Homa H 163 Series, Original Instruction Manual

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3.4. Explosive enviroments
For operation of the pumps in explosive enviroments
only models with explosion-proof motors (Ex model) must
be used.
For each individual installation the explosion classifi-
cation (Ex-class) of the pump must be approved by the
local authorities.
4. Warranty
Our warranty only covers pumps which are installed and
operated in accordance with these installation and opera-
tion instructions and accepted codes of good practice and
being used for the applications mentoined in these instruc-
tions.
5. Transport and Storage
Never use the cable or the discharge hose/pipe to lift,
lower, transport or attach the pump. Always use the han-
dle or a rope or a chain attached to the handle.
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 separate
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 ac-
cording to the nominal current consumption of the pump
motor (see data on pump label).
Motor-Start
The motors 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
1
/U
2
,
V
1
/V
2
and W
1
/W
2
. For star-delta start, the pump must be
connected to an appropriate starter box (see page 21).
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
page 21).
6.2. Temperature Sensors
All 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 mo-
tor power supply cable, the wire ends marked T1 and T3.
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 (see page
22, Fig. 1).
Explosion proof models H 163 Ex and H 165 Ex have a
set of temperature sensors built-in, with a higher switch-off
temperature of approx. 140°C, connected to the motor ca-
ble, the wire ends marked T1 and T2. They must be con-
nected to a special relay in the starter box in order to pro-
vide manual pump re-start (see page 22, Fig.2).
Explosion proof models H172 Ex to H179 Ex have both
sets of sensors built-in, as described above, with wire
ends marked T1, T2, T3. They have to be connected ac-
cordingly as described above (see page 22, Fig. 3).
6.3. Oil Chamber Seal Condition Sensors
Upon request, the 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
1
.
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
1
and S
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 to 100 k
Ω
, standard setting is approx.
50 k
Ω
.
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.