B2: Dc Inj / Short Ckt Brake - Omron Q2A Series Technical Manual

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b1-35 DI Deadband Time
No.
Name
(Hex.)
b1-35 DI Deadband Time
(1117)
Expert
When the on/off time for MFDIs is longer than the time set in b1-35, the drive activates the MFDI. Set this
parameter to prevent malfunctions caused by relay chattering for applications in which relays send input to MFDI
terminals.
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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.
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b2-01 ZSpd/DCI Threshold
No.
Name
(Hex.)
b2-01 ZSpd/DCI Threshold
(0189)
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.
• A1-02 = 0, 1, 2, or 4 [V/f Control, PG V/f Control, OLVector, or Adv OLVector] and n4-72 = 1[Spd Fbk Mode =
Without PG]
In these control methods, b2-01 sets the starting frequency for 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 [DCInj Time@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]
In these control methods, b2-01 sets the starting frequency 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.
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
V/f CL-V/f OLV CLV AOLV
Sets the deadband time for MFDIs.
V/f CL-V/f OLV CLV AOLV
Sets the frequency to start DC Injection Braking, Short Circuit Braking, and Zero Servo.
Figure 12.18 DC Injection Braking at Stop
Figure 12.19 Short Circuit Braking at Stop
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
12.2 b: APPLICATION
Default
(Range)
0.0 ms
(0.0 to 100.0 ms)
Default
(Range)
Determined by A1-02
(0.0 - 10.0 Hz)
527
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