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2432-TU34 (/C)
Инструкция по эксплуатации Страница: 11

Homa 2432-TU34 (/C) [11/36] Electrical connection

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

protected against moisture, frost or heat.

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 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 sepa-

rate control box with motor starter, available from the

HOMA accessory program. If any other control unit is

used, make sure that the thermal relay in the motor

starter is set according to the nominal current consump-

tion 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 sup-

ply. The motor cable wires indicated U, V, W must be

connected to the power supply wires indicated L

, L

through the motor 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

windings is connected to one pump cable wire. The wires

are marked U

, V

and W

. For star-delta start,

the 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 de-

scribed 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

and T

They must be connected to the safety circuit of the control

box in 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 sen-

sors built-in additionally to the standard sensor as de-

scribed above, with a higher switch-off temperature of

approx. 140°C, connected to the motor cable, the wire

ends marked T

and 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

chamber. 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

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 intrinsi-

cally-safe relay. The tripping unit should have an adjust-

able 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 rota-

tion before start-up. On original HOMA control boxes a

control-light is illuminated, if the direction of rotation is not

correct.

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 cor-

rect 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 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

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.

Homa 2432-TU34 (/C) [11/36] Electrical connection

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