Yaskawa CIMR-UU4A0034A [170/644] Rotation direction detection conditions for backspin

Yaskawa CIMR-UU2A0192F [170/644] Rotation direction detection conditions for backspin
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Speed Search Activation
Speed
Search can
be activated using any of the methods 1 through 5 described below. Select the Speed Search type in parameter
b3-24 independent of the activation method.
Method 1. Automatically activate Speed Search with every Run command. Set b3-01, Speed Search Selection at Start, to 1
(Enabled). External Speed Search commands are ignored.
Method 2. Activate Speed Search using the digital input terminals.
Use the input functions for H1-oo in Table 5.7.
Table 5.7 Speed Search Activation by Digital Inputs
Setting Description b3-24 = 1 b3-24 = 2
61
External Search
Command 1
Activate Speed Estimation
Speed Search
Closed: Activate Current Detection Speed Search from the
maximum output frequency (E1-04).
62
External Search
Command 2
Closed: Activate Current Detection Speed Search from the
frequency reference.
To activate Speed Search by a digital input, the input must be set together with the Run command or the Run command must
be entered after giving the Speed Search command.
Method 3. After automatic fault restart.
When the number of maximum fault restarts in parameter L5-01 is set higher than 0, the drive will automatically perform
Speed Search as specified by b3-24 following a fault.
Method 4. After momentary power loss.
This mode requires
that the Power Loss Ride-Thru function is enabled during CPU operation (L2-01 = 1 or 2). Refer to L2-01:
Momentary Power Loss Operation Selection on page 283.
Method 5. After external baseblock is released.
The drive will resume the operation starting with Speed Search if the Run command is present and the output frequency is
above the minimum frequency when the Baseblock command (H1-oo = 8 or 9) is released.
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Rotation Direction Detection Conditions for Backspin
Backspin occurs when the motor rotates in the opposite direction from the rotation direction command. Specify the speed
search direction when power is recovered after a momentary power loss in applications in which backspin can occur, such as
for an oil pump when backspin may occur due to the weight of the oil after a momentary power loss. The search starts from
the rotation direction specified in the direction command when the momentary power loss time is short. The search starts from
the opposite direction of the direction specified in the direction command when the momentary power loss time is long. The
rotation for the Speed Search is determined as follows:
[t] is the time from the momentary power loss to recovery.
0 ≤ t < b3-50: The search is started in the direction specified by the direction command.
b3-50 ≥ t < b3-51: The motor is not restarted and the baseblock continues.
The search starts from the opposite direction of the direction command when the momentary power loss time exceeds the
setting value of b3-51.
b3-51 ≤ t: The search is started in the direction opposite to the direction command.
Refer to b3-50/b3-51 Backspin Search Direction Judgment Time 1/ 2 on page 174 for details on the backspin direction
judgment time.
Note: 1. 1. Set b3-50 to the required time to enable rotation direction detection for backspin.
2. When setting b3-50, be sure to also set the following parameters to the values specified. Setting these parameters to any other values
will trigger an oPE08 fault.
b3-50 ≤b3-51
b3-14 = 0
b3-24 = 2
3. . Backspin detection is not necessary with a PM motor.
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b3-01: Speed Search Selection at Start
Determines if Speed Search is automatically performed when a Run command is issued.
5.2 b: Application
170
YASKAWA ELECTRIC SIEP C710636 04C U1000 Industrial MATRIX Drive Technical Manual

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