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EBARA Submersible Sewage Pumps
DL3FU / DL3MFU / DL3KFU / DL3KMFU / DDL3FU / DV3FU/ DML3FU
Operating, Installation, and Maintenance
INSTRUCTION MANUAL
3.1.3
Other Checks Requiring Particular Attention
(1) Minimum operating water level:
Be sure that the pump stop level is not lower than the minimum operating water level
specified in the technical document found on the EBARA website. If the stop level is
lower, a vortex flow can occur causing the pump to intake air, resulting in noise and
vibration.
If there is possibility that the minimum water level may decrease to an excessive extent,
it is necessary to use a minimum water level alarm. An alternative measure would be
a water level-dependent control system that turns the motor off automatically. It will
stop the pump when the water level is lowered than the critical level and is turned on
again to resume automatic operation when water is restored to a safe level.
(2) Pump location relative to pump pit water inlet:
If the pump is installed near the pump pit water inlet, the incoming flow to the pump
can be considerably turbulent; the influent liquid can shake the pump and cause the
cable(s) to be whipped vigorously, resulting in damage. Therefore, the pump should
be located as far from the water inlet as possible or an influent baffle should be installed.
(3) Size of debris:
Entry of large or long debris can result in a blocked impeller.
If such problem occurs, the pump can be readily lifted out and disassembled for
servicing, which is however, time and labor consuming.
The primary consideration therefore should be to prevent the ingress of any oversized
objects into the sump by use of a screen, etc. Another important consideration is to
minimize presence of abrasive substances, such as sand, in the liquid.
If the contents of such substances become high, the impeller is increasingly worn,
leading to the degradation of capacity.
Note : In case of any problems listed above actually occur, contact EBARA immediately.
EBARA
PM32U
PUMPS AMERICAS CORPORATION
www.pumpsebara.com
(t) 803.327.5005 (f) 803.327.5097
Motor Cable
L1
L2
L3
G
P1
P2
P3
P4
Fig. 5
Winding Coil
Thermal Detector
Leakage Detector
P.7
8
rev. 01/21
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