Lenze 8240 HVAC Series - Manual (Page 78)

Troubleshooting and fault elimination
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8.1.3 Maloperation of the drive
Maloperation Possible causes
Motor does not rotate
D
DC-bus voltage too low
(Red LED is blinking every 0.4 seconds; message LU is displayed)
D
Controller inhibited
(green LED is blinking, display of the operating module: OFF, STOP or AS_LC)
D
Setpoint = 0
D
DC braking active
D
Quick-stop function active
D
JOG setpoint activated and JOG frequency = 0
D
Fault message is displayed (see chapter 8.3 )
D
Mechanical motor brake is not released
Motor does not rotate
smoothly
D
Defective motor cable
D
Maximum current C022 and C023 too low
D
Motor underexcited or overexcited (check parameter setting)
Current consumption of
motor too high
D
Setting of C016 too high
D
Setting of C015 too low
D
C088 and C091 are not adapted to the motor data.
8.2 Fault analysis using the history buffer
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Structure of the history buffer
Code
C0168 Entry Note
C161 Memory location 1 Active fault
If the fault is no longer active or has been acknowledged:
D
The contents of the memory locations 1 3 will be saved in a
C162 Memory location 2 Last fault
D
The contents of the memory locations 1-3 will be saved in a
”higher” location.
C163 Memory location 3 Last but one fault
higher location.
D
The contents of the memory location 4 will be eliminated from
the history buffer and cannot be read any longer
C164 Memory location 4 Last but two fault
the history buffer and cannot be read any longer.
D
Memory location 1 will be deleted (= no active fault).
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