YASKAWA A1000 Technical Manual page 154

5.2 b: Application

b1-04: Reverse Operation Selection
For some applications, reverse motor rotation is not appropriate and may cause problems (e.g., air handling units, pumps,
etc.).
Note: Setting parameter b1-04 to 1 instructs the drive to ignore any Reverse run commands.
No.
b1-04
Setting 0: Reverse operation enabled
Possible to operate the motor in both forward and reverse directions.
Setting 1: Reverse operation disabled
Drive disregards a Reverse run command or a negative frequency reference.

b1-05: Action Selection below Minimum Output Frequency (CLV and CLV/PM)
Parameter b1-05 sets the operation when the frequency reference is lower than the minimum output frequency set in
parameter E1-09.
No.
b1-05
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 5.12
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 5.13
154
Parameter Name
Reverse Operation Selection
Parameter Name
Action Selection below Minimum Output Frequency
OFF ON
Run
Command
Frequency
reference
Zero Speed
IM: Initial Excitation
PM: Zero Spd. Contr.
Motor
b2-03
Speed
Zero Speed Time at Start
Figure 5.12 Run at the Frequency Reference
OFF ON
Run
Command
Frequency
reference
IM: Initial Excitation
PM: Zero Spd. Contr.
Motor
b2-03
Speed
Zero Speed Time at Start
Figure 5.13 Coast to Stop
E1-09 Min.
Frequency
Control
E1-09
b2-01 Zero
Speed Level
Zero Speed Time at Stop
E1-09 Min.
Frequency
Motor
Coasts
b2-01 Zero
Speed Level
b2-04
Zero Speed Time at Stop
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
Setting Range
0 or 1
Setting Range
0 to 3
Zero Speed
Control
b2-04
Zero Speed
Control
Default
0
Default
0