Homa KX...H series, Оригинальное руководство пользователя

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34 | EngliSH
They must be connected to the safety circuit of the con-
trol box in order to provide an automatic re-start of the
motor, when the motor cools.
The explosion-proof versions also have a temperature
sensor set of which, over the wire ends of T1 and so con-
nect T2 of the connecting cable is that triggered manual
reset through a special combination of contactor in the
switching device is required.
The temperature sensor kit must be connected in the s
ubstation that it switches off if it overheats.
Switch-off temperature of the sensors:
Motor Stator winding
Normal T1+T3
Regulator Stator winding
Ex T1+T2
Limiter Lower
bearing Upper
bearing
AM376…
H-4pol 150°C 150°C 90°C 105°C
AM376…
H-6pol 150°C 150°C 90°C 105°C
AM376…
H-8pol 150°C 150°C 90°C 105°C
Direction of Rotation Check
All pumps have the correct direction of rotation when con-
necting to a dextrorotatory field (U, V, W -> L1, L2, L3).
HOMA switching devices check the mains for a dextroro-
tatory field. If there is no dextrorotatory field, the red LED
lights up. Two phases are to be swapped at the input of
the switching device. For smaller pumps, the check can
be done by monitoring the starting jolt. Do do this, put
the pump carefully on the floor on its edge and switch
on briefly. Seen from above, the pump slightly jolts in the
correct anticlockwise direction.
The pump has the correct direction of rotation if the pump
moves anticlockwise, as the motor starts in the clockwise
direction when seen from above.
ST
AR
T
REACTION
ROTOR
REACTION
ATTENTION
The
direction of rotation
is correct if the
impeller/propeller rotates
in a clockwise manner
when viewing down from
top of the placed unit
ATTENTION
The
start reaction
is
anti clockwise
For large pumps, the direction of rotation can also be de-
tected by looking through the pressure joint into the pump
chamber. Here you will see the impeller and by briefly
switching on, check the direction of rotation by the coast-
ing of the impeller.
Beware of rotating impeller! The moving impeller can
crush and sever limbs. Never reach into the pump
unit or the moving parts during operation. Switch off
the machine and let the moving parts come to a rest
before maintenance or repair work!
It is also possible to check the direction of rotation with
a “Motor and Phase Rotation Indicator”. This measuring
device is held on the outside of the motor housing when
the pump is switched on and indicates the direction of
rotation with an LED.
Seal monitoring for pumps with oil chamber:
• Version without cooling jacket or “U” version with
cooling jacket and open cooling circuit:
If the shaft seal on the medium side leaks, water enters
the oil chamber and changes the resistance of the oil. The
conductivity of the oil added is monitored via 2 sensors.
The sensors should be connected via 2 wires (designated
S1 and S2) from the pump connecting cable in the con-
trol system to an evaluation unit with electrically isolat-
ed probe circuit. With the version for use in areas with a
potentially explosive atmosphere, select an electrode re-
lay with intrinsically safe circuit. The response sensitivity
should be adjustable from 0-100 k
Ω
; standard setting 50
k
Ω
. Appropriate relays can be purchased from HOMA.
Seal monitoring for pumps without oil chamber:
• Models with cooling jacket and closed (internal) cool-
ing circuit (model „L“):
A leakage chamber is controlled by two sensors for en-
tering of cooling liquid (liquid water/glycol). This leakage
chamber is placed between the upper (motor-side) shaft
seal and the bottom ball bearing. In case of cooling liq-
uid entering the leakage chamber through the upper shaft
seal, the sensors contact. The sensors must be connect-
ed by 2 wires (designated S11 and S12) of the pump
connecting cable in the control panel with a tripping unit
with galvanically separated safe circuit. An electrode relay
with intrinsically safe circuit must be selected for expo-
lion-proof models. The corresponding relays can be pur-
chased from HOMA.
The tripping unit should have an adjustable sensitivity of
0 to 100 k
Ω
, standard setting is approx. 50 k
Ω
. This sen-
sor-alarm monitors a leakage affecting the stator room of
the electric motor, which may result in a motor shortcut.
Therefore the motor control panel should automatically
switch off the motor, when this alarm appears.
Seal monitoring in the cable junction chamber:
The cable junction chamber is monitored for moisture
penetration via 2 sensors. The sensors should be con-
nected via 2 wires (designated S3 and S4) from the pump
connecting cable in the control system to an evaluation
unit with electrically isolated probe circuit. With the ver-
sion for use in areas with a potentially explosive atmo-
sphere, select an electrode relay with intrinsically safe
circuit. Appropriate relays can be purchased from HOMA.
Motor cooling
Motors for submerged operation are cooled by the sur-
rounding liquid.
3.3.4. Sealing
The sealing between pump and motor is carried out by
two separate mechanical shaft seals (silicon-carbide) in
tandem-arrangement. It is made of bearing cover and
pressure cover. It is filled with medical white oil. Separate
large oil chamber, lubricating and cooling the mechanical
seals, forming an extra safety and inspection element.