Omron Q2A Series Technical Manual page 528

12.2 b: APPLICATION
Note:
When b2-01 ≤ E1-09 [Min Output Frequency], 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.
• A1-02 = 3 or 7 [CLVector or PM CLVector] or A1-02 = 4 [Adv OLVector] and n4-72 = 2 [With PG]
In these control methods, b2-01 sets the starting frequency for Zero Speed Control at Stop. When the output
frequency is less than or equal to the value set in b2-01, the drive will do Zero Speed Control for the time set in
b2-04.
Note:
When b2-01 ≤ E1-09 [Min Output Frequency], the drive will start Short Circuit Braking from the frequency set in E1-09.
■
b2-02 DCI Braking Current
No.
Name
(Hex.)
b2-02 DCI Braking Current
(018A)
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.
The DC Injection Braking current level has an effect on the strength of the magnetic field that locks the motor
shaft. As the current level increases, the motor windings will supply more heat. Do not set this parameter higher
than the level that is necessary to hold the motor shaft.
Note:
When A1-02 = 4 [Control Method = Adv OLVector] and n4-72 = 2 [Spd Fbk Mode = With PG], the drive ignores the b2-02 setting and
does initial excitation.
■
b2-03 DCInj Time@Start
No.
Name
(Hex.)
b2-03 DCInj Time@Start
(018B)
This function stops then restarts a coasting motor and increases motor flux to make high starting torque (a process
called initial excitation). Set this parameter to 0.00 to disable the function.
Note:
To restart a coasting motor, use DC Injection Braking to stop and then restart the motor, or enable Speed Search. DC Injection Braking
can trigger ov [Overvoltage] or oC [Overcurrent].
■
b2-04 DCInj Time@Stop
No.
Name
(Hex.)
b2-04 DCInj Time@Stop
(018C)
This function fully stops a motor with a large inertia during deceleration and will not let the inertia continue to
rotate the motor.
Set this parameter to 0.00 to disable the function.
When a longer time is required to stop the motor, increase the value.
528
Figure 12.20 Zero Speed Control at Stop
V/f CL-V/f OLV CLV AOLV
Sets the DC Injection Braking current as a percentage of the drive rated current.
V/f CL-V/f OLV CLV AOLV
Sets the DC Injection Braking Time at stop. Sets the zero speed control at stop in CLV, AOLV, or
CLV/PM.
V/f CL-V/f OLV CLV AOLV
Sets the DC Injection Braking Time at stop. Sets the zero speed control at stop in CLV, AOLV, or
CLV/PM.
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
Default
(Range)
50%
(0 - 100%)
Default
(Range)
A1-02 = 4: 0.03 s
Other than A1-02 = 4: 0.00
s
(0.00 - 10.00 s)
Default
(Range)
Determined by A1-02
(0.00 - 10.00 s)