Danfoss VLT Aqua Drive FC 202 Operating Instructions Manual page 120

8. Troubleshooting
Possible corrections:
Alarm/warning limits:
Voltage
ranges
Undervoltage
Voltage
warning low
Voltage
warning high
(w/o brake -
w/brake)
Overvoltage
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
8
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
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. Re-
set cannot be performed before 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. It can be chosen
if the frequency converter is to give a warning
or an alarm when the counter reaches 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.
120
Connect a brake resistor
Extend the ramp time
Activate functions in par. 2-10
Increase par. 14-26
3 x 200 - 3 x 380 - 3 x 525 -
240 V 480 V 600 V
[VDC] [VDC] [VDC]
185 373 532
205 410 585
390/405 810/840 943/965
410 855 975
Specifications
MG.20.M2.02 - VLT
WARNING/ALARM 11, Motor thermistor
over temp:
The thermistor or the thermistor connection is
disconnected. Choose if the frequency con-
verter is to give a warning or an alarm when
the counter reaches 100% in par. 1-90. Check
that the thermistor is connected correctly be-
tween terminal 53 or 54 (analog voltage input)
and terminal 50 (+ 10 Volts supply), or be-
tween terminal 18 or 19 (digital input PNP
only) and terminal 50. If a KTY sensor is used,
check for correct connection between 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.
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, In-complete 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.
WARNING/ALARM 17, Control word
timeout:
There is no communication to the frequency
converter.
The warning will only be active when par. 8-04
OFF
is NOT set to .
If par. 8-04 is set to
appears and the frequency converter ramps
down until it trips, while giving an alarm.
Control word Timeout Time
par. 8-03
possibly be increased.
®
is a registered Danfoss trademark
®
VLT AQUA Drive
Operating Instructions
Stop Trip
and , a warning
could