Yaskawa iQpump Controller User Manual - Manual (Page 244)

244 YASKAWA TM.iQp.06 iQpump Controller User Manual
G.3 Well Draw Down Function
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10. Set Wake-Up Level in Parameter P8-05
When the water level reaches the Wake-Up Water Level and the on delay timer set in P1-05 expires the drive will automatically begin
running again. The Wake-Up Water Level should be greater than the P8-03 (Maintain Level) setting so the drive will automatically go to
pressure regulation mode.
Note: Delay time is set in parameter P1-05.
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11. Set the Minimum Pump Speed in Level Control in Parameter P8-06
Set the Level Control Minimum Speed should to a level that ensures the pump is moving water out of the well. If it is set to a speed that
does not allow water to move, the proportional integral regulator may not drive the well level to sleep, causing damage to the pump or
motor. The Minimum Pump Speed is only used in Level Control Mode; the actual minimum speed in Level Mode will be the greater of
the values in P1-06, P4-05, and P8-06. If P8-06 is set higher than P1-06 and P4-05, it will only be used while the iQpump drive is in level
control mode.
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12. Set Low Level Detection Value in Parameter P8-07 and Program the iQpump Drive Response in
Parameter P8-09
The Low Level Detection is the level at which the pump is in danger of dry running. Generally this level is a fail safe level and it is
desirable to fault the iQpump drive and stop running immediately if the water reaches this level. Low Level Detection can also activate
the iQpump fault contacts, which can be used for auxiliary notifications. In P8-09 the iQpump drive can be programmed for one of three
responses; No Display, Alarm Only or Fault. Factory default is Alarm Only.
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13. Verify Settings and Well Level in Monitor U1-98
The well level can be displayed and observed when the pump is not running by using monitor U1-98, and pressing the Auto button will
start the iQpump drive in pressure regulation mode assuming all other parameters for pressure regulation have previously been set-up.
Check U1-98 when the setpoint pressure has been reached and note the level. Depending on the recharge rate of the well, this value will
be lower than the level without the pump running.
U1-98 will also indicate if the well recharge rate is at current demand and if the other levels are set appropriately. Check U1-98
periodically over the season of operation to check level variations related to the different times of the year.