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EBARA Submersible Sewage Pumps
DL3FU / DL3MFU / DL3KFU / DL3KMFU / DDL3FU / DV3FU/ DML3FU
Operating, Installation, and Maintenance
INSTRUCTION MANUAL
5. Operation
5.1 Operational Limitations
This pump is designed to operate under the following conditions:
(1) Liquid temperature: max. 40ºC (105ºF）
(2) Liquid: This pump must not be used with sea water and corrosive chemicals or
combustible liquids.
(3) Lowest liquid level: Refer to lowest liquid level shown in the technical document.
(4) Voltage variations: The motor is designed to supply its rated output at variations of
up to ±10% of the rated voltage at the rated frequency.
(5) Frequency variations: The motor is designed to supply its rated output at variations
of up to ±5% of the rated frequency at the rated voltage.
(6) Combined variations: When the variation of voltage and frequency are combined,
the total variation is limited to a maximum of 10 percent (sum of absolute values) of
the rated values, provided the frequency variation does not exceed ±5% of rated
frequency.
5.2 Checking Rotation Direction (Figs. 12 and 13)
Check the motor for rotation direction by the following procedure after the pump has been
installed in the pump pit.
A reversing pump is no problem if operation is not prolonged.
(1) If the pump performance curve is available.
Open the sluice valve on the discharge side approximately half a turn (so that air is
released, and a small quantity of liquid is discharged), and turn the main switch ON.
With all air released from the discharge pipe, fully close the sluice valve.
At this time, if the value of shut-off Total Discharge Head meter (m)
where;
Total Discharge head = H1+H2 (m)
H1 (m)
H2 (m)
is generally in agreement with the pump performance at hand, the pump is operating
normally.
If the pump is reversed, a performance curve as denoted by dashed lines in Fig. 12 is
usually obtained, where the pump's discharge pressure is lower than normal or
specified, and a sudden rise in electric current occurs with gradual opening of sluice
valve.
In this event, change connections as shown in Fig. 13.
EBARA
PUMPS AMERICAS CORPORATION
PM32U
www.pumpsebara.com
(t) 803.327.5005 (f) 803.327.5097
Compound pressure gauge reading
Vertical distance from gauge to liquid surface
P.17
18
rev. 01/21
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