13
Explosion proof models (1 Ph and 3 Ph) have a set of
lock-out-device ends temperature sensors with a higher
switch-off temperature, connected to the motor cable, the
wires are marked T1 and T2.
They must be connected to the safety circuit of the control
box in order to provide a manual re-start, when the motor
cools. This can be done by switch-off the mains power
supply and switch on again after approx. 5 minutes.
Switch-off temperature of the sensors:
Motor
Stator
winding
Normal
T1+T3
Regulator
Stator
winding
Ex
T1+T2
Limiter
TP50
TP53
AM120/122…2pol 140°C
140°C
TP50
TP53
TP70
AM120/122…4pol 140°C
140°C
TP50
TP53
TP70
AM136…2pol 140°C
140°C
TP50
TP53
AM136…4pol 140°C
140°C
Information for the operation on a frequency
converter:
In case Ex-pumps are operated with a frequency con-
verter the temperature monitoring in the stator has to
made by a PTC resistor according to DIN 44082 (available
on request) as well as operated with a RL94/9/EG relay.
6.4. Oil Chamber Seal Condition Sensors
Upon request TP 50, TP 53 and TP 70 pumps are avail-
able with a moisture sensor device of the pump oil-
chamber. Two sensors S1/S2 measures the electrical re-
sistance of the oil in the chamber. The sensors must be
connected to a tripping unit in the control panel (electrode
relays). In case of water entering the chamber through the
shaft seals, the resistance will change. The tripping unit
should have an adjustable sensitivity of 0 to 100 k
Ω
, stan-
dard setting is approx. 50 k
Ω
. For explosion-proof models
there has to be an instrinsically-safe relay.
The tripping unit should have an ajustable sensitivity of 0
to 100 k
Ω
, standard setting is approx. 50 k
Ω
.
6.5. Check of Direction of Rotation
1 Ph-pumps do not require any check, as they always run
with the correct 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 wa-
ter) 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 control panel input. 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.
7. Installation
Pay attention to the maximum depth of immersion
(see pump label).
If the pump is installed in a sump, the sump opening
must be covered with a tread-safe cover after installation.
The operator has to prevent damage through the
flooding of rooms caused by defects of the pump through
the use of appropriate measures (e.g. installation of alarm
units, backup pump or like that).
7.1. Submerged Base Stand Installation
TP 50, TP 53 pumps have a base stand casted at the
pump housing. For TP 70 pumps a separate ring base
stand, which is available as an accessory must be fixed at
the bottom of the pump. Fix a 90° elbow to the pump dis-
charge. The pump may be installed with a flexible dis-
charge hose or a rigid pipe, non-return valve and isolating
valve. If a flexible hose is used, make sure that it does not
buckle.
Fix a rope or a chain to the pump handle and lower the
pump into the liquid. If the pump is installed on muddy
ground, support it on bricks to prevent it from sinking in.
7.2. Submerged Installation with auto-coupling
Permanent installation of the pumps can be done on a
stationary auto-coupling. The following instructions refer
to the use of the original HOMA system.
⇒
Place the auto-coupling base unit on the bottom of the
pit. Use a plumb line to fix the correct position of the
guide rail bracket on the inside of the pit cover. Drill
mounting holes and fasten the guide rail bracket provi-
sionally with 2 screws.
⇒
Put the auto-coupling base unit in the exact position and
fasten with expansion bolts to the pit bottom. If the bot-
tom is uneven, the base unit must be supported to be in
horizontal position.
⇒
Assemble the discharge pipe in accordance with the
generally accepted procedures and without exposing the
pipe to distortion or tension. Insert the guide rails in the
ring of the auto-coupling base and adjust the length of
the rails by cutting them accurately to the guide rail
bracket.
⇒
Unscrew the provisionally fastenend guide rail bracket, fit
it on top of the guide rails and fasten it to the pit cover.
Make sure that the guide rails do not have any axial play,
as this would cause noise during pump operation.
⇒
Clean out debris from the pit before lowering the pump
into operation position.
⇒
Fit the coupling flange at the discharge of the pump.
Make sure that the rubber profile-seal is properly fixed to
the flange and will not fall off when the pump is lowered
into the pit. Slide the guide bar of the coupling flange be-
tween the guide rails and lower the pump into the pit by
means of a chain secured to the pump handle. When the
pump reaches the auto-coupling base unit, it will auto-
matically connect tightly.
⇒
Hang up the end of the chain to a suitable hook at the
top of the pit.
⇒
Adjust the length of the motor cable, so that it is not
damaged during the pump operation. Make sure that the
cables are not sharply bent or pinched
