Yaskawa AC Drive P1000 Bypass Technical Manual - Manual (Page 90)

n b3-17: Speed Search Restart Current Level
Sets the current level at which Speed Estimation is restarted as a percentage of drive rated current to avoid overcurrent and
overvoltage problems since a large current can flow into the drive if the difference between the estimated frequency and the
actual motor speed is too big when performing Speed Estimation.
No. Name Setting Range Default
b3-17 Speed Search Restart Current Level 0 to 200% 150%
n b3-18: Speed Search Restart Detection Time
Sets the time for which the current must be above the level set in b3-17 before restarting Speed Search.
No. Name Setting Range Default
b3-18 Speed Search Restart Detection Time 0.00 to 1.00 s 0.10 s
n b3-19: Number of Speed Search Restarts
Sets the number of times the drive should attempt to find the speed and restart the motor. If the number of restart attempts
exceeds the value set to b3-19, the SEr fault will occur and the drive will stop.
No. Name Setting Range Default
b3-19 Number of Speed Search Restarts 0 to 10 3
n b3-24: Speed Search Method Selection
Sets the Speed Search method.
No. Parameter Name Setting Range Default
b3-24 Speed Search Method Selection 0, 1 0
Setting 0: Current Detection
Setting 1: Speed Estimation
Note: Refer to Current Detection Speed Search (b3-24 = 0) on page 86 and Refer to Speed Estimation Type Speed Search (b3-24 = 1) on page
87 for explanations of the Speed Search methods.
n b3-25: Speed Search Wait Time
Sets the wait time between Speed Search restarts. Increase the wait time if problems occur with overcurrent, overvoltage, or
if the SEr fault occurs.
No. Name Setting Range Default
b3-25 Speed Search Wait Time 0.0 to 30.0 s 0.5 s
n b3-27: Speed Search Start Analog Input
Starts Speed Search at 0 or at the given analog input value.
No. Name Setting Range Default
b3-27 Start Speed Search Select 0, 1 0
Setting 0: Start from 0
Setting 1: Start Speed
u b5: PID Control
The drive has a built-in Proportional + Integral + Derivative (PID) controller that uses the difference between the target value
and the feedback value to adjust the drive output frequency to minimize deviation and provide accurate closed loop control
of system variables such as pressure or temperature.
n P Control
The output of P control is the product of the deviation and the P gain so that it follows the deviation directly and linearly. With
P control, only an offset between the target and feedback remains.
5.2 b: Application
90 YASKAWA SIEP YAIP1B 01A YASKAWA AC Drive – P1000 Bypass Technical Manual