VLT
®
4000 VT
WARNING/ALARM 8
Undervoltage (DC LINK UNDERVOLT)
If the intermediate circuit voltage (DC) drops below
the
undervoltage limit
of the inverter, the VLT
AFD will trip after a fixed period, the length of
the period depending on the unit.
Furthermore, the voltage will be stated in the
display. Check whether the supply voltage matches
the VLT AFD, see
Technical data
.
WARNING/ALARM 9
Inverter overload (INVERTER TIME)
The electronic, thermal inverter protection reports that
the AFD is about to cut out because of an over-load (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. The VLT AFD
cannot be reset until the counter is below 90%.
The fault is that the VLT AFD is overloaded by
more than 100% for too long.
WARNING/ALARM 10
Motor overtemperature (MOTOR TIME)
According to the electronic thermal protection (ETR),
the motor is too hot. Parameter 117
Motor thermal
protection
allows a choice of whether the VLT AFD is
to give a warning or an alarm when the
Motor thermal
projection
reaches 100%. The fault is that the motor
is overloaded by more than 100% of the preset, rated
motor current for too long. Check that the motor
parameters 102-106 have been set correctly.
WARNING/ALARM 11
Motor thermistor (MOTOR THERMISTOR)
The thermistor or the thermistor connection has been
disconnected. Parameter 117
Motor thermal protection
allows a choice of whether the VLT AFD is to give a
warning or an alarm. Check that the thermistor has
been correctly connected between terminal 53 or 54
(analog voltage input) and terminal 50 (+ 10 V supply).
WARNING/ALARM 12
Current limit (CURRENT LIMIT)
The current is higher than the value in parameter
215
Current limit I
LIM
and the VLT AFD trips
after the time set in parameter 412
Trip delay
overcurrent, I
LIM
has passed.
WARNING/ALARM 13
Overcurrent (OVER CURRENT)
The inverter peak current limit (approx. 200% of
the rated current) has been exceeded. The warning
will last approx. 1-2 seconds, following which the
VLT AFD will trip and give off an alarm.
Turn off the VLT AFD and check whether the
motor shaft can be turned and whether the motor
size matches the VLT AFD.
ALARM: 14
Ground fault (GROUND FAULT)
There is a discharge from the output phases to
ground, either in the cable between the AFD and
the motor or in the motor itself.
Turn off the VLT AFD and remove the ground fault.
ALARM: 15
Switch mode fault (SWITCH MODE FAULT)
Fault in the switch mode power supply
(internal ± 15 V supply).
Contact your Danfoss supplier.
ALARM: 16
Short-circuiting (CURR. SHORT CIRCUIT)
There is short-circuiting on the motor terminals
or in the motor itself.
Cut off the line supply to the VLT AFD and
remove the short-circuit.
WARNING/ALARM 17
Serial communication timeout (STD
BUSTIMEOUT)
There is no serial communication with the VLT
AFD. This warning will only be enabled if parameter
556
Bus time interval function
has been set to
a value different from OFF.
If parameter 556
Bus time interval function
has
been set to Stop and trip [5], the VLT AFD will first
give off an alarm, then ramp down and finally trip
while giving off an alarm. It is possible to increase
parameter 555
Bus time interval.
WARNING/ALARM 18
HPFB bus timeout (HPFB TIMEOUT)
There is no serial communication with the
commu-nication option card of the VLT AFD.
The warning will only be enabled if parameter 804
Bus
time interval function
has been set to anything but OFF.
If parameter 804
Bus time interval function
has been set
MG.40.A7.22 - VLT is a registered Danfoss trademark
118