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YASKAWA A1000 Series Technical Manual

YASKAWA A1000 Series
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5.2 b: Application
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual 161
Parameter Details
5
b6: Dwell Function
The Dwell function is used to temporarily hold the frequency reference at a predefined value for a set time, then continue
accelerating or decelerating.
If used with induction motors, the Dwell function can help prevent speed loss when starting and stopping a heavy load. If
running a PM motor in V/f control, the pause in acceleration allows the PM motor rotor to align with the stator field of
the motor, thus reducing the starting current.
The figure below shows how the Dwell function works.
Note: Using the Dwell function requires that the stopping method for the drive be set to “Ramp to stop” (b1-03 = 0).
Figure 5.26
Figure 5.26 Dwell Function at Start and Stop
b6-01, b6-02: Dwell Reference, Dwell Time at Start
b6-01 determines the frequency that is held or the time set in b6-02 during acceleration.
b6-03, b6-04: Dwell Reference, Dwell Time at Stop
Parameter b6-03 determines the frequency that is held for the time set in b6-04 during deceleration.
Suppress long cycle oscillations (longer than
the integral time setting)
Increase the integral time (b5-03)
Suppress short cycle oscillations
If oscillation cycle time is close to the derivative
time, the derivative part is likely having too much
influence. Reduce the derivative time (b5-05).
If the derivative time is set to 0.00 s and
oscillations are still a problem, try reducing the
proportional gain (b5-02) or try increasing the
PID primary delay time (b5-08)
No. Name Setting Range Default
b6-01
Dwell Reference at Start
0.0 to 400.0 Hz 0.0 Hz
b6-02
Dwell Time at Start
0.0 to 10.0 s 0.0 s
No. Name Setting Range Default
b6-03
Dwell Reference at Stop
0.0 to 400.0 Hz 0.0 Hz
b6-04
Dwell Time at Stop
0.0 to 10.0 s 0.0 s
Goal Tuning Procedure Result
Response
Before adjustment
After adjustment
Time
Response
After adjustment
Before adjustment
Time
b6-01
b6-03
b6-02 b6-04
Run Command
Output Frequency
ON
OFFOFF
common_TMonly

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YASKAWA A1000 Series Specifications

General IconGeneral
SeriesA1000
TypeAC Drive
AltitudeUp to 1000m without derating
Output Frequency0-400 Hz
Control MethodV/f Control
Overload Capacity150% for 60 seconds
Communication OptionsModbus, DeviceNet, Profibus, Ethernet/IP
Ambient Temperature-10 to 50°C
Storage Temperature-20 to 60°C
Humidity5% to 95% (non-condensing)
Enclosure RatingIP20
Horsepower0.5 to 1000 HP
Power Range0.4 - 630 kW (varies by voltage and model)
Protection FeaturesOvercurrent, Overvoltage, Undervoltage, Overheat
Cooling MethodFan Cooled
SafetySafe Torque Off (STO)

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