YASKAWA A1000 Technical Manual page 155

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 5.14
Setting 3: Zero Speed Control
The drive applies Zero Speed Control whenever the frequency reference setting is below the value of parameter E1-09.
Removing the Run command when the drive is operating at or above the frequency set to E1-09 will activate Zero Speed
Control for the time set in b2-04, regardless of whether Zero Speed Control was already active.
Figure 5.15

b1-06: Digital Input Reading
This parameter defines how the digital inputs are read. The inputs are acted upon every 1 ms or 2 ms depending upon the
setting.
No.
b1-06
Setting 0: Read once (1 ms scan)
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 (2 ms scan)
The state of a digital input is read twice. Only if the state does not change during the double reading, the input command
is processed. This reading process is slower but more resistant against noisy signals.
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
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 5.14 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 5.15 Zero Speed Control
Name
Digital Input Reading
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
b2-01 Zero E1-09
Speed Level
b2-04
Zero Speed Time at Stop
Setting Range
5.2 b: Application
Control
Default
0 or 1 1
5
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