Model
OM4A
INSTALLATION MANUAL
17
NO START
POWER
INPUT
TOO HIGH
NO STOP
GROUNDED
MOTOR
FREQUENT
STARTS AND
STOPS
RUNS
SLOWLY
No power supply
Supply voltage too low
Disconnected or
damaged cable
Excessive starting
voltage drop
Fuses burnt
Switch / Thermal activated
Supplied with 2 phases
(three-phase motor)
Supplied with 2 phases
instead of 3 (three-phase motor)
Defective motor winding
Wrong capacitor
Wrong voltage
Overload
Leaks in plant
To high power
absorption
To high liquid
temperature
Oversized pump
Damage to the level probe
Wrong winding connections
(three-phase motor)
Run and start windings
exchanged on control panel
(single-phase motor)
Damaged axial bearing
Incorrect capacitor
(single-phase motor)
Level probe turned off (if available)
Operating level too deep
Rotor/Pump locked
Faulty
stator
Overload
Lightning
discharge or
over voltage
Overheating
Grounded
supply cable
Grounded connection
O´ring outseat or cut
Water leaks
From diaphragm
Leaks in plant
Level probe
defected
Liquid temperature
too high
Too many startings
per hour
Damage thrust bearing
Incorrect pump
Defective pump
From supply cable
CAUSES OF FAILURE OR DEFECTS
