Grundfos SP User Manual

31
English (US)
5. Fuses blow or
circuit
breakers trip.
a) The voltage is too high or low.
How to check:
Check the voltage at the pump
control panel. If not within ± 10 %,
check the cable size and length of
run to pump control panel.
If the cable size is correct, contact
the power company. If not, correct
and/or replace as necessary.
b) The three-phase current imbalance
is too high or low.
How to check:
Check the current draw on each
lead. The imbalance must be within ±
5 %.
If current imbalance is not within ±
5 %, contact the power supply
company.
c) The control box wiring and
components are incorrect or
defective (single-phase only).
How to check:
Check that the control box parts
match the parts list. Check to see
that the wiring matches the wiring
diagram. Check for loose or broken
wires or terminals.
Correct as required.
d) The capacitor is defective (single-
phase only).
How to check:
Turn off the power, then the
capacitor. Check by means of an
ohmmeter (Rx100K). When the
ohmmeter is connected, look for the
needle to jump forward and slowly
drift back.
If there is no ohmmeter needle
movement, replace the capacitor.
e) The starting relay is defective
(certain types of single-phase only).
How to check:
Check the resistance of the relay coil
by means of an ohmmeter
(Rx1000K). Check the contacts for
wear.
Replace any defective starting
relay.
Problem Possible cause and/or how to check Possible remedy

Grundfos SP Specifications

General

Material	Stainless Steel
Pump Type	Submersible
Application	Irrigation
Motor Range	0.37 kW to 4 kW
Liquid Temperature	0 °C to 40 °C
Series	SP
Power Range	0.37 kW to 4 kW
Frequency	50 Hz, 60 Hz
Head	Up to 200 m
Discharge Size	1 inch to 4 inches