- 8 -
5
Installation
1. Confirmation before installation
Measurement of insulation resistance
Measure the insulation resistance between the ground and the grounding wire and between
phases using a megger in a state that the motor and the cables (excluding the power source
connection section) are immersed in water. If the insulation resistance at the respective sections
is 20M
Ω or more, there is no problem. During the measurement, keep the power source
connection section of cables distant from the ground.
2. Installation
Warning
On handling and installation work of the pump, assure safety by confirming the
mass and the shape of the pump referring to the appearance this instruction
manual, drawing, the catalogue, and other materials. There are dangers of
dropping the pump and the injury of worker.
Never execute the operation of the pump and the mounting work of parts in a
lifted position. That type of work is dangerous causing dropping the pump and
injury of workers.
Do not damage, break, machine, forcefully bend, stretch, or twist the power
cable, bind the power cable into a bundle, or place a heavy load on the power
cable. Those kinds of handling cause fire and electric shock
The handling and installation work of the pump shall be done only by a
qualified technician in accordance with the applicable legal standards. Unless
follow the rule, the work becomes illegal and there is a possibility of inducing
accident such as fire and injury.
Note
Apply repair painting at an interval depending on the use environment. Depending on the
use environment, there may be generated rust at threaded sections, machined sections
with rust-proof coating, rust-proofing sections, etc.
1)
On transporting and installing the pump, never apply tension to the cables. Those works shall be
done by attaching chain or rope to the handle.
2)
The pump cannot be operated in horizontal position and in lifted position. Operate the pump at
vertical position on a base.
3)
Install the pump at a place of free from turbulence in the tank, as far as possible. For a pump
equipped with a float, select the place of installation of the pump so as to avoid direct hitting of the
flowing-down liquid to protect the float.
4)
If there is a flow in the tank, support the pipe at an adequate position, (refer to Fig. 2).
5)
Avoid the generation of air-pocket in the pipe.
6)
Do not immerse the discharge end of the pipe in water. Immersed end of the pipe induces
backflow on stopping the operation of the pump.
7)
Apply a sewage check valve to every pump.
8)
Since non-Automatic type pump (Model DL) has no Automatic operation device which is actuated
by a float in the pump, care shall be given to the pump operating water level. If that type of pump
is operated continuously for 10 minutes or longer period at near the operable minimum water level,
the Auto-cut in the motor is actuated. Therefore, the Automatic operation device shall be installed
as illustrated in Fig. 3, and the stop-operation water level shall be set at a position higher than the
operable minimum water level to avoid dry operation. The operation-start water level shall be set
to a position higher than the level of fully immersing the pump.