YASKAWA
SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
197
When the DC Injection Braking current is more than 50%, the drive decreases the carrier frequency to 1 kHz. The
motor rated current determines the quantity of 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.
■
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 Injection Braking Time at stop.
0.00 s
(0.00 - 10.00 s)
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. Enable DC Injection
Braking or Speed Search to prevent
ov [Overvoltage]
and
oC [Overcurrent]
faults.
■
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 Injection Braking Time at stop.
0.00 s
(0.00 - 10.00 s)
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 necessary to stop the motor, increase the value.
■
b2-09: Pre-heat Current 2
No.
(Hex.)
Name
Description
Default
(Range)
b2-09
(01E1)
Pre-heat Current 2
Sets the percentage of motor rated output current used for the motor pre-heat function.
5%
(0 - 100%)
◆
b3: Speed Search
The Speed Search function detects the actual speed of a coasting motor, then restarts the motor before the motor stops.
Use Speed Search in these conditions:
•
To continue operation after momentary power loss
•
To switch from commercial power supply to drive power
•
To restart a coasting fan
For example, the drive output turns off and the motor coasts when there is a momentary loss of power. After you
return power, the drive does Speed Search on the coasting motor, and restarts the motor from the detected speed.
There are two types of Speed Search for induction motors: Current Detection and Speed Estimation. Use parameter
b3-24 [Speed Search Method Selection]
to select the type of Speed Search.
Parameter settings are different for different types of Speed Search. Refer to
for more information.
Table 5.20 Speed Search and Related Parameters
Parameters
Speed Estimation
Current Detection 2
b3-24 = 1
b3-24 = 2
b3-01 [Speed Search at Start Selection]
x
x
b3-03 [Speed Search Deceleration Time]
-
x
Summary of Contents for H6B1A002
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Page 454: ...5 14 Z Bypass Parameters 454 YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference...
Page 590: ...8 6 Storage Guidelines 590 YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference...
Page 780: ...11 3 European Standards 780 YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference...
