1.2 b: Application
52
YASKAWA ELECTRIC
SIEP C710606 10A YASKAWA AC Drive - V1000 PRELIM. Programming Manual
Figure 1.14
Figure 1.14 Speed Search at Start
* 1. The wait time for Speed Search (b3-05) determines the lower limit.
Note:
If the Run command is quickly switched off and then back on again when the drive is set to
“Coast to stop” as the stopping method, Speed Search will operate as shown in
Notes on Using Speed Estimation Type Speed Search
• Auto-Tuning needs to be first performed if you plan to use Speed Estimation. Perform
Auto-Tuning again if the there is change in the cable length between the drive and motor.
• Use Current Detection to search for speeds beyond 130 Hz or 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 very long.
Current Detection should be used in such situations.
• Use Current Detection instead of Speed Estimation when operating motors smaller than
1.5 kW. Speed Estimation can end up stopping smaller motors as it might not be able to
detect the speed or rotation direction of such small motors.
• Use Short circuit Braking instead of Speed Estimation when using Open Loop Vector
Control for PM motors along with a fairly long motor cable.
• Use Short circuit Braking instead of Speed Estimation if attempting to find the speed of a
motor coasting faster than 120 Hz in Open Loop Vector Control for PM motors.
■
Current Detection Type Speed Search (b3-24 = 0)
Current Detection Speed Search can be applied to any motor. Be aware that sudden
acceleration may occur when using Current Detection with relatively light loads.
This method detects the motor speed by reducing the output frequency and measuring the
current. The frequency reduction starts from the maximum output frequency or from the set
frequency reference. As long as the output frequency is higher than the rotor speed, the slip
Run command
Output
frequency
Output
current
OFF
ON
b3-02
Starts at the speed
speed that was detected
Waits twice as long as L2-04
Frequency reference
set to the drive
Decelerates at the Speed
Search decel time set to b3-03
1.0 s
Min. Baseblock Time (L2-03)
*
Содержание OYMC V1000
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