Lenze 8200 Frequency inverters - Manual (Page 237)

Troubleshooting and fault elimination
8200SHB0199 8-2
8.1.3 Maloperation of the drive
Maloperation Possible causes
Motor does not rotate - DC-bus voltage too low
(Red LED is blinking every 0.4 seconds, message LU is indicated)
- Controller inhibited
(Green LED is blinking, display of the operating module: OFF, STOP or AS_LC)
- Setpoint = 0
- DC braking active
- Quick-stop function active
- JOG setpoint activated and JOG frequency = 0
- Fault message is displayed (see chapter 8.3)
- Mechanical motor brake is not released
Motor does not rotate
smoothly - Defective motor cable
- Maximum current C022 and C023 too low
- Motor underexcited or overexcited (check parameter setting)
Current consumption of
motor too high - Setting of C016 too high
- Setting of C015 too low
- C088 and C091 are not adapted to the motor data
8.2 Fault analysis with the history buffer
The history buffer is used to trace faults. The fault messages are stored in the
history buffer in the order of their occurrence.
The memory locations can be retrieved via the codes.
Structure of the history buffer
Code Memory unit Entry Note
C161 Memory unit 1 Active fault If the fault is no longer active or has been acknowledged:
- The contents of the memory locations 1 - 3 will be saved in a
C162 Memory unit 2 Last fault
- The contents of the memory locations 1 - 3 will be saved in a
”higher” location.
The contents of the memory location 4 will be eliminated from
C163 Memory unit 3 Last but one fault
”higher” location.
- The contents of the memory location 4 will be eliminated from
the history buffer and cannot be read any longer.
C164 Memory unit 4 Last but two fault
the history buffer and cannot be read any longer.
- Memory location 1 will be deleted (= no active fault).
8.3 Fault messages
Display Fault Cause Remedy
--- No fault - -
EEr External fault (TRIP-Set) A digital input assigned to the TRIP-Set
function has been activated. Check external encoder
H05 Internal fault Contact Lenze
LP1 Motor phase failure - Failure of one or several motor
phases
- Motor current too low
Check motor cables, check V
min
setting,
connect motor with corresponding power or
adapt motor under C599.
LU Undervoltage DC-bus voltage too low - Check mains voltage
- Check supply module
OC1 Short-circuit Short-circuit Find out cause of short circuit; check cable OC1 Short-circuit
Excessive capacitive charging current of
the motor cable Use shorter motor cables or cables with less
capacitance
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