and is set at 5 - 10 sec. An overvoltage in the UDC can occur when the
motor frequency is reduced too quickly due to ramp down time being too
short. Note:
Voltage warning high
(warning 5) will thus also be able to
generate an alarm 7.
WARNING/ALARM 8: Undervoltage
If the intermediate circuit voltage (UDC) is lower than the inverter's
Un-
dervoltage limit
the inverter will be switched off until the UDC once more
goes above the undervoltage limit. If the UDC remains under the
under-
voltage limit
, the inverter will trip after a set time. The time depends on
the device, and is set at 2 - 15 sec. An undervoltage can occur when the
connected mains voltage is too low. Check whether the supply voltage is
suitable for the frequency converter, see
Technical data
. When the fre-
quency converter is switched off a warning 8 (and warning 6) is displayed
briefly. Note:
Voltage warning low
(warning 6) will thus also be able to
generate an alarm 8.
Alarm/warning limits:
Without brake
With brake
FCD 300
3 x 380 - 480 V
[VDC]
3 x 380 - 480 V
[VDC]
Undervoltage
410
410
Voltage warning low
440
440
Voltage warning high 765
800
Overvoltage
820
820
WARNING/ALARM 9: Inverter overload
Electronic thermal inverter protection indicates that the frequency con-
verter is close to tripping due to overloading (output current too high for
too long). The counter for electronic thermal inverter protection gives a
warning at 98% and trips at 100% accompanied by an alarm. The fre-
quency converter cannot be reset until the counter drops below 90%.
This fault arises because the frequency converter has been overloaded
for too long.
WARNING/ALARM 10: Motor overloaded
According to the electronic thermal inverter protection the motor is too
hot. In parameter 128 the user can select whether the VLT frequency
converter should emit a warning or an alarm when the counter reaches
100%. This fault is due to the motor being overloaded by more than
100% for too long. Check that motor parameters 102–106 are set cor-
rectly.
WARNING/ALARM 11: Motor thermistor
The motor is too hot or the thermistor/thermistor connection has been
disconnected. In parameter 128
Thermal motor protection
the user can
select whether the frequency transformer emits a warning or an alarm.
Check that the PTC thermistor is correctly connected between terminals
31a and 31b.
WARNING/ALARM 12: Current limit
The output current is greater than the value in parameter 221
Current
Limit
LIM
, and the frequency converter will trip after a set time, selected
in parameter 409
Trip delay overcurrent
.
WARNING/ALARM 13: Overcurrent
The inverter's peak current limit (approx. 200% of rated output current)
has been exceeded. The warning will last approx. 1-2 sec, and the fre-
quency converter will then trip and emit an alarm. Switch off the fre-
quency converter and check whether the motor shaft can be turned, and
whether the size of the motor is suitable for 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. Turn
off the frequency converter and remove the earth fault.
ALARM 15: Switch mode fault
Fault in switch mode power supply (internal supply). Contact your Dan-
foss supplier.
ALARM 16: Short-circuit
There is a short-circuit on the motor terminals or in the motor. Disconnect
the mains supply to the frequency converter and remove the short-circuit.
WARNING/ALARM 17: Serial communication timeout
There is no serial communication to the frequency converter. The warning
will only be active when 514
Bus timeout function
is set to a value other
than OFF. If parameter 514
Bus timeout function
is set to
Stop and trip
[5], it will first give a warning and then ramp down and trip out accom-
panied by an alarm. Parameter 513
Bus timeout
can if required be
increased
WARNING/ALARM 18: HPFB bus timeout
There is no serial communication to the frequency converter's communi-
cation option card. This warning will only be active when parameter 804
Bus timeout function
is set to a value other than OFF. If parameter 804
Bus timeout function
is set to
Stop and trip
, it will first give a warning and
then ramp down and trip out accompanied by an alarm. Parameter 803
Bus timeout
can if required be increased.
WARNING 33: Out of frequency range
This warning is active if the output frequency has reached
Output fre-
quency low limit
(parameter 201) or
Output frequency high limit
(param-
eter 202). If the VLT frequency converter is in
Process regulation, closed
loop
(parameter 100) the warning will be active in the display. If the VLT
frequency converter is in another mode than
Process regulation, closed
loop
, bit 008000
Out of frequency range
in extended status word will be
active, but there will not be a warning in the display.
WARNING/ALARM 34: HPFB communication fault
Communication fault only occurs in Profibus versions.
ALARM 35: Inrush fault
This alarm occurs when the frequency converter has been connected to
the mains supply too many times within 1 minute.
WARNING/ALARM 36: Overtemperature
If the internal temperature rises above 75 - 85 °C (depending on the
device) the frequency converter will emit a warning, and the motor will
continue to run unchanged. If the temperature continues to rise, the
switch frequency is reduced automatically. See
Temperature-dependent
switching frequency
.
If the internal temperature of the heatsink rises above 92 - 100 °C (de-
pending on the unit) the frequency converter will cut out. The tempera-
ture fault cannot be reset until the temperature of the internal heatsink
has dropped to below 70 °C. The tolerance is ± 5 °C. The temperature
can be caused by the following:
-
The ambient temperature too high.
-
Motor cable too long.
-
Too high mains voltage.
ALARM 37–45: Internal fault
Internal faults 0–8 will be indicated in LED's Alarm, Warning, Bus, Status
as a flashing code.
4 All about FCD 300
VLT® Decentral FCD
90
MG.04.B8.02 - VLT is a registered Danfoss trademark
4
Summary of Contents for VLT Decentral FCD 300
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