Sun Pumps MTR BLM-SB-073S-60 - Manual (Page 15)

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 three minute timeout is default for this
feature but is modifiable by switches 3 and 4 to 10 or 30 minutes respectively. This
timeout applies to remote switch and low water cutoff.
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
switch closed = water tank low = pump ON
PUMP OFF
switch open = water tank high = pump OFF
A one minute minimum timeout is default for this feature but is modifiable by switches 3
and 4 to 10 or 30 minutes respectively. At certain times the controller may be off for up
to 14 minutes depending on various factors in the controller 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 the pump off any
time the controller output power drops below a functional level. This may be caused by
lack of power from the solar panels or from running out of water. This protects the pump
in stall conditions and saves wear on the system when no or very little water is being
pumped. This feature must be adjusted for your specific application.
This feature is always monitoring the output of the motor. If you are not interested in
using this feature turn the “LP Adj” trim pot fully counter-clockwise. This will give the
pump the minimum low power set point possible.