© 2018 Littelfuse Fresh Water Pumping
13
Submersible Pumps – Optimized Protection
Littelfuse.com/Pump-Protection
ABBREVIATED INSTALLATION INSTRUCTIONS
Operation
The Littelfuse Pump Protection units monitor pump loads
in amps and kilowatts. When the current (amps) exceeds
approximately 125% of calibrated current, or power (kW) drops
below the adjustable underload trip point, the units—after the
trip delay—will turn off the pump. The units will automatically
restart the pump after the selected restart delay time (unless in
the manual reset mode).
The calibration is stored in permanent memory. The units do not
need to be re-calibrated if power is lost.
Sensitivity
The Littelfuse Pump Protection units have an adjustment knob
to set the underload trip sensitivity. Setting SENSITIVITY to the
middle position (straight up) is equivalent to Littelfuse’s standard
underload trip level. Adjust the SENSITIVITY knob to increase/
decrease underload sensitivity up to approximately ±10% of the
standard trip. It may be necessary to increase the sensitivity if
the unit does not trip on dry-run or dead-head or it is known
that the water level in the well is very low relative to the
pump’s capabilities.
WARNING: Decreasing the SENSITIVITY may
compromise the unit’s ability to detect dry-run and/or
dead-head conditions.
Run Hours
The Littelfuse Pump Protection units record pump run hours.
Run hours can be displayed by a Littelfuse Informer. Run hours
can be reset on the units. Please read the instructions fully
before performing the procedure.
Note:
Turn the SENSITIVITY knob
completely
to the left
(counter-clockwise) or
completely
to the right (clockwise)
when directed.
WARNING: Ensure power is applied to the INSIDER models
in a safe manner when performing the following procedure.
To Reset Run Hours:
1. Remove power to the units.
2. Set the RESTART DELAY/CALIBRATION knob to RESET and
the SENSITIVITY knob to the middle (12:00) position.
3. Apply power to the unit—the CAL LIGHT will turn on.
4. Turn the SENSITIVITY knob to the right—the CAL LIGHT will
turn off and the RUN LIGHT will turn on.
5. Turn the SENSITIVITY knob to the left—both lights will
turn on.
6. Turn the SENSITIVITY knob to the right.
7. After 10 seconds, the CAL and RUN LIGHTS will blink twice
indicating the run hours have successfully been reset.
Mounting (111P/233P/235P only)
Use in conjunction with UL listed or recognized thermal or
solid-state overload relays only.
1. Mount the Model 111P/233P/235P in a convenient location in
or near the pump control box. If the location is wet or dusty, a
NEMA 3R, 4 or 12 enclosure should be used.
Calibration/Restart Delay
Note:
All models should be calibrated during normal pumping
conditions. There must be a “call for water”; ensure the
pressure or float switch is fully closed.
INSIDER Models
1. Turn RESTART DELAY/CALIBRATION to the CAL position and
close the control box cover.
2. Apply power to the system. The pump should run for
approximately 10 seconds and then shut off—this indicates
the INSIDER has calibrated.
3. Remove power from the system. Open the control box and
set the appropriate dry-well recovery time with the RESTART
DELAY/CALIBRATION knob.
4. Shut the control box and re-apply power to the system.
111P/233P/235P Models
1. Turn the RESTART DELAY/CALIBRATION knob fully counter-
clockwise to the CAL position.
2. Apply power. The pump will run for approximately 10 seconds
then shut off.
3. Set the RESTART DELAY/CALIBRATION knob to the desired
restart delay (dry-well recovery time). The pump will turn on.
Note:
If the Model 235P immediately trips out upon completion
of the calibration process, the current transformer may be
installed incorrectly. Switch the CT1 and CT2 connections at the
unit, then repeat the calibration process.
Calibrating While Pumping
The 111P/233P/235P can also be calibrated while the pump is
running. Turn the RESTART DELAY/CALIBRATION knob to CAL
while pumping. Wait for the pump to turn off (approximately 10
seconds), then adjust the RESTART DELAY/CALIBRATION knob
to the desired restart delay setting.
Manual Reset Mode (111P/233P/235P only)
Set the RESTART DELAY/CALIBRATION knob to RESET for
manual reset mode. If the 111P/233P/235P trips off due to a
voltage or load problem, the RESTART DELAY/CALIBRATION
knob must be rotated out of the RESET position to restart the
pump, and then can be placed back in the RESET position for
subsequent manual reset mode.
Note:
Any restart delay can be bypassed by rotating the
RESTART DELAY/CALIBRATION knob to the RESET position
and back to the desired restart delay setting.
Note:
The restart delay can be changed at any time. The next
trip will follow the new restart delay setting.
