YASKAWA ELECTRIC
SIEP C710617 19A YASKAWA AC Drive CR700 Technical Manual
553
Figure 11.22 DC Injection Braking at Stop
Note:
When
b2-01
is less than or equal to the value set in
E1-09 [Minimum Output Frequency]
, the drive will start DC Injection Braking from
the frequency set in
E1-09
.
•
A1-02 = 3 [CLV]
, or
A1-02 = 4 [AOLV]
and
n4-72 = 1 [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
.
Figure 11.23 Zero Speed Control at Stop
Note:
When
b2-01
is less than or equal to the value set in
E1-09
, the drive will start Zero Speed Control from the frequency set in
E1-09
.
b2-02: DC Injection Braking Current
No.
(Hex.)
Name
Description
Default
(Range)
b2-02
(018A)
DC Injection Braking
Current
Sets the DC Injection Braking current as a percentage of the drive rated
current.
50%
(0 - 100%)
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 Selection = AOLV]
and
n4-72 = 1 [Speed Feedback Mode = With Encoder]
, the drive ignores the
b2-
02
setting and does initial excitation.
b2-03: DC Inject Braking Time at Start
No.
(Hex.)
Name
Description
Default
(Range)
b2-03
(018B)
DC Inject Braking
Time at Start
Sets the DC Inject Braking Time at start. Sets the Zero Speed Control time
at start in CLV.
0.00 s
(0.00 - 10.00 s)
This function is used to stop a coasting motor and restart it, or to increase motor flux to create high starting torque
(a process called initial excitation). A setting of 0.00 disables this function.
Note:
To restart a coasting motor, use DC Injection Braking to stop and then restart the motor. DC Injection Braking may trigger
ov
[Overvoltage]
or
oC [Overcurrent]
.
b2-04: DC Inject Braking Time at Stop
No.
(Hex.)
Name
Description
Default
(Range)
b2-04
(018C)
DC Inject Braking
Time at Stop
Sets the DC Inject Braking Time at stop. Sets the Zero Speed Control time
at stop in CLV.
Determined by A1-02
(0.00 - 10.00 s)
This function is used to completely stop a motor with a large inertia during deceleration, and prevent the inertia
from causing the motor to continue rotating.
A setting of 0.00 disables this function.
V/f
CL-V/f
OLV
CLV
AOLV
V/f
CL-V/f
OLV
CLV
AOLV
V/f
CL-V/f
OLV
CLV
AOLV
