Yaskawa CIMR-UU4A0034A [174/644] B3 50 b3 51 backspin search direction judgment time 1 2

Yaskawa CIMR-UU4A0021A [174/644] B3 50 b3 51 backspin search direction judgment time 1 2
Setting 0: Disabled
Setting 1: Enabled
n
b3-50/b3-51: Backspin Search Direction Judgment Time 1/2
The direction of the Speed Search is adjusted to allow for backspin.
When
momentary power loss time t is shorter than the time set in b3-50, the search operates according to the direction command.
When momentary power loss time t is equal to or longer than the time set in b3-51, the search operates from the opposite
direction of the direction command. When momentary power loss time t is equal to or longer than the time set in b3-50 and
shorter than b3-15, baseblock continues until momentary power loss time t exceeds the time set in b3-51. The search then
operates from the opposite direction of the direction command.
Note: 1. Use these parameters only in applications in which backspin can occur
2. Be sure to set b3-50 > b3-51.
No. Name Setting Range Default
b3-50 Backspin Search Direction Judgment Time 1 0.0 to 10.0
Determined by
A1-02
b3-51 Backspin Search Direction Judgment Time 2 0.0 to 10.0 0.0
Speed Search from the Direction Command (0.0 ≤ Momentary Power Loss Time t < b3-50)
When time t from the momentary power loss to recovery is shorter than the setting value of b3-50, Speed Search is performed
in the direction specified by the direction command. The deceleration time set in b3-52 is used for the search frequency and
the setting value of the maximum frequency is used as the starting search frequency.
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
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 maximum frequency is used as the starting search
frequency.
5.2 b: Application
174
YASKAWA ELECTRIC SIEP C710636 04C U1000 Industrial MATRIX Drive Technical Manual

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