Yaskawa CIMR-UU4A0034A [169/644] Current detection speed search 2 b3 24 2

Yaskawa CIMR-UU2A0154A [169/644] Current detection speed search 2 b3 24 2
AC Power supply
Output frequency
Minimum Baseblock Time (L2-03)
b3-05
Figure 5.17 Timing Chart for Speed Search after Recovery from Momentary Power Loss
When performing a speed search operation at start, the speed search operation will start after waiting for the longer of the
times set in
b3-05 and L2-03 after the Run command input is received. When induced voltage remains in the motor, the Speed
Search operation starts after the time set in b3-05 without waiting for the time set in L2-03.
Run command
Output
frequency
Minimum Baseblock
Time (L2-03)
b3-05
Figure 5.18 Timing Chart for Speed Search at Start
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Current Detection Speed Search 2 (b3-24 = 2)
Current Detection Speed Search 2 is for use with IM motors. The current set in b3-31 is applied and the speed is detected
based
on the
current flow to the motor. After Speed Search is completed, the speed is accelerated or decelerated to the frequency
reference. If the output current during the Speed Search operation is larger than the setting value of b3-32, reduce the frequency
for the deceleration time set in b3-03. After motor speed estimation is completed, the speed is accelerated or decelerated to
the frequency reference.
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Speed Estimation Speed Search (b3-24 = 1)
A Speed Estimation Speed Search estimates the motor speed while the motor is coasting and then restarts operation. After the
Speed Search is completed, the speed is accelerated or decelerated to the frequency reference.
This method can be used for a single induction motor connected to a drive. Do not use this method if the motor is one or more
frame size smaller than the drive, at motor speeds above 200 Hz, or when using a single drive to operate more than one motor.
Notes on Using Speed Estimation Speed Search
Perform Rotational Auto-Tuning for V/f Control (T1-01 = 3) prior to using Speed Estimation in V/f Control and perform
Stationary Auto-Tuning for Line-to-Line Resistance (T1-01 = 2) again if the there is a change in the cable length between
the drive and motor.
Use Current Detection Speed Search 2 to search for speeds beyond 200 Hz if the application is running multiple motors
from the same drive or if the motor is considerably smaller than the capacity of the drive.
Speed Estimation may have trouble finding the actual speed if the motor cable is very long. Use Current Detection Speed
Search 2 in these instances.
Use Current Detection Speed Search 2 instead of Speed Estimation when operating motors smaller than 1.5 kW because
Speed Estimation might not be able to detect the speed or rotation of these smaller motors, in which case Speed Estimation
would stop the motor.
5.2 b: Application
YASKAWA ELECTRIC SIEP C710636 04C U1000 Industrial MATRIX Drive Technical Manual
169
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Parameter Details

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