Danfoss VLT AQUA Drive FC 200 Instruction Manual page 144

6. Troubleshooting
WARNING 6, DC link voltage low
The intermediate circuit voltage (DC) is below
the undervoltage limit of the control system.
The adjustable frequency drive is still active.
WARNING/ALARM 7, DC overvoltage:
If the intermediate circuit voltage exceeds the
limit, the adjustable frequency drive trips after
a given period of time.
Connect a brake resistor. Extend the ramp
time
Possible corrections:
6
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 adjustable frequency drive with
a tolerance of ± 5%. The corresponding AC line
voltage is the intermediate circuit voltage (DC
link) divided by 1.35.
WARNING/ALARM 8, DC undervoltage:
If the intermediate circuit voltage (DC) drops
below the "voltage warning low" limit (see ta-
ble above), the adjustable frequency drive
checks if 24 V backup supply is connected.
If no 24 V backup supply is connected, the
adjustable frequency drive trips after a given
period of time, depending on the unit.
To check whether the supply voltage matches
the adjustable frequency drive, see
tions
WARNING/ALARM 9, Inverter overloa-
ded:
The adjustable frequency drive is about to cut
out because of an overload (too high current
for too long). The counter for electronic, ther-
mal inverter protection gives a warning at
144
Connect a brake resistor
Extend the ramp time
Activate functions in par. 2-10
Increase par. 14-26
3 x 3 x
200-240 380-480
V V
[VDC] [VDC]
185 373
205 410
390/405 810/840
410 855
.
MG.20.P1.22 - VLT
VLT AQUA High Power Instruction Manual
98% and trips at 100%, while giving an alarm.
Reset cannot be performed before counter is
below 90%.
The fault is that the adjustable frequency
drive 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 adjustable frequency drive is 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
overtemp:
3 x
The thermistor or the thermistor connection is
525-600 V
disconnected. Decide whether the adjustable
frequency drive is to give a warning or an
[VDC]
alarm when the counter reaches 100% in par.
532
1-90. Make sure the thermistor is connected
585
correctly between terminal 53 or 54 (analog
voltage input) and terminal 50 (+10 V supply),
943/965
or between terminal 18 or 19 (digital input
PNP only) and terminal 50. If a KTY sensor is
used, check for correct connection between
975
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, Overcurrent:
The inverter peak current limit (approximately
200% of the rated current) is exceeded. The
warning will last approximately 8-12 sec., then
the adjustable frequency drive trips and issues
an alarm. Turn off the adjustable frequency
drive and check if the motor shaft can be
turned and if the motor size matches the ad-
justable frequency drive.
Specifica-
ALARM 14, Ground fault:
There is a discharge from the output phases
to ground, either in the cable between the ad-
justable frequency drive and the motor or in
the motor itself.
Turn off the adjustable frequency drive and
remove the ground fault.
®
is a registered Danfoss trademark.