Danfoss FC 300 Design Manual page 191

FC 300 Design Guide
Check the supply voltage and supply currents
to the adjustable frequency drive.
WARNING 5, DC link voltage high:
The intermediate circuit voltage (DC) is higher
than the overvoltage limit of the control sys-
tem. The adjustable frequency drive is still
active.
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.
Possible corrections:
Alarm/warning limits:
FC 300 Series 3 x
Undervoltage
Voltage
warning low
Voltage
warning high
(w/o brake -
w/brake)
Overvoltage
The voltages stated are the intermediate circuit
voltage of the FC 300 with a tolerance of ± 5%.
The corresponding line voltage is the inter-
mediate 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
Specifications
WARNING/ALARM 9, Inverter overloa-
ded:
Connect a brake resistor
Extend the ramp time
Activate functions in par. 2-10
Increase par. 14-26
3 x 3 x
200-240 380-500 525-600 V
V V
[VDC] [VDC] [VDC]
185 373 532
205 410 585
390/405 810/840 943/965
410 855 975
.
MG.33.B9.22 - VLT ® is a registered Danfoss trademark.
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
98% and trips at 100%, while giving an alarm.
You cannot reset the adjustable frequency
drive until the 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. You can choose if
you want the adjustable frequency drive 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.
WARNING/ALARM 11, Motor thermistor
overtemp:
The thermistor or the thermistor connection is
disconnected. You can choose if you want the
adjustable frequency drive to give a warning
or an alarm when the counter reaches 100%
in par. 1-90. Make sure that the thermistor is
connected correctly between terminal 53 or
54 (analog voltage input) and terminal 50 (+
10 V supply), or between terminal 18 or 19
(digital input PNP only) and terminal 50. If
aKTY sensoris used, check for correct connec-
tion 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, 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.
If extended mechanical brake control is selec-
General
ted, trip can be reset externally.
ALARM 14, Ground fault:
10. Troubleshooting
10
191