6. Troubleshooting
No. Description Warning Alarm Trip Lock Cause of Problem
2 Live zero error X X Signal on terminal 53 or 60 is less than 50% of value set in par. 6-10, 6-12 and 6-22.
4
Mains phase loss
1)
X X X Missing phase on supply side, or too high voltage imbalance. Check supply voltage.
7
DC over voltage
1)
X X Intermediate circuit voltage exceeds limit.
8
DC under voltage
1)
X X Intermediate circuit voltage drops below “voltage warning low” limit.
9 Inverter overloaded X X More than 100% load for too long.
10 Motor ETR over temperature X X Motor is too hot due to more than 100% load for too long.
11 Motor thermistor over temperature X X Thermistor or thermistor connection is disconnected.
12 Torque limit X Torque exceeds value set in either par. 4-16 or 4-17.
13 Over Current X X X Inverter peak current limit is exceeded.
14 Earth fault X X Discharge from output phases to ground.
16 Short Circuit X X Short-circuit in motor or on motor terminals.
17 Control word timeout X X No communication to frequency converter.
25 Brake resistor short-circuited X X Brake resistor is short-circuited, thus brake function is disconnected.
27 Brake chopper short-circuited X X Brake transistor is short-circuited, thus brake function is disconnected.
28 Brake check X Brake resistor is not connected/working
29 Power board over temp X X X Heat-sink cut-out temperature has been reached.
30 Motor phase U missing X X Motor phase U is missing. Check the phase.
31 Motor phase V missing X X Motor phase V is missing. Check the phase.
32 Motor phase W missing X X Motor phase W is missing. Check the phase.
38 Internal fault X X Contact local Danfoss supplier.
47 Control Voltage Fault X X X 24 V DC may be overloaded.
51 AMT check U
nom
and I
nom
X Wrong setting for motor voltage, motor current and motor voltage.
52 AMT low I
nom
X Motor current is too low. Check settings.
59 Current limit X VLT overload.
63 Mechanical Brake Low X Actual motor current has not exceeded “release brake” current within “start delay” time window.
80
Drive Initialised to Default Value X All parameter settings are initialized to default settings.
1)
These faults may be caused by mains distortions. Installing Danfoss Line Filter
may rectify this problem.
Table 6.1: Code list
VLT Micro Drive FC 51 6. Troubleshooting
MG.02.C2.02 - VLT
®
is a registered Danfoss trademark
81
6
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