YASKAWA U1000 - Page 204

b3-52
Motor speed
Output frequency
Power supply voltage
0
Momentary power loss time t
Normal operation
Search in progress
b3-50
b3-51
Forward operation
t
Figure 5.19 Speed Search from Forward Run Command (0 ≤ t < b3-50)
Continuous Baseblock (b3-50 ≤ t < b3-51)
When time t from the momentary power loss to recovery is between the times set for b3-50 and b3-51, operation will not be
restarted and the baseblock will continue. The drive will stay in baseblock for the time set in b3-51 even after restoring power.
After the time set in b3-51 passes, Speed Search starts in the opposite direction of the direction command. The deceleration
time in b3-53 is used for the search frequency and the setting value of the frequency reference is used as the starting search
frequency.
Motor speed
Output frequency
Power supply voltage
0
Normal operation
Search in progress
b3-50
b3-51
b3-53
Forward operation
t
Momentary power loss time t
Figure 5.20 Continuous Baseblock (b3-50 ≤ t < b3-51)
Speed Search in Direction Opposite to Direction Command (b3-51 ≤ t)
When time t from the momentary power loss to recovery exceeds the setting value of b3-51, Speed Search is performed in the
opposite direction of the direction command. The deceleration time in b3-53 is used for the search frequency and the setting
value of the frequency reference is used as the starting search frequency.
5.2 b: Application
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YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual