Troubleshooting - Pentair Pentek Series Electronic Manual

SECTION 7: Hitachi

7.11 Troubleshooting

Problem
Motor does not start but does not
blow fuses or relay
Fuses or relay blow when motor
starts
Motor runs for a while and then
blown fuses or relay.
46
6" and Larger Submersible Motors
®
Possible Causes
No power supply
Defective connections
Incorrect voltage
Incorrect fuses or relay
Defective capacitors
Wrong connections
Low voltage or high voltage
Defective capacitors
Different control box for the motor
Defective starting voltage relay
Pump is sand clogged
Overheated protector
Solution
Replace fuses, breakers or check for
loose or corroded connections and
motor lead terminals
Correct connections
Apply correct voltage. Voltage must
be plus or minus 10% of rated
(Nameplate)
Replace with proper fuses and relay
Replace with proper capacitors
Correct wrong connections or short
circuit.
Locked rotor conditions
Correct pump or well conditions
Insulation resistance down
Check the line and correct
Apply rated voltage
Replace with proper capacitors
Replace with proper control box
Replace with proper relay
Pull pump and clean well
Shield the control box from heat
source