Sun Pumps PCC-48BLS-M2 - Manual (Page 11)

Sensor Low Water Cutoff Circuit
The sensor type low water cutoff circuit is designed as a safety feature to protect your pump from running dry or
your tank from over flowing. This feature is designed for use in the submersible SCS systems with the ground wire
installed. For use with the SCB or SCP systems contact SunPumps for assistance. The “LW” terminal of the
controller should be attached to a low water sensor electrode which is mounted in your tank or well. The system can
be used to detect low water or to detect high water depending on the position of switch 2 on the dip switch. When
dip switch 2 is in the off position, the low water cutoff circuit expects not to touch water. If water comes into
contact with it, and completes the circuit to ground, the pump will shut off until the water is removed and the delay
timer times out. A one minute timeout is included in this feature.
Remote Switch
The Remote Switch interface can serve as an automatic system shutdown when used with a water storage tank
mounted float switch, a pressure switch or it can also serve as a manual system shutdown with a remote system
ON/OFF toggle switch. The remote logic circuit allows the use of standard “Pump-Up or Pump Down” float
switches. Please refer to the following operation scenarios for configuration options.
With switch number 1 in the OFF position, the controller is configured to accommodate a Normally Open (N.O.)
float switch or remote toggle switch. In this configuration the controller will operate as follows:
PUMP ON
float switch open = water tank low = pump ON
PUMP OFF
float switch closed = water tank high = pump OFF
With switch number 1 in the ON position, the controller is configured to accommodate a Normally Closed (N.C.)
float switch, pressure switch or remote toggle switch. In this configuration the controller will operate as follows:
PUMP ON
float switch closed = water tank low = pump ON
PUMP OFF
float switch open = water tank high = pump OFF
The remote switch feature does not have a time out since many of these units are used for pressure systems. The
pump should immediately begin running when the remote switch is turned to “On”.
Input Voltage Threshold Adjustments
The Input Voltage Threshold Adjustment is available to help accommodate for differences in battery banks, systems
with other power draws (such as inverters or other pumps), or systems which are not able to be located near the
battery bank. The Input Voltage Threshold Adjustment will modify the Minimum Start Voltage, the Minimum Run
Voltage and the Dead Battery Shutdown Voltage. See Table 2 below.
Table 2
Minimum Start
Voltage Low Battery
Voltage Dead Battery
Shutdown
Both Dip Switches OFF 49 Volts 47 Volts 44 Volts
Dip Switch 3 ON 48 Volts 46 Volts 43 Volts
Dip Switch 4 ON 48 Volts 45 Volts 42 Volts