B6: Dwell Function - YASKAWA GA800 Technical Reference

12.3 b: Application
■
b5-94: EZ Sleep Wake-up Level
No.
Name
(Hex.)
b5-94 EZ Sleep Wake-up Level
(0B94)
RUN
Note:
The values of b5-20 [PID Unit Selection], b5-38 [PID User Unit Display Scaling], and b5-39 [PID User Unit Display Digits] set the units.
When b5-20, b5-38, and b5-39 change, this parameter does not automatically update. Set this parameter again after you change b5-20, b5-38,
and b5-39 are changed.
• When b5-95 = 0 [EZ Sleep Wake-up Mode = Absolute]:
When b5-09 = 0 [PID Output Level Selection = Normal Output (Direct Acting)], and the PID Feedback [H3-xx =
B] is less than the value of b5-94 for a time longer than the value of b5-96 [EZ Sleep Wake-up Time], the drive will
exit sleep and start operation again. When b5-09 = 1 [Reverse Output (Reverse Acting)], and the PID feedback is
more than setting value of b5-94 for a time longer than the setting value of b5-96, the drive will exit sleep and start
operation again.
• When b5-95 = 1 [Setpoint Delta]:
When b5-09 = 0, and the PID feedback is less than the value of "PID setpoint value - b5-94" for a time longer than
the value of b5-96, the drive will exit sleep and start operation again. When b5-09 = 1, and the PID feedback is
more than the value of "PID setpoint value + b5-94" for a time longer than the setting value of b5-96, the drive will
exit sleep and start operation again.
■
b5-95: EZ Sleep Wake-up Mode
No.
Name
(Hex.)
b5-95 EZ Sleep Wake-up Mode
(0B95)
0 : Absolute
1 : Setpoint Delta
■
b5-96: EZ Sleep Wake-up Time
No.
Name
(Hex.)
b5-96 EZ Sleep Wake-up Time
(0B96)
RUN
When the PID feedback is less than the value of b5-94 [EZ Sleep Wake-up Level] continuously for the time set in b5-
96, the drive will exit sleep and start operation again.
◆

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.
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].
760
V/f CL-V/f OLV CLV AOLV
Sets the level at which the drive resumes operation when exiting Sleep Mode.
V/f CL-V/f OLV CLV AOLV
Sets the wake-up mode to use when exiting Sleep Mode.
V/f CL-V/f OLV CLV AOLV
Sets the EZ Wake-up time.
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
YASKAWA SIEPC71061737D GA800 Drive Technical Reference
Default
(Range)
0.00%
(0.00 - 600.00%)
Default
(Range)
0
(0, 1)
Default
(Range)
1.0 s
(0.0 - 1000.0 s)
Figure 12.40