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Output Power Limit Circuit (Motor Speed Control)  

 
The Output Power Limit Control circuit is used to control the speed of the pump motor and thus the flow 
rate  of  the  pump.  It  is  primarily  used  for  low  producing  wells  where  the  pump  output  is  matched  to  the 
production rate of the well. However it can also be used any time specific flow rates are required. 

 

 

Output Power Limit Adjustment

 

The purpose of this procedure is to adjust the output power of the controller and thus reduce the water flow 
of the pump.  If tests have shown the pump will out produce the well capacity, then the controller “Speed 
Control” feature can be used to match the flow rate of the pump to the production of the well.  
 
1.

 

With  the  system  installed  and  controller  properly  configured,  allow  the  pump  to  run  at  full  power  at 
mid-day until the pump starts surging. 

 
2.

 

Slowly turn the “Speed Control” trim pot located on the face of the controller counter clockwise until 
the pump stops surging. This  is the point  where the pump  flow rate  equals the  well production. This 
process  will probably take  a  few attempts to “balance”  the system for optimum  water production. If 
maximum water is not a critical issue you may want to reduce the pumps flow rate an additional 5% to 
10% to insure the pump will not run dry.  

 

(NOTE: The trim pot has a15- turn range. It may take multiple complete turns in a counter-clockwise 
direction  before  you  will  notice  any  change  in  water  output  or  output  power  on  the  display). 

Summary of Contents for SCP series

Page 1: ......

Page 2: ...ring 3 5 Figure 2 Control Panel Figure 3 Dip Switch Settings Controller Settings 3 6 Auxiliary Control Circuits 3 7 Remote Switch Output Power Limit Circuit Low Power Shut Down Circuit Low Water Shut...

Page 3: ...es controller or product damage and or personal injury may result Do not exceed the voltage rating of the controller Do not splash water on the controller especially when the cover is open Mount the c...

Page 4: ...rless DC motors No other applications or DC power sources are recommended or warranted unless written approval is provided by the SunPumps factory 3 0 Installation and Operation The following sections...

Page 5: ...he solar modules as specified by the National Electric Code Wire sized too small will cause a decreased output from the pump Keep the distance from the solar modules to the pump as short as possible R...

Page 6: ...valves are open and strainer pot temperature is cool to the touch then with extreme caution you can open the strainer lid Do not open the strainer pot lid while the pump in in operation Strainer Clea...

Page 7: ...ble or call your SunPumps dealer for assistance Wire gauge being too small will cause excessive voltage losses to the motor and will reduce the flow rate of the pump All other system equipment should...

Page 8: ...Figure 2 Controller Wiring Diagram...

Page 9: ...9 Connect the DC source supply positive the red conductor to one of the controller terminals labeled Positive on the Solar Array Input NOTE The power should be connected to a disconnect and it should...

Page 10: ...ic Turns pump off when terminals connect OFF 2 ON Low Water Cutoff Logic Turns pump on when terminals connect OFF 3 ON 10 Minute Delay Increases turn on delay to 10 minutes OFF 4 ON 30 Minute Delay In...

Page 11: ...tor speed control is for adjusting the flow rate of the pump There is also the low water cutoff low power shut down and over current protection circuits See each corresponding detailed description bel...

Page 12: ...troller program This timeout applies to remote switch and low water cutoff Low Power Shut Down Sensorless Low Water Cut Off Circuit LPLW The Low Power Shut Down Low Water Cut Off Circuit LPLW turns th...

Page 13: ...atch the flow rate of the pump to the production of the well 1 With the system installed and controller properly configured allow the pump to run at full power at mid day until the pump starts surging...

Page 14: ...lay Screens NOTE Dip switch 7 will freeze the display on the current screen If the system is powered up with switch 7 on the display will only show the SUNPUMPS INC screen Turn off switch 7 to unfreez...

Page 15: ...ote circuit or low water cutoff circuit is preventing the controller from running the pump Set the 1 and 2 dip switches to off and disconnect the remote switch and low water cutoff If the pump starts...

Page 16: ...complete series string PUMP IS RUNNING BUT THE OUTPUT IS LOW 1 Make sure you have full sun light at midday that there are no clouds and no shadows on any part of the array Then verify power coming ou...

Page 17: ...heet is a must Pump Model Number ____________________ Pump Serial Number ____________________ Motor Serial Number ____________________ Controller Model Number ____________________ Software Version ___...

Page 18: ...s or other loss or injury resulting from the use of a SunPumps product The purchaser s exclusive remedy shall be only as stated herein This warranty is in lieu of all other warranties expressed or imp...

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