Parameter Details
12
12.2 b: APPLICATION
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual 527
■ b1-35 DI Deadband Time
No.
(Hex.)
Name Description
Default
(Range)
b1-35
(1117)
Expert
DI Deadband Time
Sets the deadband time for MFDIs.
0.0 ms
(0.0 to 100.0 ms)
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.
◆ 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, Short Circuit Braking, and Zero Servo.
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.
• 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].
Figure 12.18 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]
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.
Figure 12.19 Short Circuit Braking at Stop
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