B3: Speed Search - YASKAWA HV600 Manual

2.3 b: Application
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b3: Speed Search

The Speed Search function detects the actual speed of a coasting motor, then restarts the motor before the motor stops.
Use Speed Search in these conditions:
• To continue operation after momentary power loss
• To switch from commercial power supply to drive power
• To restart a coasting fan
For example, the drive output turns off and the motor coasts when there is a momentary loss of power. After you
return power, the drive does Speed Search on the coasting motor, and restarts the motor from the detected speed.
When you use a PM motor, enable b3-01 [Speed Search at Start Selection].
There are two types of Speed Search for induction motors: Current Detection and Speed Estimation. Use parameter
b3-24 [Speed Search Method Selection] to select the type of Speed Search.
Parameter settings are different for different types of Speed Search. Refer to
Parameters
b3-01 [Speed Search at Start Selection]
b3-03 [Speed Search Deceleration Time]
b3-05 [Speed Search Delay Time]
b3-06 [Speed Estimation Current Level 1]
b3-07 [Speed Estimation Current Level 2]
b3-08 [Speed Estimation ACR P Gain]
b3-09 [Speed Estimation ACR I Time]
b3-10 [Speed Estimation Detection Gain]
b3-14 [Bi-directional Speed Search]
b3-17 [Speed Est Retry Current Level]
b3-18 [Speed Est Retry Detection Time]
b3-19 [Speed Search Restart Attempts]
b3-24 [Speed Search Method Selection]
b3-25 [Speed Search Wait Time]
b3-26 [Direction Determination Level]
b3-27 [Speed Search RUN/BB Priority]
b3-29 [Speed Search Back-EMF Threshold]
b3-31 [Spd Search Current Reference Lvl]
b3-32 [Spd Search Current Complete Lvl]
b3-33 [Speed Search during Uv Selection]
b3-54 [Search Time]
b3-55 [Current Increment Time]
b3-56 [InverseRotationSearch WaitTime]
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 [PM 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 200 Hz, do not use Speed Search to restart the motor. Use Short Circuit Braking.
190
Table 2.22 Speed Search and Related Parameters
Speed Estimation
b3-24 = 1
x
-
x
x
x
x
x
x
x
x
x
x
x (1)
x
x
x
-
-
-
x
-
-
-
Table 2.22 for more information.
Current Detection 2
b3-24 = 2
x
x
x
-
-
-
-
-
x
x
x
x
x (2)
x
-
x
-
x
x
x
-
-
x
YASKAWA TOEPYAIHV6002A HV600 Drive Programming