YASKAWA LA500 - B6: Dwell Function

12.2 b: Application
286 YASKAWA SIEPYEULA5001C LA500 Technical Manual
■ b4-01: Timer Function ON-Delay Time
No.
(Hex.)
Name Description
Default
(Range)
b4-01
(01A3)
Timer Function ON-Delay
Time
Sets the ON-delay time for the timer input.
0.0 s
(0.0 - 3000.0 s)
■ b4-02: Timer Function OFF-Delay Time
No.
(Hex.)
Name Description
Default
(Range)
b4-02
(01A4)
Timer Function OFF-Delay
Time
Sets the OFF-delay time for the timer input.
0.0 s
(0.0 - 3000.0 s)
◆ b6: Dwell Function
The Dwell function momentarily holds the output frequency at start and stop.
This prevents motor speed loss when you start and stop heavy loads. The Dwell function is also enabled when
backlash on the machine side causes sudden movement at the start of acceleration and deceleration.
At the start of acceleration, the drive uses the output frequency and acceleration time set for the Dwell function to
automatically operate at low speed to minimize the effects of backlash. Then, the drive can accelerate again. The
Dwell function operates the same for deceleration.
For conveyor applications, the Dwell function also lets the drive interlock the output frequency and a delay time
for the holding brake on the load side.
The Dwell function momentarily stops during acceleration to prevent a PM motor from stepping out. Figure 12.2
shows how the Dwell function works.
Note:
When you use the Dwell function at stop, set b1-03 = 0 [Stopping Method Selection = Ramp to Stop].
Figure 12.2 Time Chart for the Dwell Function at Start/Stop
■ b6-01: Dwell Reference at Start
No.
(Hex.)
Name Description
Default
(Range)
b6-01
(01B6)
Expert
Dwell Reference at Start
Sets the output frequency that the drive will hold momentarily when the motor starts.
0.0
(Determined by A1-02)
When the drive accelerates to the output frequency set in b6-01, it holds that frequency for the time set in b6-02
[Dwell Time at Start], and starts to accelerate again.
■ b6-02: Dwell Time at Start
No.
(Hex.)
Name Description
Default
(Range)
b6-02
(01B7)
Expert
Dwell Time at Start
Sets the length of time that the drive will hold the output frequency when the motor starts.
0.0 s
(0.0 - 10.0 s)
V/f
OLV
V/f
OLV
V/f
OLV
V/f
OLV