Danfoss VLT 2800 Series Operating Instructions Manual page 68

when the connected mains voltage is too low. Check
whether the supply voltage is suitable for the fre-
quency converter, see Technical data. When the
frequency converter is switched off a brief warning 6
(and warning 8) appears.
WARNING/ALARM 7: Overvoltage
If the intermediate voltage (UDC) goes over the in-
verter's Overvoltage limit the inverter will be
switched off until the UDC has once more fallen be-
low the overvoltage limit. If the UDC remains above
the overvoltag limit the inverter will trip after a set
time. The time depends on the device, and is set at
5 - 10 sec. An overvoltage in the UDC can occur
when the motor frequency is reduced too quickly
due to ramp down time being too short. Note: Volt-
age warning high (warning 5) will thus also be able
to generate an alarm 7.
WARNING/ALARM 8: Undervoltage
If the intermediate circuit voltage (UDC) is lower
than the inverter's Undervoltage limit the inverter will
be switched off until the UDC once more goes above
the undervoltage limit. If the UDC remains under the
undervoltage limit, the inverter will trip after a set
time. The time depends on the device, and is set at
2 - 15 sec. An undervoltage can occur when the
connected mains voltage is too low. Check whether
the supply voltage is suitable for the frequency con-
verter, see Technical data. When the frequency
converter is switched off a warning 8 (and warning 6)
is displayed briefly. Note: Voltage warning low (warn-
ing 6) will thus also be able to generate an alarm 8.
WARNING/ALARM 9: Inverter overload
Electronic thermal inverter protection indicates that
the frequency converter is close to tripping due to
overloading (output current too high for too long).
The counter for electronic thermal inverter protection
gives a warning at 98% and trips at 100% accompa-
nied by an alarm. The frequency converter cannot
be reset until the counter drops below 90%. This
fault arises because the frequency converter has
been overloaded for too long.
WARNING/ALARM 10: Motor overloaded
According to the electronic thermal inverter protec-
tion the motor is too hot. In parameter 128 the user
can select whether the VLT frequency converter
should emit a warning or an alarm when the counter
reaches 100%. This fault is due to the motor being
overloaded by more than 100% for too long. Check
that motor parameters 102–106 are set correctly.
68
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VLT 2800 Series
WARNING/ALARM 11: Motor thermistor
The motor is too hot or the thermistor/thermistor
connection has been disconnected. In parameter
128 Thermal motor protection the user can select
whether the frequency transformer emits a warning
or an alarm. Check that the PTC thermistor is cor-
rectly connected between terminals 18, 19, 27 or 29
(digital input) and terminal 50 (+ 10 V supply).
WARNING/ALARM 12: Current limit
The output current is greater than the value in pa-
rameter 221 Current Limit
converter will trip after a set time, selected in param-
eter 409 Trip delay overcurrent.
WARNING/ALARM 13: Overcurrent
The inverter's peak current limit (approx. 200% of
rated output current) has been exceeded. The warn-
ing will last approx. 1-2 sec, and the frequency
converter will then trip and emit an alarm. Switch off
the frequency converter and check whether the mo-
tor shaft can be turned, and whether the size of the
motor is suitable for the frequency converter.
ALARM 14: Earth fault
There is a discharge from the output phases to
earth, either in the cable between the frequency con-
verter and the motor, or in the motor. Turn off the
frequency converter and remove the earth fault.
ALARM 15: Switch mode fault
Fault in switch mode power supply (internal supply).
Contact your Danfoss supplier.
ALARM: 16: Short-circuit
There is a short-circuit on the motor terminals or in
the motor. Disconnect the mains supply to the fre-
quency converter and remove the short-circuit.
WARNING/ALARM 17: Serial communication
timeout
There is no serial communication to the frequency
converter. The warning will only be active when 514
Bus timeout function is set to a value other than OFF.
If parameter 514 Bus timeout function is set to Stop
and trip [5], it will first give a warning and then ramp
down and trip out accompanied by an alarm. Param-
eter 513 Bus timeout can if required be increased
WARNING/ALARM 18: HPFB bus timeout
There is no serial communication to the frequency
converter's communication option card. This warning
will only be active when parameter 804 Bus timeout
function is set to a value other than OFF. If parame-
ter 804 Bus timeout function is set to Stop and trip, it
will first give a warning and then ramp down and trip
MG.28.A5.02 - VLT is a registered Danfoss trade mark
, and the frequency
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