11.0 DAILY TANK AUTOMATIC FILLING SYSTEM
11.1 COMPONENTS
The system basically consists of:
- electric gear pump with by-pass, capacity 10 l/min, delivery head 50 m and suction head 5 m, single
phase asynchronous motor 0.25 kW - 230 V - 50 Hz
- alternative manual pump
- 1 manually-operated 1/2” three-way valve
- 1 manually-operated 1/2” valves
- electric on-off valve for the electric pump in-flow
- float switch for starting and stopping the pump, mounted on the daily tank
- control circuits with the possibility of manual control and visual alarm of minimum and maximum level
integrated with the generating set electric board.
11.2 ASSEMBLY AND CONNECTIONS
The pump unit is usually mounted on the generating set and therefore both the electrical connections to the
control board and the water connections to the daily tank are carried out in the factory.
Some connections, however, have to be carried out by the installer, following the table given below which gives
the data related to the connections to the storage tank:
POS
TYPE OF CONNECTION
MATERIALS
1
2
3
4
Electrical to the storage tank
Electrical for pump supply 230V Ph+N
Plumbing for suction side
Plumbing for tank overflow pipes
Cable 2 x 1.5 mm2
Cable 2 x 1.5 mm2 max distance 50m
Copper pipe, dia. 15
÷
20 mm or 1/2” galvanised
steel pipe
Copper pipe, dia. 25
÷
30 mm or 1” galvanised steel
pipe
All connections should be carried out in compliance with the enclosed wiring and plumbing diagrams and in compliance
with fire-prevention regulations in force and whatever is normally required by the local Fire Brigade.
The filling pump supply connection have to derived from the preferential line or, if it isn’t, from the user circuit.
See automatic filling system example in figure 11.1 and 11.2
11.3 OPERATION
Putting the pump operation switch to position “1 - AUTOMATIC” sets the circuit in conditions to start and stop the pump
in relation to the level of diesel fuel in the daily tank: i.e. when the level arrives at the height of the float SL3, the pump
starts and continues until the level reaches float SL4. If the pump does not start at level SL3, when the level falls at the
level SL2, the “LOW FUEL LEVEL” alarm is activated. If the level falls at the minimum level (float SL1), the “NO
FUEL” alarm is activated and the generating set stops to avoid the diesel fuel circuits from becoming empty. Similarly if
the pump does not stop at level SL4, it receives a further stop command when the fuel level rises to maximum (float SL5)
and a visual “MAXIMUM LEVEL” alarm is activated at the same time.
The pump is protected by a relay activated by the float SL6 mounted on the storage tank, which stops the pump at the
minimum level thus preventing it from working dry. The electric motor is protected by short circuit and overload with fuses
and a thermal relay, the activation of which is shown by the relative locking indicator light. Putting the switch to the
Metallwarenfabrik Gemmingen Telefon: 07267 / 806 193
Stromerzeuger
&
Telefax: 07267 / 806 198
Industriestr. 1 www.metalwarenfabrik.com
D – 75050 Gemmingen [email protected]
