YASKAWA U1000 Series - Page 187

5.2 b: Application
YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual 187
Parameter Details
5
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.
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 5.11
Figure 5.11 Run at the Frequency Reference
Setting 1: Coast to Stop
The motor is started first when the frequency reference is the setting of parameter E1-09 or more. 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 5.12
Figure 5.12 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 5.13
Figure 5.13 Run at the Minimum Frequency
No. Parameter Name Setting Range Default
b1-05 Action Selection below Minimum Output Frequency 0 to 3 0
Zero Speed
Control
b2-01 DC
Injection Braking
Start Frequency
Run
Command
Frequency
reference
Motor
Speed
OFF ON
Zero Speed
Control
E1-09 Min.
Output Frequency
b2-04
DC Injection Braking Time at Stop
E1-09
b2-03
DC Injection Braking Time at Start
IM: Initial Excitation
PM: Zero Spd. Contr.
b2-03
DC Injection Braking Time
at Start
IM: Initial Excitation
PM: Zero Spd. Contr.
b2-01 DC
Injection Braking
Start Frequency
Run
Command
Frequency
reference
Motor
Speed
OFF ON
Zero Speed
Control
E1-09 Min.
Output Frequency
b2-04
DC Injection Braking Time at Stop
Motor
Coasts
b2-01 DC
Injection Braking
Start Frequency
Run
Command
Frequency
reference
Motor
Speed
OFF ON
Zero Speed
Control
E1-09 Min.
Output Frequency
b2-04
DC Injection Braking Time at Stop
Run at
E1-09
Run at
E1-09
b2-03
DC Injection Braking Time at Start
IM: Initial Excitation
PM: Zero Spd. Contr.
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