Tsurumi PU Submersible Vortex Sewage Pump - Manual (Page 14)

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U V W G
V
U V G W
COUNTERMEASURE
If the power supply voltage deviates from the tolerance value, the cause of the deviation may be the capacity
of the power supply or the extension cable that is used. Refer to section "5. Electrical Wiring" to operate the
pump in the correct manner.
COUNTERMEASURE
Because an overload condition may be present at the pump motor if the operating current exceeds the rated
current, follow the instructions in section "4. Installation" to operate the pump in the correct manner.
(3) Connect the pump to the pipe and submerge it in water.
(4) Operate the pump for a short time (3 to 10 minutes) and perform the following checks:
Using an AC ammeter (clamp), measure the operating current at
the phases U, V, and W that are connected to the terminal board.
Using an AC voltmeter (tester), measure the voltage at the terminal
board.
Power supply voltage variation
= within ±10 % of the rated voltage
CAUTION In case the pump exhibits an abnormal condition (such as a considerable
amount of vibration, noise, or smell), disconnect the power supply
immediately and contact the dealer where you purchased the equipment, or
Tsurumi's sales office in your area. If the pump continues to be used in the
abnormal state, it may cause current leakage, electrical shock, or fire.
(5) Proceed with the normal operation if no abnormal conditions are found during the trial
operation.
Operation
WARNING The pump unit may be extremely hot during operation. To prevent burns, do
not touch the pump unit with bare hands during or after the operation.
Pay attention to the water level during the pump operation. The pump will become dam-
aged if it is allowed to operate dry.
Due to an overload operation or a pump malfunction, if the motor protector trips to stop
the pump, make sure to eliminate the cause of the problem before restarting.
A frequent ON/OFF will shorten the lifetime of the pump.
To operate a submersible pump (including automatic operation), set the water level so that
the pump will operate about 10 times per hour.
However, as for free-standing type of the 1.5kW model, set the operating condition of the
pump so that it may run for less than 12 hours per day and 4000 hours per year. The start-
ing reaction of the pump may let the pump rotate to the direction of screwing the discharge
pipe, which could cause damage to the screw flange of the pump. If frequent starts are ex-
pected in your installation, prevent the pump from rotating by fixing it to the pipe or other
method.
Note:
A large amount of amperage flows when a submergible pump is started, causing the tem-
perature of its windings to rise rapidly. Beware that a frequent stop-and-go operation of
the pump will accelerate the deterioration of the insulation of the motor windings and thus
affect the use life of the motor.
Operating Water Level
CAUTION Do not operate the pump at the levels below the C.W.L. longer than 15
minutes, as it could damage the pump, causing current leakage and electrical
shock (30 minutes maximum on the models with 0.15kW power output). For
details on the lowest water level, refer to the dimension drawing, which is
provided separately.