Danfoss VLT AQUA Drive Operating Instructions Manual page 132

9. Troubleshooting
To check whether the supply voltage matches the frequency converter,
Specifications
see .
WARNING/ALARM 9, Inverter overloaded:
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. Reset cannot be performed before counter is below 90%.
The fault is that the frequency converter is overloaded by more than
100% for too long.
WARNING/ALARM 10, Motor ETR over temperature:
According to the electronic thermal protection (ETR), the motor is too hot.
It can be chosen if the frequency converter is to give a warning or an
alarm when the counter reaches 100% in par. 1-90. The fault is that the
motor is overloaded by more than 100% for too long. Check that the
motor par. 1-24 is set correctly.
WARNING/ALARM 11, Motor thermistor over temp:
The thermistor or the thermistor connection is disconnected. Choose if
the frequency converter is to give a warning or an alarm when the counter
reaches 100% in par. 1-90. Check that the thermistor is connected cor-
rectly between terminal 53 or 54 (analog voltage input) and terminal 50
(+ 10 Volts supply), or between terminal 18 or 19 (digital input PNP only)
and terminal 50. If a KTY sensor is used, check for correct connection
between terminal 54 and 55.
WARNING/ALARM 12, Torque limit:
The torque is higher than the value in par. 4-16 (in motor operation) or
9
the torque is higher than the value in par. 4-17 (in regenerative opera-
tion).
WARNING/ALARM 13, Over Current:
The inverter peak current limit (approx. 200% of the rated current) is
exceeded. The warning will last approx. 8-12 sec., then the frequency
converter trips and issues an alarm. Turn off the frequency converter and
check if the motor shaft can be turned and if the motor size matches 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 itself.
Turn off the frequency converter and remove the earth fault.
ALARM 15, In-complete hardware:
A fitted option is not handled by the present control board (hardware or
software).
ALARM 16, Short-circuit:
There is short-circuiting in the motor or on the motor terminals.
Turn off the frequency converter and remove the short-circuit.
WARNING/ALARM 17, Control word timeout:
There is no communication to the frequency converter.
The warning will only be active when par. 8-04 is NOT set to
If par. 8-04 is set to Stop
converter ramps down until it trips, while giving an alarm.
par. 8-03 Control word Timeout Time
WARNING 25, Brake resistor short-circuited:
The brake resistor is monitored during operation. If it short-circuits, the
brake function is disconnected and the warning appears. The frequency
converter still works, but without the brake function. Turn off the fre-
quency converter and replace the brake resistor (see par. 2-15
Check
.
132
OFF
and Trip , a warning appears and the frequency
could possibly be increased.
MG.20.M4.02 - VLT
ALARM/WARNING 26, Brake resistor power limit:
The power transmitted to the brake resistor is calculated as a percentage,
as a mean value over the last 120 s, on the basis of the resistance value
of the brake resistor (par. 2-11) and the intermediate circuit voltage. The
warning is active when the dissipated braking power is higher than 90%.
Trip
If [2] has been selected in par. 2-13, the frequency converter cuts
out and issues this alarm, when the dissipated braking power is higher
than 100%.
WARNING 27, Brake chopper fault:
The brake transistor is monitored during operation and if it short-circuits,
the brake function disconnects and the warning comes up. The frequency
converter is still able to run, but since the brake transistor has short-
circuited, substantial power is transmitted to the brake resistor, even if it
is inactive. Turn off the frequency converter and remove the brake re-
sistor.
Warning: There is a risk of substantial power being
transmitted to the brake resistor if the brake transistor
is short-circuited.
ALARM/WARNING 28, Brake check failed:
Brake resistor fault: the brake resistor is not connected/working.
ALARM 29, Frequency converter over temperature:
If the enclosure is IP 20 or IP 21/TYPE 1, the cut-out temperature of the
o o
heat-sink is 95 C +5
temperature fault cannot be reset, until the temperature of the heatsink
o o
is below 70 C +5 C.
The fault could be:
- Ambient temperature too high
- Too long motor cable
ALARM 30, Motor phase U missing:
Motor phase U between the frequency converter and the the motor is
missing.
Turn off the frequency converter and check motor phase U.
ALARM 31, Motor phase V missing:
Motor phase V between the frequency converter and the motor is missing.
Turn off the frequency converter and check motor phase V.
ALARM 32, Motor phase W missing:
Motor phase W between the frequency converter and the motor is miss-
ing.
Turn off the frequency converter and check motor phase W.
ALARM 33, Inrush fault:
Too many power-ups have occurred within a short time period. See the
Specifications
chapter
minute.
.
WARNING/ALARM 34, Fieldbus communication fault:
The fieldbus on the communication option card is not working.
WARNING 35, Out of frequency range:
This warning is active if the output frequency has reached its
speed low
(par. 4-52) or
Process control, closed loop
converter is in
active in the display. If the frequency converter is not in this mode bit
008000 Out of frequency range
Brake
there is no warning in the display.
®
is a registered Danfoss trademark
VLT
Operating Instructions
C, dependent on size of frequency converter. The
for the allowed number of powerups within one
Warning speed high
(par. 4-53). If the frequency
(par. 1-00), the warning is
in extended status word is active but
®
AQUA Drive
Warning