Sun Pumps MTR BLM-SB-073S-60 - Manual (Page 16)

LPLW Adjustment
The Low Water Cut-Off Circuit and the Low Power Shut-Down circuit are adjusted using
the same trim pot labeled “LP Adj.” on the controller. The default is the arrow pointing
straight up. This is sufficient for most systems but adjustment will maximize the life and
output of your system. Follow the steps below to adjust this feature.
1. Turn the “LP Adj.” trim pot fully counter clockwise.
2. Turn the “Speed Control” trim pot counter clockwise until the pump is pumping
the desired minimum flow. This may be down to 0 gal/min but is not
recommended for proper pump cooling.
3. Turn the “LP Adj.” trim pot clockwise until the pump shuts off.
4. Reset the “Speed Control” trim pot back to the desired position.
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.
Motor Speed Control 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 a10- turn range. It usually takes many complete turns in a
counter-clockwise direction before you will notice any change in water output or
motor speed).
4.0 Troubleshooting
Sun Pumps, Inc. is dedicated to its customers and will gladly help you trouble shoot any
problems with your system. However, especially during the busy summer pumping
season, we may not be able to help you right away. Using this trouble shooting guide as
your first resource when your system is not working properly can save you valuable time
in getting your system fully functional. If at any time however, you are not comfortable