YASKAWA HV600 Manual page 191

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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.
b3-02:
b3-03:
b3-05:
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:
b3-03:
Figure 2.19 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:
• You cannot use Current Detection Speed Search with PM motors.
• If the motor is rotating in reverse, you cannot do Speed Search.
• 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.
YASKAWA TOEPYAIHV6002A HV600 Drive Programming
Figure 2.18 Current Detection 2 after a Momentary Power Loss
L2-03:
L2-04:
L2-03:
L2-04:
2.3 b: Application
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