Yaskawa iQpump Controller Programming Manual - Manual (Page 171)

YASKAWA TM.iQp.07 iQpump Controller Programming Manual 171
Figure 1.124
Figure 128. Anti-No-Flow - Leaks / Very Low Flow
Table 69 Parameters
Table 70 Monitors <0034>
◆ P2-24 Anti-No Flow Detection Time
<0034>
Setting Range: 1.0 ~ 60.0 s
Factory Default: 10.0 s
Refer to parameter P2-24 in Appendix A for description details.
◆ P2-25 Anti-No Flow Release Level
<0034>
Setting Range: 1.0 ~ 100.0 psi
Factory Default: 3.0 psi
Refer to parameter P2-25 in Appendix A for description details.
Parameter
No.
Addr.
Hex
Parameter Name
Digital Operator Display
Description Range Default
Menu
Location
P2-23

822
Anti-No-Flow Bandwidth
ANF Bandwidth
Sets the amount of PI “Error” bandwidth used to detect the No-Flow
condition.
Operation can become less stable if this value is set too high. A
setting of 0.000% disables this feature.
0.00 ~
2.00%
0.40% Programming
P2-24
 823
Anti-No-Flow Detection Time
ANF Det Time Sets the time delay after No-Flow is detected before the drive starts
its increased deceleration rate. 1.0 ~
60.0 s
10.0 s Programming
P2-25

<0034>
824
Anti-No-Flow Release Level
ANF Release Lvl
Once the Anti-No-Flow activates (after the P2-24 time), the feedback
must drop this amount below the setpoint for the Anti-No-Flow to
disengage and return to normal PI operation.
0.0 ~
100.0 psi
3.0 psi Programming
 Denotes that parameter can be changed when the drive is running.
Monitor
No.
Addr.
Hex
Monitor Name
Digital Operator Display
Description
U1-99 72D
Anti-No-Flow Timer
ANF Timer
When this value reaches the P2-24 setting, the Anti-No-Flow feature begins to reduce the output frequency.
PI
Feedback
Output
Frequency
P2-24
ANF Det Time
PI
Setpoint
Drive
(re)Start
P2-02
Sleep Level
ANF Release Lvl
P2-25
Start Level
P2-24
ANF Det Time
P2-03
Sleep Tm.
Min Speed or
Thrust Speed
Feedback above
setpoint
Feedback drops below P2-25 ANF Release Level.
Anti-no-flow dis-engages, normal operation resumes
Anti-No-Flow – Leaks / Very Low Flow