Motor Phase Failure Monitoring - Lenze 8400 StateLine C Reference Manual

5.12.5

Motor phase failure monitoring


Note!
In the Lenze setting
monitoring is not activated!
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
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
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
output frequency of 0 Hz if none of the three motor phases reaches the threshold value set
in C00599.
 If the motor phase failure detection is tripped:
– The response set in
– The error message
– The bMctrlMotorPhaseFault status output of the
set to TRUE.

Note!
If the "1: Fault" error response is set in
bMctrlMotorPhaseFault status output of the SB
for only 1 second, as with pulse inhibit via the error response no motor phase
error can be detected anymore. The logbook and
the cause of the motor phase failure.
 The motor phase failure detection 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.
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(C00597 = "0: No response"), the motor phase failure
is already exceeded within the delay time, the motor phase failure
C00599
C00597 will take place.
"LP1: Motor phase
L
8400 StateLine C | Reference manual
C00597 (Lenze setting: "No Reaction")
being exceeded. Monitoring is activated at an
failure" is entered into the logbook.
LS_DeviceMonitor
C00597 and a motor phase fails, the
LS_DeviceMonitor
C00561/3...5
Motor control (MCTRL)
Monitoring
system block is
is set to TRUE
continue to show
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