EBARA 4WY Serie Manual De Instalación página 5

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ELECTRICAL INSTALLATION
• Electrical connection: check the colours on the motor rating plate and refer to the schemes
at the end of this manual if necessary.
• Fuses and overload protections are recommended in order to keep the motor safe. For
further information, please contact EPE Technical Department.
• An high sensitivity circuit breaker device is recommended.
• Single phase version: please use the control panel provided by Ebara or choose a panel
according to Ebara specification in order to let the motor work properly.
Motor has to be earthed according to local regulation
POWER CABLE
The cable has to be suitable for submersible applications.
Check the table at the end of this manual, it shows the maximum cable lengths (expressed
in m) as function of the cross section. These dimensions are valid for a tension drop of the
3 % at a room temperature of 30 °C.
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CAUSES OF FAILURES OR MALFUNCTIONS
NO START
- No power supply
- Supply voltage too low
- Cable unplugged or damaged
- Excessive starting voltage drop
- Fuses burnt
- Circuir breaker not calibrated
- Supplied with 2 phases (three-phase mot.)
- Thrust bearing stuck
- 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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