B6: Dwell Function - YASKAWA P1000 Technical Manual

5.2 b: Application
n b5-47: PID Output Reverse Selection 2
Determines whether a negative PID output reverses the direction of drive operation. When the PID function is used to trim
the frequency reference (b5-01 = 3 or 4), this parameter has no effect and the PID output will not be limited
(same as b5-11 = 1).
No.
b5-47
Setting 0: Reverse Disabled
Negative PID output will be limited to 0 and the drive output will be stopped.
Setting 1: Reverse Enabled
Negative PID output will cause the drive to run in the opposite direction.
n
Fine-Tuning PID
Follow the directions below to fine tune PID control parameters:
Goal
Suppress overshoot
Achieve stability quickly while
allowing some overshoot
Suppress long cycle oscillations
(longer than the integral time setting)
Suppress short cycle oscillations
u

b6: Dwell Function

The Dwell function temporarily holds the frequency reference at a predefined value for a set time then continues accelerating
or decelerating.
The Dwell function helps prevent speed loss when starting and stopping a heavy load with induction motors.
174
Name
PID Output Reverse Selection 2
Table 5.12 PID Fine Tuning
Tuning Procedure
• Reduce the derivative time (b5-05)
• Increase the integral time (b5-03)
• Decrease the integral time (b5-03)
• Increase the derivative time (b5-05)
Increase the integral time (b5-03)
• If oscillation cycle time is close to the
derivative time, reduce the derivative
time (b5-05).
• If the derivative time is set to 0.00 s and
oscillations are still a problem, reduce
the proportional gain (b5-02) or increase
the PID primary delay time (b5-08)
Setting Range
0, 1
Result
Response
Response
Response
Response
YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
Default
1
Before adjustment
After adjustment
Time
After adjustment
Before adjustment
Time
Before adjustment
After adjustment
Time
Before adjustment
After adjustment
Time