OLIJU TRI CMV Notice D'installation page 13

10. Features
The system provides the following functions:
- Automatic control of the effect of pumps in
sequence through two pressure switches.
- Automatic switching the pump on any cycle start /
stop.
- If a pump is in a state of breakdown, it is
automatically removed from service.
- Manual reset state trip due to overload.
Pump protection and system:
- Protection against short circuit through the
breaker.
- Motor protection by means of a thermal relay.
- Protection against dry running through a pressure
switch or level switch added (not included in the
standard system).
- Delay between two pumps at startup: It prevents
starting simultaneously from more than one pump.
11. Pressure switches
The pressure stop, can not under any
circumstances, exceed the maximum
operating pressure of the pump and
tank membrane.
During installation and first start of the system
should be set off and the pressure differential of
each switch in order to configure the system to be
optimized.
- P +
+ ∆P-
Pic.4
Setting the pressure stop
To set the pressure stop (p ), proceed as follows:
1. Turn the screw P in the direction + to increase
the pressure stop, and direction - to decrease the
pressure stop, as indicated on the pressure switch.
See Pic. 4.
2. Set the stop pressure with a difference from 0.3
to 0.5 bar, respectively, in each pressure switch.
3. Proceed to start the pump and check, by reading
the gauge, if the pressures were obtained for each
desired stop pressure switch.
Setting the differential pressure
To set differential pressure (p ), turn the screw ∆P
in the direction + to increase the pressure
differential and in the direction - to decrease the
pressure differential, as indicated on the pressure
switch. The stop pressure remains unchanged.
See Pic. 4.
The pressure differential must be set to the same
value in all pressure switches.
NOTE: Reduce to a minimum differential pressure
can reduce the pressure variations in the system.
Start-up pressure
The pressure startup (p
automatically when you set the pressure
differential.
p = p – p
arranque paragem dif.
To verify that the boot pressure is desired, proceed
as follows:
1. Proceed to start the pump and check, by reading
the gauge, if the start and stop pressures taked it's
what you want.
2. Repeat the above procedures for setting up the
pressure to obtain the correct start and stop.
Adjustments of pressure preload tank
membrane
Once you determine the pump start pressure, the
pressure required to pre-load tank membrane can
be adjusted to approximately 90% of the pressure
pump start.
Preload pressure = 0.9 x pstart.
The preload of the tank must be checked / adjusted
when the discharge pipe is empty.
4
stop
dif.
) is configured
start