228 YASKAWA TM.iQp.07 iQpump Controller Programming Manual
sleep based upon the standard sleep settings, controlled by parameters P2-01 and P2-02. If the drive goes to sleep due to P2-01 and P2-02,
a sleep boost will be performed.
When the level control is enabled (P8-01 = 1), the drive will only wake up (or start) once the water level goes above the wake-up level
(P8-05) AND the standard sleep function calls for a wake-up (set by parameters P1-04 and P1-05.
Low Level Detection
Independent of the pressure and level control is a low level detection feature. This feature is active all of the time, when running, when
not running, and in “Hand” mode. If the level in the well drops below the Low Level Detection Level (P8-07), for more than the Low
Level Detection Delay Time (P8-08), the drive will respond according to the Low Level Behavior (P8-09) parameter. The Low Water
Level digital output (H2-0x = 57) will activate anytime the level in the well drops below the Low Level Detection Level (P8-07), for more
than the Low Level Detection Delay Time (P8-08), or the drive is faulted on a LOWWL - Low Water Level fault.
Figure 1.171
Figure 175. Simple Block Diagram of Pressure & Level Control
Figure 1.172
Figure 176. Constant Pressure with Well Draw Down Control - Regulate Water Level (reduced flow & pressure)
+
-
Pressure
Control
PI
Pressure Setpoint
(d1-01 ~ d1-04)
Pressure Feedback
Terminal A2
+
-
Level
Control
PI
Water Level Setpoint
(P8-03)
Water Level Feedback
Terminal A1
Reference
Selection
Logic
Level Control
Min Speed
P8-06
Min Pump Freq
P1-06
or
Thrust Freq
P4-05
Frequency
Reference
Parameters
b5-02 ~ b5-10
Parameters
P8-10 ~ P8-11
Water Level
Term A1
(U 1-98)
Pressure Feedback
Term A2
(U 1-91)
Output Frequency
(U1-02)
Level C ontrol M in Speed
W ake - Up Level
Level C ontrol Setpoint
Level C ontrol M in Level
Pressure Setpoint
Sleep D elay Tim e
Start Delay Tim e
1 2
3
4 1
1 Pressure Control – Enough water in well to maintain pressure & flow.
2 Level Control – Not enough water in well, pressure & flow decrease below setpoint to maintain level in well.
3 Not Enough Water – Level Control Min. Speed (P8-06) draws water down below P8-04 level, drive goes to sleep.
4 Drive Sleeping – Waiting for well to recharge and level to go above Wake-Up Level (P8-05).
Wake Up Level (P8-05) > Level Control Setpoint (P8-03) > Level Control Minimum Level (P8-04)
P8-05
P8-03
P8-04
P2-03
P1-05
P8-06
d1-0x
(522 pages)
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