Sumoto OP4 Serie Manual De Instalación página 9

CAUSES OF FAILURES OR MALFUNCTIONS
NO START
- No power supply
- Supply voltage too low
- Cable unplugged or damaged
- Excessive starting voltage drop
- Fuses burnt
- Circuit breaker not calibrated
- Supplied with 2 phases (three-phase mot.)
- Uncorrect capacitor (single phase mot.)
- Activation of level probe
- Operating level too deep
- Blocked impeller
- Faulty stator:
· Overload
· Lightning discharge or overvoltage
· Overheating
GROUNDED MOTOR
- Grounded supply cable or jack
- Grounded connection
- O-ring outseat or cut
- Water leaks
· from diaphragm
· from supply cable
RUNS SLOWLY
-
Run and start windings exchanged on ctrl panel
(single phase mot.)
-
Wrong winding connections (three-phase mot.)
FREQUENT STARTS AND STOPS
- Damaged pressure switch or level probe
- Oversized pump
- Too high liquid temperature
- Too high power absorption
- Leaks in plant
POWER INPUT TOO HIGH
- Wrong voltage
- Wrong capacitor
- Defected winding
- Supplied with 2 phases instead of 3 (three-pha-
se mot.)
- Overload
· Wrong pump size
· Faulty pump
· Damaged thrust bearing
· Too high liquid temperature
· Too many startings per hour
NO STOP
- Level probe defected
- Leaks in plant
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