YASKAWA GA500 series, Programming

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2.3 b: Application
172 YASKAWA TOEPYAIGA5002A GA500 Programming
Parameter
Speed Estimation Current Detection 2
b3-24 = 1 b3-24 = 2
b3-31 [Spd Search Current Reference Lvl] - x
b3-32 [Spd Search Current Complete Lvl] - x
b3-33 [Speed Search during Uv Selection] x x
b3-54 [Search Time] - -
b3-55 [Current Increment Time] - -
b3-56 [InverseRotationSearch WaitTime] - x
Note:
• To use Speed Estimation Speed Search with V/f Control, do Rotational Auto-Tuning before you set the Speed Search function. If the wire
length between the drive and motor changed since the last time you did Auto-Tuning, do Stationary Auto-Tuning for Line-to-Line
Resistance process again.
• If A1-02 = 5, 6 [PM Open Loop Vector, PM Advanced Open Loop Vector] and the wiring distance between the motor and drive is long or if
the motor is coasting at more than or equal to 120 Hz, do not use Speed Search to restart the motor. Use Short Circuit Braking.
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Current Detection 2
Use this Speed Search function with induction motors. Set b3-24 = 2 [Speed Search Method Selection = Current
Detection 2] . Current Detection Speed Search injects current into the motor to detect the speed of an induction motor.
Speed Search increases the output voltage for the time set in L2-04 [Powerloss V/f Recovery Ramp Time] , starting
from the maximum output frequency or the frequency reference.
Figure 2.21 Current Detection 2 after Momentary Power Loss
Note:
Once power is restored, the drive will not execute Speed Search until the time set in b3-05 [Speed Search Delay Time] has passed. Thus, the
drive will not always start Speed Search although the time set in L2-03 [Minimum Baseblock Time] is expired.
If you enter the Run command at the same time as Speed Search, the drive will not do Speed Search until the time set
in
L2-03 is expired. When the value set in L2-03 < b3-05 , the drive will use the wait time set in b3-05 .
Figure 2.22 Speed Search Selection at Start (Current Detection Type)