Warning/Alarm List; 10 Volts Low; Live Zero Error; No Motor - Danfoss vlt FC 102 Operating Instructions Manual

7. Troubleshooting

7.1.2. Warning/Alarm list

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 ohm.
WARNING/ALARM 2, Live zero error:
The signal on terminal 53 or 54 is less than 50% of the value set in par.
6-10, 6-12, 6-20, or 6-22 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
7
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 con-
verter trips after a time.
Connect a brake resistor. Extend the ramp time
Possible corrections:
Connect a brake resistor
Extend the ramp time
Activate functions in par. 2-10
Increase par. 14-26
Alarm/warning limits:
Voltage
ranges
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,
Specifications
see .
138
3 x 200 - 240 3 x 380 - 480 3 x 525 - 600 V
V V
[VDC] [VDC] [VDC]
185 373 532
205 410 585
390/405 810/840 943/965
410 855 975
MG.11.A6.02 - VLT
®
VLT HVAC Drive Operating Instructions
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. Reset cannot be performed before counter is below 90%.
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.
It can be chosen if the frequency converter is to give a warning or an
alarm when the counter reaches 100% in par. 1-90. The fault is that the
motor is overloaded by more than 100% for too long. Check that the
motor par. 1-24 is set correctly.
WARNING/ALARM 11, Motor thermistor over temp:
The thermistor or the thermistor connection is disconnected. Choose if
the frequency converter is to give a warning or an alarm when the counter
reaches 100% in par. 1-90. Check that the thermistor is connected cor-
rectly 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 (in motor operation) or
the torque is higher than the value in par. 4-17 (in regenerative opera-
tion).
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 is NOT set to
Stop Trip
If par. 8-04 is set to and
converter ramps down until it trips, while giving an alarm.
par. 8-03 Control word Timeout Time
WARNING 25, Brake resistor short-circuited:
The brake resistor is monitored during operation. If it short-circuits, the
brake function is disconnected and the warning appears. The frequency
converter still works, but without the brake function. Turn off the fre-
quency converter and replace the brake resistor (see par. 2-15
Check
.
® is a registered Danfoss trademark
OFF
.
, a warning appears and the frequency
could possibly be increased.
Brake