19
The external devices are comprised of:
- pressure pickup operating the pump (pressure switch or electronic sensor)
- pressure pickup for low pressure alarm (pressure bulb - autotest units)
- level detector (probes, floats, minimum pressure switch)
- acoustic alarm (electronic siren - autotest units)
- solenoid valve (for autotest units)
1) float switch
The float must be installed in the tank and connected thanks to two wires to the special terminals on the control board.
2) electronic control with probes
The three probes should be specially placed in the first collection deposit and should be then connected to terminals
inside the board. The COMMON probe must be installed at the lowest level in the tank and anyway always at a level
lower than the minimum level probe (
LOW
) that prevents from the working of the pilot pump when water descends
below this level. The maximum level probe (
HIGH
) allows again the working of the pilot pump when the water reaches
this level.
3) Inverted minimal pressure sensor
In the case where the group is fed by a water duct under pressure (for example municipal water system), it is
necessary to install a minimal pressure sensor which prevents from the working of the group if the pressure in the
duct descends below the preset value.
Chap.6 – Starting up
See fig.3-4-5-6-7-8 and diagrams in the distribution board.
Control of the direction of rotation of the pump with inverter drive.
Once all the hydraulic and electric connections have been done for the hydraulic priming of the pumps and collectors,
proceed as follows:
- close all the valves of the distribution system
- open all the valves of the group, included those of the membrane ways
- control the closing of the distribution board hatch
- place the power supply disconnector on I (ON)
DANGER
Risk of electrical
discharge
Warning: from this moment any operations on pump ducts, pressure
transducer, pressure sensor, etc. must be done after having cut the
voltage off from the distribution board.
Press key (11)
to enable MANUAL operation unit
M
A
GB
WARNING
Before connecting the power supply cable to the control board, check
that it has sufficient dimensions to support the maximum voltage
required by group pumps.
WARNING
The connection of the distribution boards to the power grid must be done
according to indications reported on the electric connection scheme
situated in the control board.
The substitution of electric and electronic components must to be done
by a skilled staff.
DANGER
Risk of electrical
discharge
WARNING
Our units are equipped with all the devices necessary for their
respective operations except for that of level control which must be
chosen and mounted during assembly
Protection against dry operation of the motor pumps (refer to fig. 4)
On the switchboard it is possible to connect to a device for tank level control
(our units are delivered with 26-27-
28 jump terminals)
WARNING
In this case the unit is not protected against dry operation. It is therefore
necessary to remove the electric bridges and connect them to the
control device selected
Summary of Contents for Nocchi Pressomat
Page 19: ...129 Fig 2 a...
Page 20: ...130 I Fig 2 b...
Page 21: ...131 Fig 3...
Page 22: ...132 Fig 5...
Page 23: ...133 Fig 4 Fig 6 Fig 7 Fig 8 Fig 9...
Page 24: ...134 Fig 10...
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