5.2 b: Application
142 YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
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. 12
Figure 5.12 Zero Speed Control
■ 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.
Setting 1: Read twice
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.
■
b1-07: LOCAL/REMOTE Run Selection
The drive has three separate control sources that can be switched using digital inputs (H1- = 1 (LOCAL/REMOTE
Selection) or 2 (External reference 1/2)) or the LO/RE key on the digital operator. Refer to Setting 1: LOCAL/REMOTE
selection on page 215, Refer to Setting 2: External reference 1/2 selection on page 216 and Refer to o2-01: LO/RE
(LOCAL/REMOTE) Key Function Selection on page 285 for details.
• LOCAL: Digital operator. The digital operator is used to set the frequency reference and Run command.
• REMOTE: External reference 1. The frequency reference and Run command source are set by b1-01 and b1-02.
• REMOTE: External reference 2. The frequency reference and Run command source are set by b1-15 and b1-16.
When switching from LOCAL to REMOTE, or between External reference 1 and External reference 2, the Run
command may already be present at the location the source was switched to. Parameter b1-07 can be used to determine
how the Run command is treated in this case.
Setting 0: Run command must be cycled
When the Run command source is different in the old and new source (e.g., the old source was the terminals and the new
source is serial communication), and the Run command is active at the new source as the switch over occurs, the drive
will not start or will stop operation if it was running before. The Run command has to be cycled at the new source in
order to start the drive again.
Setting 1: Accept Run command at the new source
When the Run command is active at the new source, the drive starts or continues operation if it was running before.
WARNING! The drive may start unexpectedly if switching control sources when b1-07 = 1. Clear all personnel away from rotating
machinery and electrical connections prior to switching control sources. Failure to comply may cause death or serious injury.
No. Name Setting Range Default
b1-06 Digital Input Reading 0 or 1 1
No. Parameter Name Setting Range Default
b1-07 LOCAL/REMOTE Run Selection 0 or 1 0
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