2.3 b: Application
170 YASKAWA TOEPYAIGA5002A GA500 DRIVE PROGRAMMING
Short Circuit Braking operates for the time set in b2-13 when output frequency is less than the value set in b2-01 [DC
Injection/Zero SpeedThreshold] or E1-09 [Minimum Output Frequency].
Set this parameter to 0.00 to disable the function.
Note:
Motor speed and load conditions can make it necessary to install a dynamic braking option on the drive.
■ 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 2.20 for more information.
Table 2.20 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] - -
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