Danfoss VLT 2800 Series, Руководство по эксплуатации

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overvoltage in the UDC can occur when the motor fre-
quency is reduced too quickly due to ramp down time
being too short. When the inverter is switched off a trip
reset is generated. Note:
Voltage warning high (warn-
ing 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
un-
dervoltage 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 converter, see
Technical
data . When the frequency converter is switched off a
alarm 8 (and alarm 6) is displayed briefly and a trip
reset is generated. Note:
Voltage warning low (warning
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 over-
loading (output current too high for too long). The
counter for electronic thermal inverter protection gives
a warning at 98% and trips at 100% accompanied by
an alarm. The frequency converter cannot be reset
until the counter drops below 90%. This fault arises
because the frequency converter has been overloa-
ded for too long.
WARNING/ALARM 10: Motor overloaded
According to the electronic thermal inverter protection
the motor is too hot. In parameter 128 the user can
select whether the 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.
WARNING/ALARM 11: Motor thermistor
The motor is too hot or the thermistor/thermistor con-
nection 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 correctly 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 param-
eter 221
Current Limit
LIM
, and the frequency converter
will trip after a set time, selected in parameter 409
Trip
delay overcurrent .
WARNING/ALARM 13: Overcurrent
The inverter's peak current limit (approx. 200% of rated
output current) has been exceeded. The warning 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 motor 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 converter
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 frequency
converter and remove the short-circuit.
WARNING/ALARM 17: Serial communication time-
out
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 parameter
804 Bus timeout function is set to Stop and trip , it will
first give a warning and then ramp down and trip out
accompanied by an alarm. Parameter 803 Bus time-
out can if required be increased.
WARNING 33: Out of frequency range
This warning is active if the output frequency has
reached Output frequency low limit (parameter 201) or
Output frequency high limit (parameter 202). If the fre-
quency converter is in
Process regulation, closed loop
(parameter 100) the warning will be active in the dis-
play. If the frequency converter is in another mode than
Process regulation, closed loop , bit 008000 Out of fre-
quency range in extended status word will be active,
but there will not be a warning in the display.
VLT
®
2800 Series
MG.27.A2.02 - VLT
®
is a registered Danfoss trademark 79
All a
bou
t
VLT 2
800