VLT
®
FCD Series
All about FCD
300
WARNING 5: Voltage warning high
If the intermediate circuit voltage (UDC) is higher than
Voltage warning high
the frequency converter will
give a warning and the motor will continue to run
unchanged. If the UDC remains above the voltage
warning limit, the inverter will trip after a set time. The
time depends on the device, and is set at 5 - 10
sec. Note: The frequency converter will trip with an
alarm 7 (overvoltage). A voltage warning can occur
when the connected mains voltage is too high. Check
whether the supply voltage is suitable for the frequency
converter, see
Technical data
. A voltage warning
can also occur if the motor frequency is reduced too
quickly due to ramp down time being too short.
WARNING 6: Voltage warning low
If the intermediate circuit voltage (UDC) is lower than
Voltage warning low
the frequency converter will
give a warning and the motor will continue to run
unchanged. If the UDC remains below the voltage
warning limit, the inverter will trip after a set time. The
time depends on the device, and is set at 2 - 25 sec.
Note: The frequency converter will trip with an alarm 5
(undervoltage). A voltage warning 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 frequency converter is
switched off a brief warning 6 (and warning 8) appears.
WARNING/ALARM 7: Overvoltage
If the intermediate voltage (UDC) goes over the
inverter
’
s
Overvoltage limit
the inverter will be switched
off until the UDC has once more fallen below
the overvoltage limit. If the UDC remains above
the overvoltag limit the inverter will trip after a set
time. The time depends on the device, 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
Undervoltage limit
the inverter will be
switched off until the UDC once more goes above
the undervoltage limit. If the UDC remains under the
undervoltage 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 frequency 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.
WARNING/ALARM 9: Inverter overload
Electronic thermal inverter protection indicates that
the frequency converter 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 frequency
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 correctly.
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 frequency
converter will then trip and emit an alarm. Switch
off the frequency 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 Danfoss supplier.
MG.04.B7.02 - VLT is a registered Danfoss trademark
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