YASKAWA AC Drive-A1000 Technical Manual page 131

Setting 2: Run at the minimum frequency
When a Run command is active and the frequency reference is smaller than the parameter E1-09 setting, 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.
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.
n b1-06: Digital Input Reading
Defines how the digital inputs are read.
No.
b1-06
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.
Setting 1: Read twice
The state of a digital input is read twice. The input command is processed only if the state does not change during the double
reading. This reading process is slower than the "Read once" process, but it is more resistant to noisy signals.
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
Run OFF ON
Command
Frequency
reference
IM: Initial Excitation
PM: Zero Spd. Contr.
Motor
b2-03
Speed
Zero Speed Time at Start
Figure 5.9 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 5.10 Run at the Minimum Frequency
Run OFF ON
Command
Frequency
reference
Zero
Speed
IM: Initial Excitation
Control
PM: Zero Spd. Contr.
Motor
Speed b2-03
Zero Speed Time at Start
Figure 5.11 Zero Speed Control
Name
Digital Input Reading
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
E1-09 Min.
Frequency
Zero Speed
Control
E1-09
b2-01 Zero
Speed Level
b2-04
Zero Speed Time at Stop
Setting Range
5.2 b: Application
Default
0, 1 1
5
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