Troubleshooting - Danfoss VLT Micro Quick Manual

Quick Guide

1.6 Troubleshooting

No. Description
2 Live zero error
4 1)
Mains phase loss
7 1)
DC over voltage
8 1)
DC under voltage
9 Inverter overloaded
10 Motor ETR over temperature
11 Motor thermistor over
temperature
12 Torque limit
13 Over Current
14 Earth fault
16 Short Circuit
17 Control word timeout
25 Brake resistor short-circuited
27 Brake chopper short-circuited
28 Brake check
29 Power board over temp
30 Motor phase U missing
31 Motor phase V missing
32 Motor phase W missing
38 Internal fault
44 Earth fault
47 Control Voltage Fault
51 AMT check U and I
nom nom
52 AMT low I
nom
59 Current limit
63 Mechanical Brake Low
80 Drive Initialised to Default Value
84 The connection between drive
and LCP is lost
85 Button disabled
86 Copy fail
87 LCP data invalid
88 LCP data not compatible
89 Parameter read only
90 Parameter database busy
91 Parameter value is not valid in this
mode
92 Parameter value exceeds the
min/max limits
nw Not While RUNning
run
Err. A wrong password was entered
1)
These faults may be caused by mains distortions. Installing Danfoss Line Filter may rectify this problem.
Table 1.5 Warnings and AlarmsCode list
VLT Micro Drive Quick Guide
Warning Alarm Trip Error
Lock
X X
X X X
X X
X X
X X
X X
X X
X
X X X
X X
X X
X X
X X
X X
X
X X X
X X
X X
X X
X X
X X
X X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
®
MG.02.B6.02 - VLT is a registered Danfoss trademark
Cause of Problem
Signal on terminal 53 or 60 is less than 50% of value set in par.
6-10, 6-12 and 6-22.
Missing phase on supply side, or too high voltage imbalance. Check
supply voltage.
Intermediate circuit voltage exceeds limit.
Intermediate circuit voltage drops below "voltage warning low" limit.
More than 100% load for too long.
Motor is too hot due to more than 100% load for too long.
Thermistor or thermistor connection is disconnected.
Torque exceeds value set in either par. 4-16 or 4-17.
Inverter peak current limit is exceeded.
Discharge from output phases to ground.
Short-circuit in motor or on motor terminals.
No communication to frequency converter.
Brake resistor is short-circuited, thus brake function is disconnected.
Brake transistor is short-circuited, thus brake function is discon-
nected.
Brake resistor is not connected/working
Heat-sink cut-out temperature has been reached.
Motor phase U is missing. Check the phase.
Motor phase V is missing. Check the phase.
Motor phase W is missing. Check the phase.
Contact local Danfoss supplier.
Discharge from output phases to ground.
24 V DC may be overloaded.
Wrong setting for motor voltage and/or motor current.
Motor current is too low. Check settings.
VLT overload.
Actual motor current has not exceeded "release brake" current
within "start delay" time window.
All parameter settings are initialized to default settings.
No communication between LCP and frequency converter
See parameter group 0-4* LCP
An error occurred while copying from frequency converter to LCP or
vice versa.
Occurs when copying from LCP if the LCP contains erroneous data -
or if no data was uploaded to the LCP.
Occurs when copying from LCP if data are moved between
frequency converters with major differences in software versions.
Occurs when trying to write to a read-only parameter.
LCP and RS485 connection are trying to update parameters simulta-
neously.
Occurs when trying to write an illegal value to a parameter.
Occurs when trying to set a value outside the range.
Parameter can only be changed when the motor is stopped.
Occurs when using a wrong password for changing a password-
protected parameter.
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