5.2 b: Application
116 YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
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 5.9
Figure 5.9 Coast to Stop
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 5.10
Figure 5.10 Run at the Minimum Frequency
Setting 3: Zero Speed Control
The drive applies Zero Speed Control whenever the frequency reference setting is below the value of parameter E1-09.
When the Run command is removed, Zero Speed Control is activated for the time set in b2-04, even if it was already
active before.
Figure 5.11
Figure 5.11 Zero Speed Control
n b1-06: Digital Input Reading
This parameter defines how the digital inputs are read.
Setting 0: Read once
The state of a digital input is read once. If the state has changed, the input command is immediately processed. With this
setting the drive responds more quickly to digital inputs, but a noisy signal could cause erroneous operation.
No. Name Setting Range Default
b1-06 Digital Input Reading 0 or 1 1
b2-03
Zero Speed Time at Start
IM: Initial Excitation
PM: Zero Spd. Contr.
b2-01 Zero
Speed Level
Run
Command
Frequency
reference
Motor
Speed
OFF ON
Zero Speed
Control
E1-09 Min.
Frequency
b2-04
Zero Speed Time at Stop
Motor
Coasts
b2-01 Zero
Speed Level
Run
Command
Frequency
reference
Motor
Speed
OFF ON
Zero Speed
Control
E1-09 Min.
Frequency
b2-04
Zero Speed Time at Stop
Run at
E1-09
Run at
E1-09
b2-03
Zero Speed Time at Start
IM: Initial Excitation
PM: Zero Spd. Contr.
Zero
Speed
Control
b2-01 Zero
Speed Level
Run
Command
Frequency
reference
Motor
Speed
OFF ON
Zero Speed
Control
E1-09 Min.
Frequency
b2-04
Zero Speed Time at Stop
E1-09
b2-03
Zero Speed Time at Start
IM: Initial Excitation
PM: Zero Spd. Contr.
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