Danfoss VLT FC 300 Instruction Manual page 131

VLT ® Automation Drive FC 300
Instruction Manual High Power
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 ex-
ceeds the limit, the adjustable frequen-
cy drive trips after a given period of
time.
Possible corrections:
Alarm/warning limits:
Adjustable fre-
quency drive:
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
Specifications
Connect a brake resistor
Extend the ramp time
Activate functions in par. 2-10
Increase par. 14-26
3 x 380- 3 x 525-
500 V 690 V
[VDC] [VDC]
402 553
423 585
817/828 1084/1109
855 1130
.
MG.33.U1.22 - VLT ® is a registered Danfoss trademark.
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
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,
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-
General
justable frequency drive.
If extended mechanical brake control is selec-
ted, trip can be reset externally.
6. Warnings and Alarms
Motor ETR over-
131
6