WARNING 6, DC link voltage low
The intermediate circuit voltage (DC) is below
the under-voltage limit of the control system.
The frequency converter is still active.
WARNING/ALARM 7, DC over voltage:
If the intermediate circuit voltage ex-
ceeds the limit, the frequency converter
trips after a time.
Possible corrections:
Connect a brake resistor
Extend the ramp time
Activate functions in par. 2-10
Increase par. 14-26
Alarm/warning limits:
Frequency con-
verter:
3 x 380 -
500 V
3 x 525 -
690 V
[VDC]
[VDC]
Under-voltage
402
553
Voltage warning
low
423
585
Voltage warning
high (w/o brake -
w/brake)
817/828
1084/1109
Over-voltage
855
1130
The voltages stated are the intermediate circuit
voltage of the frequency converter with a tol-
erance of ± 5 %. The corresponding mains
voltage is the intermediate circuit voltage (DC-
link) divided by 1.35
WARNING/ALARM 8, DC under-voltage:
If the intermediate circuit voltage (DC) drops
below the “voltage warning low” limit (see ta-
ble above), the frequency converter checks if
24 V backup supply is connected.
If no 24 V backup supply is connected, the
frequency converter trips after a given time
depending on the unit.
To check whether the supply voltage matches
the frequency converter, see
General Specifi-
cations
.
WARNING/ALARM 9, Inverter overloa-
ded:
The frequency converter is about to cut out
because of an overload (too high current for
too long). The counter for electronic, thermal
inverter protection gives a warning at 98%
and trips at 100%, while giving an alarm. You
cannot reset the frequency converter until the
counter is below 90%.
The fault is that the frequency converter is
overloaded by more than 100% for too long.
WARNING/ALARM 10,
Motor ETR over
temperature:
According to the electronic thermal protection
(ETR), the motor is too hot. You can choose if
you want the frequency converter to give a
warning or an alarm when the counter rea-
ches 100% in par. 1-90. The fault is that the
motor is overloaded by more than 100% for
too long. Check that the motor par. 1-24 is set
correctly.
WARNING/ALARM 11, Motor thermistor
over temp:
The thermistor or the thermistor connection is
disconnected. You can choose if you want the
frequency converter to give a warning or an
alarm when the counter reaches 100% in par.
1-90. Check that the thermistor is connected
correctly between terminal 53 or 54 (analog
voltage input) and terminal 50 (+ 10 V sup-
ply), or between terminal 18 or 19 (digital
input PNP only) and terminal 50. If aKTY sen-
soris used, check for correct connection be-
tween terminal 54 and 55.
WARNING/ALARM 12, Torque limit:
The torque is higher than the value in par.
4-16 (in motor operation) or the torque is
higher than the value in par. 4-17 (in regen-
erative operation).
WARNING/ALARM 13, Over Current:
The inverter peak current limit (approx. 200%
of the rated current) is exceeded. The warning
will last approx. 8-12 sec., then the frequency
converter trips and issues an alarm. Turn off
the frequency converter and check if the mo-
tor shaft can be turned and if the motor size
matches the frequency converter.
If extended mechanical brake control is selec-
ted, trip can be reset externally.
ALARM 14, Earth fault:
There is a discharge from the output phases
to earth, either in the cable between the fre-
quency converter and the motor or in the
motor itself.
Turn off the frequency converter and remove
the earth fault.
ALARM 15, Incomplete hardware:
A fitted option is not handled by the present
control board (hardware or software).
ALARM 16, Short-circuit:
There is short-circuiting in the motor or on the
motor terminals.
Turn off the frequency converter and remove
the short-circuit.
VLT
®
Automation Drive FC 300
Operating Instructions High Power
6. Warnings and Alarms
MG.33.U1.02 - VLT
®
is a registered Danfoss trademark
127
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