Motor phase failure detection
The motor phase failure detection function can be activated for both synchronous
and asynchronous motors.
In the "SLSM-PSM" motor control mode, detection for motor phase failure is deactivated if HF injection is active in the low-speed range.
Preconditions
Motor phase failure detection during operation is suitable for applications
which are operated with a constant load and speed. In other cases,
transient processes or unfavourable operating points can cause erroneous triggering to occur.
Details
If a current-carrying motor phase (U, V, W) fails during operation, the response selected in 0x2D45:001 (P310.01) is tripped and a logbook entry is made.
Exception: With the setting "No response [0]", no logbook entry is made.
A motor phase failure can only be detected if
1.
the rated motor current is higher than 10 % of the rated inverter current and
2.
the output frequency is not lower than 0.1 Hz (standstill).
The lower the output frequency the longer the detection of the motor phase failure.
Parameter
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Address
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Name / setting range / [default setting]
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Information
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0x2D45:001
(P310.01)
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Motor phase failure detection: Response - Motor phase 1
(Mot.phase.fail.: Response)
|
Selection of the response following the detection of a motor phase failure during operation.
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0
|
No response
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||
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1
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Warning
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||
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2
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Trouble
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||
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3
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Fault
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||
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0x2D45:002
(P310.02)
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Motor phase failure detection: Current threshold
(Mot.phase.fail.: Current thresh.)
1.0 ... [5.0] ... 25.0 %
|
Current threshold for the activation of the motor phase failure detection function.
–
100 % = Rated motor current 0x6075 (P323.00)
–
Display of the present motor current in 0x2D88 (P104.00).
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0x2D45:003
(P310.03)
|
Motor phase failure detection: Voltage threshold
(Mot.phase.fail.: Voltage thresh.)
0.0 ... [10.0] ... 100.0 V
|
Voltage threshold for motor phase monitoring
for the VFC control mode (0x2C00 (P300.00) = 6).
–
The monitoring function is triggered if the motor current exceeds the rated motor current-dependent current threshold for longer than 20 ms. Rated motor current 0x6075 (P323.00)
–
In case of the V/f characteristic control, the voltage threshold is considered additionally for the motor phase failure detection. If the motor voltage is higher than the voltage threshold, monitoring is combined with the motor current.
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Severity