YASKAWA Z1000U Technical Manual page 109

Momentary power loss time t
0
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.
Power supply voltage
Momentary power loss time t
0
Normal operation
Search in progress
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.
YASKAWA SIEP YAIZ1D 01C Z1000U HVAC MATRIX Drive Bypass Technical Manual
Forward operation
Normal operation b3-50
b3-51
Search in progress
t
Figure 5.7 Speed Search from Forward Run Command (0 ≤ t < b3-50)
Forward operation
b3-50
b3-51
Figure 5.8 Continuous Baseblock (b3-50 ≤ t < b3-51)
b3-52
b3-53
t
5.2 b: Application
5
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