YASKAWA A1000 Series Technical Manual page 141

Setting 0: Follow the Frequency Reference
The drive adjusts the motor speed following the speed reference, even if the frequency reference is below the setting of
parameter E1-09. When the Run command is removed and the motor speed is smaller than the setting of b2-01, Zero
Speed Control (not position lock) is performed for the time set in parameter b2-04 before the drive output shuts off.
Figure 5.9
Setting 1: Coast to Stop
The motor is started first when the frequency reference exceeds the setting of parameter E1-09. Once the motor is
running and the frequency reference falls below E1-09 the drive output is shut off and the motor coasts. When the motor
speed falls below the zero speed level set in parameter b2-01, Zero Speed Control is activated for the time set in b2-04.
Figure 5.10
Setting 2: Run at the minimum frequency
Whenever a Run command is active and the frequency reference is smaller than the value of parameter E1-09, the drive
runs the motor at the speed set in E1-09. When the Run command is removed, the drive decelerates the motor. As soon as
the motor speed reaches the zero speed level set in b2-01, Zero Speed Control is activated for the time set in b2-04.
Figure 5.11
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
Run OFF ON
Command
Frequency
reference
Zero Speed
IM: Initial Excitation
Control
PM: Zero Spd. Contr.
Motor
b2-03
Speed
Zero Speed Time at Start
Figure 5.9 Run at the Frequency Reference
Run OFF ON
Command
Frequency
reference
IM: Initial Excitation
PM: Zero Spd. Contr.
Motor
b2-03
Speed
Zero Speed Time at Start
Figure 5.10 Coast to Stop
Run OFF ON
Command
Frequency
reference
Run at
IM: Initial Excitation
E1-09
PM: Zero Spd. Contr.
Motor
Speed b2-03
Zero Speed Time at Start
Figure 5.11 Run at the Minimum Frequency
E1-09 Min.
Frequency
Zero Speed
E1-09
b2-01 Zero
Speed Level
b2-04
Zero Speed Time at Stop
E1-09 Min.
Frequency
Motor
Coasts
Zero Speed
b2-01 Zero
Control
Speed Level
b2-04
Zero Speed Time at Stop
E1-09 Min.
Frequency
Run at
Zero Speed
E1-09
Control
b2-01 Zero
Speed Level
b2-04
Zero Speed Time at Stop
5.2 b: Application
common_TMonly
Control
common_TMonly
common_TMonly
5
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