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Ebara Submersible Single Channel Sewage Pumps
Operating, Installation and Maintenance
Installation
continued)
e) Motor protection:
•
For 3HP motors, a built-in auto-cut is used and will be activated when motor becomes overheated due to
abnormal conditions such as locked rotor or single phasing. There is no external wiring for this feature.
•
For 5HP to 30HP motors, a normally closed built-in thermal protector is used. When motor winding becomes
over-heated, the circuit is opened, shutting the motor down and allowing it to cool. an external sensor cable
is provided for this feature and must be connected to a thermal relay in the control panel. Failure to do so
will void the warranty. Specifications for the thermal protector are listed below:
Contact rating:
Contact type:
Operation
1. after completing installation, measure the insulation resistance again, using the procedure described in the
"Installation" section.
2. Check to make sure there is an adequate amount of water in the wet well. Continuous operation of the pump in a
dry condition will cause the motor protector to be activated.
3. Check the direction of rotation by turning on pump. If the discharge volume is low or unusual sounds are heard, it is
likely that rotation has been reversed. If this happens, reverse two of the three power cable wires. (see Figure 4)
4. after confirming that the direction of rotation is correct, gradually open the discharge valve and allow the pump to run
in continuous operation. Check the voltage, current and discharge pressure to make sure they are within allowable limits.
5. If voltage, current and discharge pressure are acceptable, you may continue to operate the pump on a continuous
basis. Please refer to "Troubleshooting" section of the manual or contact your local Ebara distributor if one of these
items is outside of allowable limits.
6. Do not allow the motor to start more than 20 times per hour.
Ebara Fluid Handling
www.pumpsebara.com
(803) 327-5005 • (803) 327-5097 (fax)
aC 230V, 13a (Max)
break contact (normally closed)
Figure 4
DMLEU
8
rev. 01/13
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