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The pump may be transported and stored in vertical or
horizontal position. Make sure that it cannot roll or fall over.
For longer periods of storage, the pump should be protec-
ted against moisture, frost or heat.
6. Electrical Connection
Before operation, an expert check must secure that the
required electrical protection measures exist. The connec-
tion to ground, earthing, isolating transformer, fault current
breaker or fault voltags circuit must correspond to the gui-
delines 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 connecti-
ons are installed flood- and moisture-safe. Before starting
operation check the cable and the plug against damages.
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 stan-
dard as well as of explosion proof pumps must
not be installed in explosive enviroments.
6.1. Connection of 3 Ph-Motors
Pumps with 3 Ph-motors must be connected to a separate
control box with motor starter, available from the HOMA ac-
cessory program. If any other control unit is used, make su-
re 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 pump motors are designed either for DOL- or Star-
delta-start (check the designation on the pump label).
Standard motors up to 4 kW are designed for direct-on-line
(DOL) start. All motors with 400 V voltage indication on the
pump label have their motor windings internally star-
connected for operation at 400 V / 3 Ph power supply. The
motor cable wires indicated U, V, W must be connected to
the power supply wires indicated L
tor starter according to fig. 1.
Standard motors above 4 kW are prepared for star-delta
start. This means that each end of each of the stator win-
dings is connected to one pump cable wire. The wires are
marked U
/U
, V
/V
and W
1
2
1
2
pump must be connected to an appropriate starter box (see
fig. 2 and 3).
If a motor, wich is prepared for star-delta start as described
above, is supposed to operate with direct-on-line (DOL)
start at 400V/3Ph power supply, the pump cable wires must
be delta-connected in the starter box (see fig. 4).
6.2. Temperature Sensors
All A series pumps have a set of temperature sensors built
in the stator windings. The contact of these sensors opens
in case of overtemperature and switches off the
motor power supply.
Standard models have the sensors connected to the motor
power supply cable, the wire ends marked T
must be connected to the safety circuit of the control box in
, L
, L
through the mo-
1
2
3
/W
. For star-delta start, the
1
2
and T
1
3
order to provide an automatic re-start of the motor, when
the motor cools. The switch-off temperature
of the sensors for standard models is approx. 130°C.
Explosion proof models have a set of temperature sensors
built-in additionally to the standard sensor as described
above, with a higher switch-off temperature of
approx. 140°C, connected to the motor cable, the wire
ends marked T
Ex-sensors must be connected to a special relay in the
starter box in order to provide manual pump re-start (see
fig. 1 and 2).
6.3. Oil Chamber Seal Condition Sensors
Upon request, A series pumps are available with a
moisture sensor device of the pump oil-chamber.
It measures the electrical resistance of the oil in the cham-
ber. In case of water entering the chamber through
the shaft seals, the resistance will change.
The standard models have one sensor, that measures the
resistance against ground (motor housing). The sensor is
connected to the pump cable, the wire end is marked S
(see fig. 1and 2).
The explosion-proof models have two sensors between
which the resistance is measured. The sensors are con-
nected to the pump cable, the wire ends are marked S
and S2 (see fig. 1 and 2).
The sensor(s) must be connected to a tripping unit, which is
connected to the safety circuit of the pump controller. For
explosion-proof models there has to be an intrinsically-safe
relay. The tripping unit should have an adjustable
sensitivity of 0 - 100 kΩ, standard setting is approx. 50 kΩ.
6.4. Check of Direction of Rotation
3 Ph-pumps must be checked for correct direction of rotati-
on before start-up. On original HOMA control boxes a con-
trol-light is illuminated, if the direction of rotation is not cor-
rect.
With smaller pumps the direction of rotation may be chek-
ked by watching the start-jek. Put the pump vertical on the
ground and lift one edge. Start the motor. Viewed from abo-
ve, 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 al-
ready installed, the check may be done by comparing head
(pump pressure) and flow (quantity of water) at different di-
rection of rotation. 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 HO-
MA 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.
. They
11
and T
.
1
2
1
1
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