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WARNING/ALARM 4: Mains phase fault
No phase on electrical supply side. Check the supply
voltage to the variable frequency drive. This fault is only
active in 3-phase electrical 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 variable frequency drive 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 variable frequency drive will trip with an alarm
7 (overvoltage). A voltage warning can occur when
the connected AC supply voltage is too high. Check
whether the supply voltage is suitable for the variable
frequency drive, 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 variable frequency drive 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 variable frequency drive will trip
with an alarm 5 (undervoltage). A voltage warning
can occur when the connected AC line voltage is too
low. Check whether the supply voltage is suitable
for the variable frequency drive, see Technical data.
When the variable frequency drive 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
190
Decentral Solutions
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
AC line voltage is too low. Check whether the supply
voltage is suitable for the variable frequency drive, see
Technical data. When the variable frequency drive 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 variable frequency drive 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 variable frequency
drive cannot be reset until the counter drops below
90%. This fault arises because the variable frequency
drive 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 variable frequency drive 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
frequency drive 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
MG.90.F2.22 - VLT is a registered Danfoss trademark
, and the variable
LIM
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