Control function in par. 2-17 Over-volt-
Control
age
Connect a brake resistor
Extend the ramp time
Activate functions in par. 2-10 Brake
Increase par. 14-26 Trip
Selecting OVC function will extend the ramp times.
Alarm/warning limits:
Voltage Range
Undervoltage
Voltage warning low
Voltage warning high (w/o
brake - w/brake)
Overvoltage
The voltages stated are the intermediate circuit voltage of the fre-
quency converter with a tolerance of ± 5 %. The corresponding
mains voltage is the intermediate circuit voltage (DC-link) divided
by 1.35
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 24 V back-
up 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,
3.1 General Specifications
see
174
53 Low Current
, par. 6-12 Terminal
, or par. 6-22 Terminal 54 Low Current
Function
Delay at Inverter Fault
3 x 200-240 V AC 3 x 380-500 V AC
[VDC] [VDC]
185 373
205 410
390/405 810/840
410 855
.
MG.11.B7.02 - VLT
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 be-
low 90%.
The fault is that the frequency converter is overloaded by more than
, par.
nominal current 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 par. 1-90 Motor
Protection
. The fault is that the motor is overloaded by more than nominal
current for too long. Check that the motor par. 1-24 Motor
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
Thermal Protection
in par. 1-90 Motor
nected 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 Torque
Mode (in motor operation) or the torque is higher than the value in par.
4-17 Torque Limit Generator Mode
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.
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, In-complete 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 par. 8-04 Control
tion is NOT set to OFF .
If par. 8-04 Control Timeout Function
appears and the frequency converter ramps down to zero speed, while
giving an alarm.
Timeout Time
par. 8-03 Control
WARNING 23, Internal fans:
External fans have failed due to defect hardware or fans not mounted.
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VLT HVAC Drive Design Guide
Thermal
Current is set
. Check that the thermistor is con-
Limit Motor
(in regenerative operation).
Timeout Func-
is set to Stop and Trip , a warning
could possibly be increased.