Electrical Connection; Connection Of 1 Ph-Motors; Connection Of 3 Ph-Motors; Temperature Sensors - Homa TCM Series Installation And Operation Instruction Manual

6. Electrical Connection

Before operation, an expert check must secure that
the required electrical protection measures exist. The
connection to ground, earthing, isolating transformer, fault
current breaker or fault voltags circuit must correspond to
the guidelines set forth by the responsible power plant.
The voltage required in the technical data sheet
must correspond to the existing line voltage.
Submersible pumps used outside of buildings must
have a cable with a minimum length of 10m.
Make sure that the electrical pin-and-socket connec-
tions are installed flood- and moisture-safe. Before start-
ing operation check the cable and the plug against dam-
ages.
The end of the pump power supply cable must not be
submerged in order to prevent water from penetrating
through the cable into the motor.
The normal separate motor starter/control box of
standard as well as explosion proof pumps must
not be installed in explosive enviroments.

6.1. Connection of 1 Ph-Motors

TCV and TCM pumps are supplied with a plug and a ca-
pacitor which is integrated in the pump. If any other then
an original control unit is used, make sure that the ther-
mal relay in the motor starter is set according to the
nominal current consumption of the pump motor (see
data
on pump label).

6.2. Connection of 3 Ph-Motors

TCV and TCM pumps with 3Ph-motors are supplied with
or must be connected to a separate control box with mo-
tor starter and operating capacitor, available from the
HOMA accessory program. If any other than an original
control unit is used, make sure that the thermal relay in
the motor starter is set according to the nominal current
consumption of the pump motor (see data on pump
label).
Motor-Start
The motors of pump types TCV and TCM are designed
for direct-on-line (DOL) start. All motors with 400 V volt-
age indication on the pump label have their motor wind-
ings internally star-connected for operation at 400 V / 3Ph
power supply. The motor cable wires indicated U, V. W
must be connected to the power supply wires indicated
L , L , L through the motor starter according to page.
1 2 3

6.3. Temperature Sensors

Standard models of 1Ph-motors have the sensors (built in
upon request) internally connected, so that no external
connection to the control box is necessary. When the mo-
tor cools, it is switched on again automatically. The
switch-off temperature of the sensors is approx. 130°C.

6.4. Check of Direction of Rotation

1 Ph-pumps do not require any check, as they always run
with the correct direction of rotation.
3 Ph-pumps must be checked for correct di-
rection of rotation before start-up. On original
HOMA control boxes a control-light is illumi-
nated, if the direction of rotation is not cor-
rect.
With smaller pumps the direction of rotation
may be checked by watching the start-jek.
Put the pump vertical on the ground and lift
one edge. Start the motor. Viewed from
above, the unit must jerk anti-clockwise as
the correct direction of rotation is clockwise.
With bigger pumps the check may also be
done by watching the rotation of the impeller
through the discharge or the suction inlet.
With pumps already installed, the check may
be done by comparing head (pump pressure)
and flow (quantity of water) at different direction of rota-
tion. The direction that gives higher head and flow is the
correct one.
If the direction of rotation is wrong, interchange two of the
phases of the electric power supply. Using an original
HOMA control box with CEE-plug, this may be done by a
180° turning of the small round pole-socket at the plug-
end with a screwdriver.

7. Installation

Pay attention to the maximum depth of immersion
(see pump label).
If the pump is installed in a sump, the sump opening
must be covered with a tread-safe cover after installation.
The operator has to prevent damage through the
flooding of rooms caused by defects of the pump through
the use of appropriate measures (e.g. installation of alarm
units, backup pump or like that).

7.1. Submerged Base Stand Installation

Fix a 90° elbow to the pump discharge. The pump may be
installed with a flexible discharge hose or a rigid pipe,
non-return valve and isolating valve. If a flexible hose is
used, make sure that it does not buckle. Fix a rope or a
chain to the pump handle and lower the pump into the
liquid. If the pump is installed on muddy ground, support it
on bricks to prevent it from sinking in.

7.2. Submerged Installation with auto-coupling

Permanent installation of the pumps can be done on a
stationary auto-coupling. The following instructions refer
to the use of the original HOMA system.
⇒ Place the auto-coupling base unit on the bottom of the
pit. Use a plumb line to fix the correct position of the
guide rail bracket on the inside of the pit cover. Drill
mounting holes and fasten the guide rail bracket provi-
sionally with 2 screws.
⇒ Put the auto-coupling base unit in the exact position and
fasten with expansion bolts to the pit bottom. If the bot-
tom is uneven, the base unit must be supported to be in
horizontal position.
⇒ Assemble the discharge line in accordance with the
generally accepted procedures and without exposing the
line to distortion or tension.
⇒ Insert the guide rails in the ring of the auto-coupling
base and adjust the length of the rails by cutting them
accurately to the guide rail bracket.
⇒ Unscrew the provisionally fastenend guide rail bracket,
fit it on top of the guide rails and fasten it to the pit
cover. Make sure that the guide rails do not have any
axial play, as this would cause noise during pump op-
eration.
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