VLT
®
6000 HVAC
152
MG.60.B1.02 - VLT is a registered Danfoss trade mark
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 VLT 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 VLT
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 VLT frequency converter
cannot
be reset until the counter is below 90%.
The fault is that the VLT 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 allows a choice of whether the VLT
frequency 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 allows a choice of whether the VLT
frequency converter is to give a warning or an alarm.
Check that the thermistor has been correctly
connected between terminal 53 or 54 (analogue
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 frequency converter 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
frequency converter will trip and give off an alarm.
Turn off the VLT frequency converter and check
whether the motor shaft can be turned and whether
the motor size matches the VLT 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
and the motor or in the motor itself.
Turn off the VLT 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 VLT frequency
converter and remove the short-circuit.
WARNING/ALARM 17
Serial communication timeout
(STD BUSTIMEOUT)
There is no serial communication with the VLT
frequency converter.
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 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 Bus time interval.
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