VLT® 7000 Booster
Warnings and alarms, cont.
WARNING/ALARM 8
Undervoltage (DC LINK UNDERVOLT)
If the intermediate circuit voltage (DC) drops below
the undervoltage limit of the inverter, the frequency
converter 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
frequency converter, see Technical data.
WARNING/ALARM 9
Inverter overload (INVERTER TIME)
The electronic, thermal inverter protection reports that
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. The frequency converter c
annot
be reset until the counter is below 90%.
The fault is that the frequency converter 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 allowsachoiceofwhetherthefrequency
converter 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 allowsachoiceofwhetherthefrequen
cy
converteristogiveawarningoranalarm. Check
that the thermistor has been correctly connected
between terminal 53 or 54 (analogue vol
tage input)
and terminal 50 (+ 10 V supply).
WARNING/ALARM 12
Current limit (CURRENT LIMIT)
The current is higher than the value in parameter
215 Cu rrent limit I
LIM
and the frequency converter
trips after the time set in parameter 412 Trip d elay
overcurrent ,I
LIM
has passed.
WARNING/ALARM 13
Overcurrent (OVER CURRENT)
The inverter peak current limit (approx. 200% of the
rated current) has been exceed
ed. The warning
will last approx. 1-2 seconds, following which the
frequency converter will trip and give off an alarm.
Turn off the frequency converter and check whether
the motor shaft can be turned and whether the motor
size matches the frequency converter.
ALARM: 14
Earth fault (EARTH FAULT)
There is a discharge from the output phases to earth,
either in the cable between the frequency converter
andthemotororinthemotoritself. Turnoffthe
frequency converter and remove the earth 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 mains supply to the
frequency converter and remove the short-circuit.
WARNING/ALARM 17
Serial communication timeout (STD
BUSTIMEOUT)
There is no serial communication with the
frequency converter.
This warning will only be enabled if parameter
556 Bu s time interval function has been set to
a value different from OFF.
If parameter 556 Bus t ime interval function has been
set to Stop and trip [5], the frequency converter
will first give off an alarm, then ramp down and
finally trip while giving off an alarm. It is possible to
increase parameter 555 Bustimeinterval.
Warnings and alarms, cont.
WARNING/ALARM 18
HPFB bus timeout (HPFB TIMEOUT)
There is no serial communication with the
communication option card of the frequenc
y converter.
The warning will only be enabled if parameter 804 Bus
time interval function has been set to anything but
OFF. If parameter 804 Bus t ime interval f
unction has
been set to Stop and trip, the frequency converter
will first give off an alarm, then ramp down and
finally trip while giving off an alarm
.
Parameter 803 Bustimeintervalcould possibly
be increased.
MG.70.A1.02 - VLT is a registered Danfoss trademark
114
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General