Parameter Details
12
12.3 b: Application
YASKAWA SIEPC71061753C GA500 Technical Manual 541
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 12.34
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 12.34 Time Chart for the Dwell Function at Start/Stop
■ b6-01: Dwell Reference at Start
No.
(Hex.)
Name Description
Default
(Range)
b6-01
(01B6)
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)
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)
■ b6-03: Dwell Reference at Stop
No.
(Hex.)
Name Description
Default
(Range)
b6-03
(01B8)
Dwell Reference at Stop
Sets the output frequency that the drive will hold momentarily when ramping to stop the motor.
0.0
(Determined by A1-02)
When the drive decelerates to the output frequency set in b6-03, it holds that frequency for the time set in b6-04
[Dwell Time at Stop] and starts to decelerate again.
■ b6-04: Dwell Time at Stop
No.
(Hex.)
Name Description
Default
(Range)
b6-04
(01B9)
Dwell Time at Stop
Sets the length of time for the drive to hold the output frequency when ramping to stop the motor.
0.0 s
(0.0 - 10.0 s)
◆ b8: Energy Saving
Energy-saving control improves overall system operating efficiency by operating the motor at its most efficient
level.
Set b8-01 and these parameters according to the control method and the motor.
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