YASKAWA HV600 Technical Reference page 199

b3-02: SpeedSearch Deactivation Current
b3-03: Speed Search Deceleration Time
b3-05: Speed Search Delay Time
Note:
After you restore power, the drive will not do Speed Search until the time set in b3-05 [Speed Search Delay Time] expires. This means that
the drive will not always start Speed Search when time set in L2-03 [Minimum Baseblock Time] expires.
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 expires. When L2-03 < b3-05, the drive will use the wait time set in b3-05.
b3-02: SpeedSearch Deactivation Current
b3-03: Speed Search Deceleration Time
Figure 5.17 Speed Search Selection at Start (Current Detection Type)
WARNING! Sudden Movement Hazard. Do not do Current Detection Speed Search with light loads or a stopped motor. If you do
Auto-Tuning in these conditions, the motor can suddenly accelerate and cause serious injury or death.
Note:
• If the drive detects oL1 [Motor Overload] during Current Detection Speed Search, decrease b3-03.
• If the drive detects oC [Overcurrent] or ov [Overvoltage] during Current Detection Speed Search after the drive recovers from a
momentary power loss, increase L2-03.
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Speed Estimation
Use this Speed Search function with induction motors. Set b3-24 = 1 [Speed Search Method Selection = Speed
Estimation]. This function uses less current and has a shorter search time than other functions. This function lets you
do Speed Search when the motor is rotating in reverse. When you return power after a power loss, the motor will not
suddenly accelerate.
YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
Figure 5.16 Current Detection 2 after a Momentary Power Loss
L2-03: Minimum Baseblock Time
L2-04: Powerloss V/f Recovery Ramp Time
L2-03: Minimum Baseblock Time
L2-04: Powerloss V/f Recovery Ramp Time
5.2 b: Application
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