Danfoss VLT AQUA Drive FC 202 Operating Instructions Manual page 144

9. Troubleshooting
WARNING/ALARM 8, DC under voltage:
If the intermediate circuit voltage (DC) drops below the "voltage warning
low" limit (see table above), the frequency converter checks if 24 V back-
up supply is connected.
If no 24 V backup supply is connected, the frequency converter trips after
a given time depending on the unit.
To check whether the supply voltage matches the frequency converter,
3.1 General 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. You cannot reset the frequency converter until the counter is be-
low 90%.
The fault is that the frequency converter is overloaded by more than
nominal current for too long.
WARNING/ALARM 10, Motor ETR over temperature:
According to the electronic thermal protection (ETR), the motor is too hot.
You can choose if you want the frequency converter to give a warning or
an alarm when the counter reaches 100% in par. 1-90 Motor
Protection
. The fault is that the motor is overloaded by more than nominal
current for too long. Check that the motor par. 1-24
correctly.
WARNING/ALARM 11, Motor thermistor over temp:
The thermistor or the thermistor connection is disconnected. You can
choose if you want the frequency converter to give a warning or an alarm
9
Thermal Protection
in par. 1-90 Motor
nected correctly 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 Torque
Mode (in motor operation) or the torque is higher than the value in par.
4-17 Torque Limit Generator Mode
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 Control
tion is NOT set to OFF .
144
.
Thermal
Motor Current
. Check that the thermistor is con-
Limit Motor
(in regenerative operation).
Timeout Func-
MG.20.M5.02 - VLT
Timeout Function
If par. 8-04 Control
appears and the frequency converter ramps down to zero speed, while
giving an alarm.
par. 8-03 Control Timeout Time
WARNING 22, Hoist Mech. Brake:
Report value will show what kind it is.
0 = The torque ref. was not reached before timeout
1 = There was no brake feedback before timeout
WARNING 23, Internal fans:
External fans have failed due to defect hardware or fans not mounted.
WARNING 24, External fan fault:
The fan warning function is an extra protection function that checks if the
fan is running / mounted. The fan warning can be disabled in par.
Monitor
14-53 Fan , [0] Disabled.
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
2-15 Brake Check ).
is set
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 Brake
ate circuit voltage. The warning is active when the dissipated braking
power is higher than 90%. If
Power Monitoring
2-13 Brake
sues this alarm, when the dissipated braking power is higher than 100%.
WARNING/ALARM 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 resistor.
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.
WARNING/ALARM 29, Drive over temperature:
If the enclosure isIP00, IP20/Nema1 or IP21/TYPE 1, the cut-out tem-
perature of the heat-sink is 95
be reset, until the temperature of the heatsink is below 70
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 motor is miss-
ing.
Turn off the frequency converter and check motor phase U.
®
is a registered Danfoss trademark
VLT
Operating Instructions
Stop Trip
is set to and , a warning
could possibly be increased.
replace the brake resistor (see
Resistor (ohm) ) and the intermedi-
Trip
[2] has been selected in par.
, the frequency converter cuts out and is-
o C +5 o C. The temperature fault cannot
o
C.
®
AQUA Drive
par.