12.2 b: APPLICATION
530 SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
■ b2-18 SCB Current
No.
(Hex.)
Name Description
Default
(Range)
b2-18
(0177)
SCB Current
Sets the Short Circuit Braking Current as a percentage of the motor rated current.
100.0%
(0.0 - 200.0%)
The Short Circuit Braking current cannot be higher than the drive rated current, although a higher current level
can be set using b2-18. The maximum rated current is 120% when the drive is set for Normal Duty (C6-01 = 1
[ND Rating]). The maximum rated current is 150% when the drive is set for Heavy Duty (C6-01 = 0 [HD
Rating]).
◆ 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 [SpSrch@Start Selection].
There are two types of Speed Search for induction motors: Current Detection and Speed Estimation. Use
parameter b3-24 [SpSrch Method Selection] to select the type of Speed Search.
Parameter settings are different for different types of Speed Search. Refer to the following table for more
information.
Table 12.7 Speed Search and Related Parameters
Parameter Current Detection 2 Speed Estimation
b3-01 [SpSrch@Start Selection] x x
b3-03 [SpSrch Deceleration Time] x -
b3-05 [SpSrch Delay Time] x x
b3-06 [Speed Curr Lev1 for Estimation] - x
b3-07 [Speed Curr Lev2 for Estimation] - x
b3-08 [Speed ACR PGain for Estimation] - x
b3-09 [Speed ACR ITime for Estimation] - x
b3-10 [Speed Det Gain for Estimation] - x
b3-14 [Speed Bi-Directional Search] - x
b3-17 [Speed Retry Current Level] x x
b3-18 [Speed Retry Delay] x x
b3-19 [Speed Retry Times] x x
b3-24 [SpSrch Method Selection] x (2) x (1)
b3-25 [SpSrch Wait Time] x x
b3-26 [Dir. Determ. Level] - x
b3-27 [SS@RUNbeforeBB] x x
b3-29 [SpSrch BackEMF Threshold] - -
b3-31 [SpSrch I Ref Level] x -
b3-32 [SpSrch I End Level] x -
b3-33 [SpSrch@Uv Selection] x x
b3-35 [BckEMF Low Detection Level] x x
b3-36 [HiBackEMF DetLev] x x
b3-54 [Search Time] - -
b3-55 [Speed Curr Rise Time] - -
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