VLT
®
FCD Series
LED indication
Warning yellow
Alarm red
Trip locked yellow and red
WARNING/ALARM 2: Live zero fault
The voltage or current signal on terminal 53 or 60 is
below 50% of the preset value in parameter 309 or
315 Terminal, min. scaling.
WARNING/ALARM 4: Mains phase fault
No phase on mains supply side. Check the supply
voltage to the frequency converter. This fault is only
active in 3-phase mains supply. The alarm can only
occur when the load is pulsing. In this instance the
pulses must be dampened, e.g. using an inertia disc.
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 re-
duced 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 fre-
quency 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 in-
verter’s Overvoltage limit the inverter will be
switched off until the UDC has once more fallen be-
low 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: Volt-
age 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 con-
verter, see Technical data. When the frequency
converter is switched off a warning 8 (and warning 6)
is displayed briefly. Note: Voltage warning low (warn-
ing 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% accompa-
nied 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 protec-
tion 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 cor-
rectly connected between terminals 31a and 31b.
WARNING/ALARM 12: Current limit
The output current is greater than the value in pa-
rameter 221 Current Limit
LIM
, and the frequency
converter will trip after a set time, selected in param-
eter 409 Trip delay overcurrent.
MG.04.A1.02 - VLT is a registered Danfoss trade mark
126
To Next Page
Loading...
Need help?
General