Inhoudsopgave
Advertenties
Beschikbare talen
Beschikbare talen
Switch-off temperature of the sensors:
Motor
Stator winding
Normal
T1+T3
Regulator
AM420...
150°C
R-4pol
AM420...
150°C
R-6pol
AM420...
150°C
R-8pol
AM420...
150°C
R-10pol
Check of Direction of Rotation
On original HOMA control boxes a control-light is illu-
minated, 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 correct di-
rection of rotation is clockwise.
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
With bigger pumps the check may be done by watching
the rotation of the impeller through the discharge or suc-
tion inlet. Switch the pump on and off and check the direc-
tion of rotation when the impeller rotates slowly.
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!
Additional the direction of rotation can control by a "motor
& phase rotation indicator", which must put on the motor
housing of the operating pump.
Seal condition sensors at pumps with oil chamber
•
Models without cooling jacket or model „U" with
cooling jacket and open circuit cooling:
In case of water entering the oil chamber through the
shaft seals, the resistance will change. The electrical re-
sistance of the oil in the oil chamber is measured by 2 sen-
sors. The sensors must be connected by 2 wires (marked
S1 and S2) of the pump connecting cable in the control
panel with a tripping unit with galvanically separated safe-
ty circuit (electrode relay, e.g. HOMA part no.: 1610995).
For explosion-proof models an intrinsically-safe relay
(HOMA part no.: 1416510) must be used. The tripping
unit should have an adjustable sensitivity of 0 to 100 kΩ,
standard setting is approx. 50 kΩ.
38 | EngliSH
All manuals and user guides at all-guides.com
Stator
Lower
Upper
winding Ex
bearing
bearing
T1+T2
Limiter
150°C
90°C
105°C
150°C
90°C
105°C
150°C
90°C
105°C
150°C
90°C
105°C
ATTENTION
The start reaction is
anti clockwise
Cable connection seal condition sensors
The cable connecting chamber is controlled by two sen-
sors for entering of water. The sensors must be connect-
ed by 2 wires (marked S1 and S2) of the pump connecting
cable in the control panel with a tripping unit with galvan-
ically separated safety circuit (electrode relay, e.g. HOMA
part no.: 1610995).
For explosion-proof models an intrinsically-safe relay
(HOMA part no.: 1416510) must be used.
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.
3.3.5. Pump housing
The pump housing, depending on the model, is supplied
with different connections. This means that the machine
can be connected with the respective pipe system. The
pump housing is also available rubber-coated inside.
Some pump housings are supplied with a cleaning hole
lid to eliminate blockages. The pump can equipped with a
stationary wear ring which can be found in the intake port.
This wear ring determines the gap between the impeller
and the intake port. If this gap is too big, the performance
of the pump decreases and it can lead to blockages. The
rings can be changed to minimize wear and expenses for
spare parts.
3.3.6. Impeller
The impeller is fastened directly to the motor shaft and
driven by it. The impeller is also available in different ma-
terials (GG, GGG, VA, BZ) or coated with ceramic liquid.
A range of different impeller designs are available:
M:
Enclosed single channel impeller, for liquids containing
impurities and sludge with solid particles or long fibres.
K:
Enclosed multi channel impeller, for liquids containing
impurities and sludge with solid particles.
V:
Vortex impeller, for liquids containing a high level of impurities
or fibrous matter and containing gas.
Advertenties
Hoofdstukken
Inhoudsopgave
