The Gun Is Reopened When The Appliance Is Switched On - Kärcher HDS 7/12 M Service Manual

6.32.4 The gun is reopened when the appliance is switched on

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1 High pressure outlet (without pressure)
2 Manometer (without pressure)
3 Pressure retaining valve (closed)
4 Pump is running
5 Rotary knob
6 Overflow valve (closed)
7 Reduction bore
8 Pressure switch "OFF" (closed)
9 Water inlet
10 Motor contactors (K1) (closed)
11 Pressure switch "ON" (closed)
Note
The shown functions of the preessure switches and motor
contactor are for understanding purposes only.
In reality, the information from the two pressure switches is
transferred directly to the control electronics, which in turn
controls the motor contactor.
As soon as the gun is opened, the pressure that is locked
in between the pressure retaining valve and the gun es-
capes.
68
English 5.906-432.0 Rev. 00 (06/15)
2 3
24 Volt
4
The pressure switch "ON" closes, which in turn will close
the control circuit.
The motor contactor is actuated, closes the contacts, the
motor starts up and the pump rebuilds the working pres-
sure.
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