Danfoss vlt AQUA Instruction Manual page 154

9 Troubleshooting
Alarm/warning limits:
Voltage Range
Undervoltage
Voltage warning low
Voltage warning high (w/o
brake - w/brake)
Overvoltage
The voltages stated are the intermediate circuit voltages of the ad-
justable frequency drive with a tolerance of ± 5%. The correspond-
ing AC line voltage is the intermediate circuit voltage (DC link)
divided by 1.35.
WARNING/ALARM 8, DC undervoltage:
If the intermediate circuit voltage (DC) drops below the "voltage warning
low" limit (see table above), the adjustable frequency drive checks if 24
V backup supply is connected.
If no 24 V backup supply is connected, the adjustable frequency drive
trips after a given period of time, depending on the unit.
To check whether the supply voltage matches the adjustable frequency
3.1 General Specifications
drive, see
WARNING/ALARM 9, Inverter overloaded:
The adjustable frequency drive is about to cut out because of an overload
(too high current for too long). The counter for electronic, thermal inver-
ter protection gives a warning at 98% and trips at 100%, while giving an
alarm. You cannot reset the adjustable frequency drive until the counter
is below 90%.
The fault is that the adjustable frequency drive has been overloaded by
more than nominal current for too long.
9
WARNING/ALARM 10, Motor ETR overtemperature:
According to the electronic thermal protection (ETR), the motor is too hot.
You can choose if you want the adjustable frequency drive to give a
warning or an alarm when the counter reaches 100% in par. 1-90
Thermal Protection
. The fault is that the motor has been overloaded by
more than nominal current for too long. Make sure that the motor par.
Motor Current
1-24 is set correctly.
WARNING/ALARM 11, Motor thermistor overtemp:
The thermistor or the thermistor connection is disconnected. You can
choose if you want the adjustable frequency drive to give a warning or
an alarm in par. 1-90 Motor Thermal Protection
is connected correctly between terminal 53 or 54 (analog voltage input)
and terminal 50 (+10 V supply), or between terminal 18 or 19 (digital
input PNP only) and terminal 50. If a KTY sensor is used, make sure the
connection between terminal 54 and 55 is correct.
WARNING/ALARM 12, Torque limit:
The torque is higher than the value in par. 4-16
Mode
(in motor operation) or the torque is higher than the value in
Torque Limit Generator Mode
par. 4-17
WARNING/ALARM 13, Overcurrent:
The inverter peak current limit (approximately 200% of the rated current)
is exceeded. The warning will last approximately 8–12 sec., then the ad-
justable frequency drive trips and issues an alarm. Turn off the adjustable
frequency drive and check if the motor shaft can be turned and if the
motor size matches the adjustable frequency drive.
9-4
3 x 200–240 V AC 3 x 380–500 V AC
[VDC] [VDC]
185 373
205 410
390/405 810/840
410 855
.
Motor
. Make sure the thermistor
Torque Limit Motor
(in regenerative operation).
MG.20.M5.22 - VLT
ALARM 14, Ground fault:
There is a discharge from the output phases to ground, either in the cable
between the adjustable frequency drive and the motor or in the motor
itself.
Turn off the adjustable frequency drive and remove the ground fault.
ALARM 15, Incomplete hardware:
A fitted option is not handled by the present control board (hardware or
software).
ALARM 16, Short-circuit:
There is a short-circuit in the motor or on the motor terminals.
Turn off the adjustable frequency drive and remove the short-circuit.
WARNING/ALARM 17, Control word timeout:
There is no communication to the adjustable frequency drive.
The warning will only be active when par. 8-04
tion is NOT set to OFF .
Control Timeout Function
If par. 8-04
appears and the adjustable frequency drive ramps down to zero speed,
while giving an alarm.
Control Timeout Time
par. 8-03 could possibly be increased.
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 defective 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
Fan Monitor
par. 14-53 , [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 adjustable
frequency drive still works, but without the brake function. Turn off the
adjustable frequency drive and replace the brake resistor (see
Brake Check
par. 2-15 ).
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 based on the resistance value of the
brake resistor (par. 2-11 Brake Resistor (ohm)
cuit voltage. The warning is active when the dissipated braking energy is
Trip
higher than 90%. If [2] has been selected in par. 2-13
Monitoring
, the adjustable frequency drive cuts out and issues this alarm,
when the dissipated braking energy 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 is issued. The adjustable
frequency drive 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 adjustable frequency drive and remove the brake resistor.
®
is a registered Danfoss trademark
®
VLT AQUA Drive
Instruction Manual
Control Timeout Func-
Stop Trip
is set to and , a warning
) and the intermediate cir-
Brake Power