12.2 b: APPLICATION
456 SIEPCYEUOQ2V01A Q2V Technical Manual
■ b2-12: SCB Time@Start
No.
(Hex.)
Name Description
Default
(Range)
b2-12
(01BA)
SCB Time@Start
Sets the Short Circuit Braking time at start.
0.00 s
(0.00 - 25.50 s)
This function stops and restarts a coasting PM motor. The drive short circuits all the three motor phases to make
braking torque in the motor.
Set this parameter to 0.00 to disable the function.
Note:
• Short circuit Braking will let external forces rotate the PM motor. Use DC Injection Braking to prevent motor rotation from external
forces.
• Motor speed and load conditions can make it necessary to install a dynamic braking option on the drive.
■ b2-13: SCB Time@Stop
No.
(Hex.)
Name Description
Default
(Range)
b2-13
(01BB)
SCB Time@Stop
Sets the Short Circuit Braking time at stop.
A1-02 = 8: 0.00 s
Other than A1-02 = 8: 0.50
s
(0.00 - 25.50 s)
This function fully stops a PM motor with a large inertia during deceleration and will not let the inertia continue to
rotate the motor.
Short Circuit Braking operates for the time set in b2-13 when output frequency is less than the value set in b2-01
[ZSpd/DCI Threshold] or E1-09 [Min 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: 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 Table 12.10 for more information.
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