NOCCHI SENSORMAT Manual De Uso página 23

- units with pilot pump
The pilot pump starts first; it is stopped after the starting of the first service pump and is started again after the last
service pump.
If the cyclical reversal has been disabled (see chap. 7 - variation of operational parameters) the pumps are started
and stopped in sequence.
WARNING
A) Calibration of the pressure switches mod. PY 06 (refer to Fig. 7)
- tighten almost to the maximum screw A of the pressure switch.
- unscrew almost totally screw B of the pressure switch
- close all the points of collection and bring the plant to the maximum pressure by manual use of pump
- stop the pump and leave the switchboard predisposed for MANUAL operation
with the pumps stopped.
- open a point of collection and close it when the circuit pressure has reached the
level which we intend to assign to the first pump
- tighten screw B of the pressure switch n.1 to the point where its electric contact closes
- manually use the pump to raise the network pressure and
bring it to the level that we want to assign to the first pump
- unscrew screw A to the point where the pressure switch n. 1 is opened
- repeat the operation on the other pressure switch
b) Calibration of pressure switch mod. PM/5 and PM12 (refer to Fig. 8)
- tighten screw A of the pressure switch to half-way position
- unscrew screw B of the pressure switch
- close all the collection points and with a pump in MANUAL mode, slowly bring the discharge collector pressure up
to reach the opening of the pressure switch contact (OFF)
- open a small collector by bringing the pressure to the level (start pump) that we want to assign to pressure switch
n.1
- tighten screw B of pressure switch n.1 to the point where its electric contact closes (ON)
- with a pump in MANUAL mode, slowly bring the circuit pressure to the starting level (arrest pump) that we want to
assign to the first pump
- unscrew screw A to the point where pressure switch n. 1 opens
- repeat the operation on the other pressure switch
c) Calibration of pressure switch mod. XMP 12 (refer to Fig. 9)
- tighten screw A of the pressure switch to half-way position
- tighten screw B of the pressure switch to half-way position
- close all the connection points and with a pump in MANUAL mode, slowly bring the collector discharge pressure to
the opening level (stop/arrest pump) that we want to assign to pressure switch n.1 (the pressure switch contact must
be closed - ON -)
- unscrew screw B of pressure switch n. 1 to the point where its electric contact opens (OFF)
- open a small collection/connection and slowly bring the circuit pressure to the closing level (start pump) that we want
to assign to pressure switch n. 1
- unscrew screw A to the point where pressure switch n.1 closes
- repeat the operation on the other pressure switch
2) UNITS WITH ELECTRONIC PRESSURE SENSOR
WARNING
WARNING
Logic of cyclical reversal (with cyclical reversal enabled)
The values of initial and final pressures are inserted during manufacture and can be changed following the indications
given in chap. 7 - variations, parameters, operation
For correct calibration of the pressure switches the following operations
must be carried out exactly in the sequence reported
The values of pressure switch calibrations must be between the
minimum and maximum working pressure levels foreseen for the pump
used in the unit and reported on the plate applied to the pumps
themselves
The switchboard automatically reverses the starting order of the pump
each time a working schedule is terminated
GB
21