Yaskawa Matrix Converter - Manual (Page 223)

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„ Example of Momentary Power Loss
Figure 6.42 shows an example of what happens in the MxC if a momentary power loss occurs when: L2-01 is
set to 1, L2-02 to 0.5, L2-03 to 0.7, or b3-05 to 0.2.
If the power is restored within the momentary power loss ridethrough time, MxC will carry out speed search
and normal operation will automatically restart after completing the power resonance.
Fig 6.42 Example when Momentary Power Loss Occurs
If the momentary power loss time is longer than the momentary power loss ridethrough time, an FDV alarm
(Power Supply Frequency Fault) will occur and the MxC will stop the operation.
Power-supply status
Control power voltage
Power error detection time:
Approx. 2 ms
MxC operation status Normal operation Baseblock
∗2
(BB) Speed search Normal operation
Min. baseblock time
Speed search
waiting time
Power error detected
(L2-03) : 0.7 s
(b3-05) : 0.2 s
Power resonance time
Momentary power loss time
UV level
∗1
* 1. The baseblock will be released after completing L2-03, UV time, b3-05,
and the power resonance time.
* 2. The motor will be in coasting to a stop during baseblock. Take measures
if there is possibility that the coasting to a stop cause the problem.