Lenze 8400 TopLine - Manual (Page 300)

5 Motor control (MCTRL)
5.13 Monitoring
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Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
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5.13.6 Motor phase failure monitoring
In order to safely detect the failure of a motor phase, a certain motor current must flow for the
current sensor system. Thus, the response set in C00597 (Lenze setting: "No Reaction") is caused
after a delay time of maximally 2 s after controller enable if a current-carrying motor phase U, V, W
fails or if motor connection is missing. If the current threshold value set in C00599 is already
exceeded within the delay time, the motor phase failure monitoring starts from this point in time.
The monitoring mode checks the current flow for each motor phase as a function of the
commutation angle. Monitoring is activated if a commutation angle of approx. 140° is covered
without the current set in C00599 being exceeded. Monitoring is activated at an output frequency
of 0 Hz if none of the three motor phases reaches the threshold value set in C00599 .
• If the motor phase failure monitoring is tripped:
• The response set in C00597 will take place.
• The error message " LP1: Motor phase failure " is entered into the logbook.
• The bMctrlMotorPhaseFault status output of the LS_DeviceMonitor system block is set to
TRUE.
• The motor phase failure monitoring is inactive if
• a controller inhibit is set,
• connection to a rotating machine is carried out (flying restart circuit or connection to actual
speed value),
• an error is pending due to a DC-bus overvoltage (" OU "),
• motor parameter identification is carried out,
• DC-injection braking is active.

Note!
In the Lenze setting ( C00597 = "0: No Reaction"), the motor phase failure monitoring is
not activated!
In the case of a synchronous motor,
• the motor phase failure monitoring is basically deactivated. (Due to the low no-load
current, the monitoring would be permanently activated.)
• only the Motor phase error monitoring before operation is active (for Lenze setting
C2866/2 = "1: Yes").

Note!
If an error response of "1: Fault" is set in C00597 , the bMctrlMotorPhaseFault status
output of the LS_DeviceMonitor SB will be set to TRUE for only 1 second in the event of
a motor phase failure because it is no longer possible to detect a motor phase fault via
the error response with a pulse inhibit. However, the Logbook and C00561/3...5 still
display the cause of the motor phase failure.