Alto Neptune 5, Руководство по обслуживанию, Страница: 23 / 61

4.
Function
Neptune_GB_Ver.2.0_10/03
Mounted with an 0680 nozzle and connected to a hose
of 10 m the machine is started with inactivated spray
gun.
: The pressure is building up until the unloader valve
opens and the microswitch B4 activates the timer ( ).
The pressure will rise a little more but will drop
immediately ( ). After 20 s in by-pass, the motor stops
( ). If the system is tight the pressure will remain. At
the same time the pressure
drops to zero
( - the dashed line).
: The spray handle is activated and the pressure
drops. The microswitch B4 closes and starts the motor.
The pressure drops a little more, but will build up until
the working pressure (approximately 165 bar in this
example) is reached ( ). As long as the spray handle
is activated and the nozzle is unchanged the pressure
is steady.
A
B
C
D
D
D
E
in the pump
There are four purposes of the Control Safety Block:
1. To secure the machine against an excess of pressure.
2. To ensure a quick start.
3. To reduce the pressure in the pump when in by-pass mode.
4. Allow regulation of water volume.
21.
Control Safety Block 2
.
A BC D E F
Diagram 4.1: Pressure development Neptune 7-63
Safety valve
Cut Off Pressure
By-pass pressure
Working pressure
Starting pressure
Pumpressure
B4
Point D
B2