Yaskawa iQpump Programming Manual - Manual (Page 171)

YASKAWA TM.iQp.02 iQpump Drive Programming Manual 171
Figure 1.132
Figure 137 PI Feedback Response Characteristics
The iQpump offers programmable acceleration and deceleration ramps. Each parameter has a setting range of 0.0 to 6000.0 seconds.
Acceleration Time: This is the time it takes to accelerate from 0 Hz to Maximum Output Frequency defined by parameter E1-04.
Deceleration Time: This is the time it takes to decelerate from Maximum Output Frequency defined by parameter E1-04 to 0 Hz.
Example: C1-01 Acceleration Time 1 programmed for 30 seconds, E1-04 Maximum Output Frequency set to 60 Hz. It will take the
iQpump Controller 20 seconds to accelerate from 0 to 40 Hz (40 Hz ÷ 60 Hz x 30 sec = 20 sec).
Example: C1-02 Deceleration Time 1 programmed for 50 seconds, E1-04 Maximum Output Frequency set to 60 Hz. It will take the
iQpump Controller 10 seconds to decelerate from 60 to 30 Hz (30 Hz ÷ 60 Hz x 50 sec = 25 sec).
■
Factory Default Settings for C1-01 Acceleration Time and C1-02 Deceleration Time is
25.0 Seconds
Thrust Bearing Operation (see “P4-04 Thrust Bearing Acceleration Time: on page 156 ) uses a separate acceleration time defined by
parameter P4-04. Once Thrust frequency is reached, the iQpump drive returns to its normal acceleration time set by C1-01.
Pre-Charge mode uses C1-01 as its acceleration time.
Hand Mode Operation uses C1-01 and C1-02 for acceleration and deceleration time.
Auto Mode can use acceleration time C1-05 and deceleration time C1-06, depending on parameter P3-12 setting (see section. P3-12
Delta Setpoint Feedback Acc/Dec Changeover on page 155 .)
◆ System Response During Normal Automatic Operation (P3-12)
Acceleration and Deceleration times can automatically be adjusted during Automatic Setpoint regulation to improve system stability.
■
Enable Alternate Acceleration / Deceleration Ramps based on Set-Point and Feedback Level
To enabled the alternate acceleration and deceleration time, parameter P3-12 has to be programmed to a value greater than 0.
Please refer to section P3-12 Delta Setpoint Feedback Acc/Dec Changeover on page 155 for a detailed explanation.
◆ Friction Compensation for Single Pump Systems (P3-13, P3-14)
Please refer to section P3-13 Friction Compensation Start Frequency on page 156 and P3-14 Maximum Friction Increase at
Maximum Frequency on page 156 for a detailed explanation.
◆ Friction Compensation for Multi-Pump Systems (P3-07, P3-08)
Please refer to section P3-07 Multi Pump Setpoint Increase on page 151 and P3-08 Multi Pump Setpoint Decrease on page 152 for a
detailed explanation.