Pressure Variator - Riello ENNE 1400 Montage- Und Bedienungsanleitung

PRESSURE VARIATOR

To calibrate cam 8):
➤ Remove gear-case 9), slacken screws 7), and act on screw 4) until required eccentricity is obtained.
➤ Turning screw 4) to the right (+ sign), eccentricity is increased, thus increasing the difference between nozzle miximum and mini-
mum delivery.
➤ Turning screw 4) to the left (- sign), eccentricity si reduced, thereby reducing the difference between nozzle maximum and mini-
mum delivery.
➤ Every variation of eccentricity may require a travel offset using nut and locknut 6).
NB:
➤ To obtain correct calibration, cam 8) must operate over the full travel range of the servomotor (20° - 130°): every variation of the
servomotor must be matched by a variation in pressure.
➤ Never give the variator piston a snug fit: stop ring 5) sets maximum travel.
➤ When the adjustment has been made, manually check that there is no Knocking between 20° and 130° and that maximum and
minimum pressures match pre-selected values as indicated on the graph Fig. 10.
➤ If, at maximum nozzle delivery (maximum return pressure), pressure oscillations are seen on pressure gauge 3), slightly reduce
pressure until the oscillations are eliminated.
1 Pressure switch fitting
2 Delivery pressure gauge
3 Return pressure gauge
4 Cam adjustment screw
5 Piston halt ring
6 Piston calibration nut and
locknut
7 Cam locking screws
8 Variable cam
9 Gear-case
S7969
9 GB
Fig. 11
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