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WARNING/ALARM 4: Mains phase fault
No phase on mains supply side. Check the supply
voltage to the adjustable frequency drive. This fault is
only active in 3-phase mains supply. The alarm can
also 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 adjustable frequency drive will
give a warning and the motor will continue to run un-
changed. If the UDC remains above the voltage warn-
ing limit, the inverter will trip after a set time. The time
depends on the device, and is set at 5 - 10 sec. Note:
The adjustable frequency drive 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 adjustable fre-
quency 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 adjustable frequency drive will
give a warning and the motor will continue to run un-
changed. A voltage warning can occur when the con-
nected mains voltage is too low. Check whether the
supply voltage is suitable for the adjustable frequency
drive, see
Technical data
. When the adjustable fre-
quency drive is switched off a brief warning 6 (and
warning 8) appears.
WARNING/ALARM 7: Overvoltage
If the intermediate voltage (UDC) goes over the inver-
ter's
Overvoltage limit
the inverter will be switched off
until the UDC has once more fallen below the over-
voltage limit. If the UDC remains above the overvoltag
limit the inverter will trip after a set time. The time de-
pends on the device, and is set at 5 - 10 sec. An
overvoltage in the UDC can occur when the motor fre-
quency is reduced too quickly due to ramp down time
being too short. When the inverter is switched off a trip
reset is generated. Note:
Voltage warning high
(warn-
ing 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
un-
dervoltage 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 adjustable frequency drive, see
Technical data
. When the adjustable frequency drive is
switched off a alarm 8 (and alarm 6) is displayed briefly
and a trip reset is generated. 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
adjustable 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 adjustable frequency drive cannot be
reset until the counter drops below 90%. This fault ari-
ses because the adjustable 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 adjustable 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 pa-
rameters 102-106 are set correctly.
WARNING/ALARM 11: Motor thermistor
The motor is too hot or the thermistor/thermistor con-
nection 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 18, 19, 27 or 29 (digital input) and
terminal 50 (+ 10 V supply).
WARNING/ALARM 12: Current limit
The output current is greater than the value in param-
eter 221
Current Limit
LIM
, and the adjustable frequen-
cy drive will trip after a set time, selected in parameter
409
Trip delay overcurrent
.
VLT
®
2800 Series
MG.27.A2.22 - VLT
®
is a registered Danfoss trademark
99
All a
bou
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VLT 2
800