Parameter Details
12
12.3 b: Application
YASKAWA SIEPC71061753C GA500 Technical Manual 515
■ b2-18: Short Circuit Braking Current
No.
(Hex.)
Name Description
Default
(Range)
b2-18
(0177)
Short Circuit Braking
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 you can use b2-18 to set
a higher current level. The maximum rated current is 120% when the drive is set for Normal Duty (C6-01 = 1
[Normal Duty Rating]). The maximum rated current is 150% when the drive is set for Heavy Duty (C6-01 = 0
[Heavy Duty 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 [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 Table 12.27 for more information.
Table 12.27 Speed Search and Related Parameters
Parameter
Speed Estimation Current Detection 2
b3-24 = 1 b3-24 = 2
b3-01 [Speed Search at Start Selection] x x
b3-03 [Speed Search Deceleration Time] - x
b3-05 [Speed Search Delay Time] x x
b3-06 [Speed Estimation Current Level 1] x -
b3-07 [Speed Estimation Current Level 2] x -
b3-08 [Speed Estimation ACR P Gain] x -
b3-09 [Speed Estimation ACR I Time] x -
b3-10 [Speed Estimation Detection Gain] x -
b3-14 [Bi-directional Speed Search] x x
b3-17 [Speed Est Retry Current Level] x x
b3-18 [Speed Est Retry Detection Time] x x
b3-19 [Speed Search Restart Attempts] x x
b3-24 [Speed Search Method Selection] x (1) x (2)
b3-25 [Speed Search Wait Time] x x
b3-26 [Direction Determination Level] x -
b3-29 [Speed Search Back-EMF Threshold] - -
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
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