12.2 b: APPLICATION
454 SIEPCYEUOQ2V01A Q2V Technical Manual
◆ b2: DC INJ / SHORT CKT BRAKE
b2 parameters set the DC Injection Braking and Short Circuit Braking functions.
• DC Injection Braking: A braking method that injects DC current into the motor windings. This function should
not be used too frequently, because it generates a fair amount of heat in the motor.
• Short Circuit Braking: A braking method for PM motors.
■ b2-01: ZSpd/DCI Threshold
No.
(Hex.)
Name Description
Default
(Range)
b2-01
(0189)
ZSpd/DCI Threshold
Sets the frequency to start DC Injection Braking or Short Circuit Braking.
Determined by A1-02
(0.0 - 10.0 Hz)
Note:
This parameter is available when b1-03 = 0 [Stopping Method Selection = Ramp->Stop].
When the control method selected in A1-02 [Control Method] changes, the b2-01 function changes.
Parameter Settings Functions of b2-01
A1-02 = 0, 2 [V/f Control or OLVector] Parameter b2-01 sets the frequency to start DC Injection Braking at stop. When the output frequency is less than or
equal to the value set in b2-01, the drive will inject the quantity of DC current set in b2-02 [DCI Braking Current] into
the motor for the time set in b2-04 [DC Inject Braking Time at Stop].
Figure 12.19 DC Injection Braking at Stop
Note:
When b2-01 ≤ E1-09 [Min Output Frequency], the drive will start DC Injection Braking from the frequency set in
E1-09.
A1-02 = 5, 6, or 8 [PM OLVector, PM AOLVector, or EZ
Vector]
Parameter b2-01 sets the frequency to start for Short Circuit Braking at stop. When the output frequency is less than or
equal to the value set in b2-01, the drive will do Short Circuit Braking for the time set in b2-13 [SCB Time@Stop].
When b2-04 > 0.00 s, the drive will complete Short Circuit Braking, then do DC Injection Braking for the time set in
b2-04.
Figure 12.20 Short Circuit Braking at Stop
Note:
When b2-01 ≤ E1-09, the drive will start Short Circuit Braking from the frequency set in E1-09. If b2-01 and E1-
09 = 0 Hz, the drive will not do Short Circuit Braking.
■ b2-02: DCI Braking Current
No.
(Hex.)
Name Description
Default
(Range)
b2-02
(018A)
DCI Braking Current
Sets the DC Injection Braking current as a percentage of the drive rated current.
50%
(0 - 75%)
When the DC Injection Braking current is more than 50%, the drive decreases the carrier frequency to 1 kHz. The
motor rated current determines how much DC Injection Braking current that the drive can use.
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