Lenze 8400 motec - Manual (Page 306)

9 Diagnostics & error management
9.8 Error messages of the operating system
306 Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05
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oU: DC bus overvoltage [xx.0123.00014]
LU: DC bus undervoltage [xx.0123.00015]
oC1: Power section - short circuit [xx.0123.00016]
Response (Lenze setting printed in bold)
 No Reaction  Fault  Trouble  WarningLocked
Cause Remedy
The device has detected an overvoltage in the DC bus. To
protect the device hardware, the inverter control is
switched off.
• Depending on the configuration of the auto-start lock
function, set C00142 so that, when this error is
tripped, the controller only restarts after the control-
ler inhibit has been switched.
• If this error message remains active longer than the
time set in C00601 , a "Fault" is tripped.
• Reduce load in generator mode.
• Use a brake resistor.
• Use a regenerative power supply unit.
• Establish a DC-bus connection.
Response (Lenze setting printed in bold) Setting: C00600/1 ( Adjustable response)
 No Reaction  Fault  Trouble  WarningLocked
Cause Remedy
The device has detected a DC bus undervoltage. The in-
verter control is switched off because the drive proper-
ties of the motor control cannot be provided anymore
due to the DC bus undervoltage.
• Depending on the configuration of the auto-start lock
function, set C00142 so that, when this error is
tripped, the controller only restarts after the control-
ler inhibit has been switched.
• Switch on mains supply or ensure sufficient supply via
DC bus.
• Adjust setting in C00142 if required.
Response (Lenze setting printed in bold)
 No Reaction  Fault  Trouble  WarningLocked
Cause Remedy
The device has recognised a short circuit of the motor
phases. To protect the device electronics, the inverter
control is switched off.
• Mostly, incorrectly executed motor connections are
the cause.
• If the device is inappropriately dimensioned with re-
gard to the motor load and the current limitation in
the controller (Imax controller) is set incorrectly, this
error message may also occur.
 Motor control: Defining current limits
• Check motor connections and the corresponding plug
connector on the device.
• Only use permissible combinations of device power
and motor power.
• Do not set the dynamics of the current limitation con-
troller too high.