Parameter Details
12
12.2 b: APPLICATION
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual 529
■ b2-08 MagFlux Comp Value
No.
(Hex.)
Name Description
Default
(Range)
b2-08
(0190)
MagFlux Comp Value
Sets how much current the drive injects when DC Injection Braking at Start starts (Initial
Excitation) as a percentage of E2-03 [Mot No-Load Current].
0%
(0 - 1000%)
This parameter starts a high-capacity motor (motors with a large secondary circuit time constant). This function
can quickly increase motor flux to make high starting torque (a process called initial excitation).
The DC Injection Braking at start current level changes linearly from the value set in b2-08 to the value set in E2-
03, as shown in Figure 12.21.
Figure 12.21 DC Current Level during DC Injection Braking at Start
Note:
• If b2-08 < 100%, flux will develop very slowly.
• When b2-08 = 0% the DC current level will be the DC Injection current set in b2-02 [DCI Braking Current].
• If b2-08 is set too high, DC Injection Braking at start will make a loud audible noise. Adjust b2-08 to decrease the volume to the
permitted level.
■ 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 restarts a stopped PM motor. The drive short circuits all 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.
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